Land Rover & Range Rover Fault Code Index

OBD-II / EOBD Reference — 114 Codes — All Key Models — Last reviewed: April 2026

This index covers 114 OBD-II and EOBD fault codes commonly reported on Land Rover and Range Rover vehicles. Each entry includes the affected models, the most likely failure component, and a workshop note based on real-world diagnostic patterns. Use the model and system filters below to find codes relevant to your vehicle.

Key Takeaways

114 fault codes across 10 system categories, covering Defender, Discovery 3/4, Freelander 2, Range Rover, and Range Rover Sport.
EU-market diesel focus — 2.7 TDV6 (276DT), 3.0 TDV6/SDV6 (306DT), 2.2 TDCI, TD5, TDV8, and SD4 platforms prioritised.
Each code includes a likely failure component and a workshop insight note where applicable.
Filter by model using the buttons below, or browse by system using the section navigation.
Codes marked ★ are high-frequency, high-value fault codes with the highest search demand.
Always confirm with a live diagnostic scan before ordering parts. Code presence indicates a likely fault area, not a confirmed component failure.

Browse by Model

All Models Discovery 3 Discovery 4 Range Rover Sport Range Rover (L322) Range Rover (L405) Defender Freelander 2

Browse by System

Fuel System (19) Turbocharger & Air Intake (14) Air Suspension (14) Engine / Sensors / Timing (15) Electrical & Charging (6) CAN Bus & Network (10) Brakes & ABS (9) Emissions / EGR / DPF (12) Transmission & Gearbox (8) Cooling System (7)

No fault codes match this model filter in this section.

Fuel System

19 codes Shop Parts →

Code	Description	Severity	Affected Models	Model Tags	Likely Fault Component
P0087★	Fuel rail/system pressure too low Workshop NoteOn 306DT engines check HPFP drive belt condition before condemning the pump itself. Belt slip or snap is a common cause on this platform.	Critical	Discovery 3 (L319), Discovery 4 (L319), Range Rover Sport (L320), Defender 110/130 (2.4 TDCi)	L319L320276DT306DTTDCi	HPFP, fuel filter, fuel pressure regulator; 306DT: HPFP drive belt (rear of engine)
P0088	Fuel rail/system pressure too high Workshop NoteIf the regulator fails open, pressure overshoots. Confirm with live rail pressure data before part replacement.	Critical	Discovery 4 (L319), Range Rover (L322 TDV8), Range Rover Sport (L320)	L319L322L320TDV8306DT	Fuel pressure regulator, pressure relief valve
P0093	Fuel system large leak detected Workshop NoteInspect HP pipes and injector return rail for wet fuel before smoke testing. Physical inspection is faster on this code.	Critical	Discovery 3 (L319), Range Rover Sport (L320), Freelander 2 (L359)	L319L320L359276DTSD4eD4	Fuel injector return line, HP fuel pipe
P0094	Fuel system small leak detected Workshop NoteOften a weeping banjo bolt or cracked low-pressure pipe. Check connections at filter housing first.	Warning	Discovery 3 (L319), Discovery 4 (L319), Range Rover Sport (L320/L494)	L319L320L494276DT306DT	Fuel return banjo, low-pressure fuel pipe
P0190	Fuel rail pressure sensor circuit Workshop NoteCircuit fault; check wiring continuity and sensor connector before replacing sensor.	Warning	Discovery 3 (L319), Discovery 4 (L319), Freelander 2 (L359 2.2 TDCI)	L319L359276DT306DTTDCI	Fuel rail pressure sensor
P0191	Fuel rail pressure sensor range/performance Workshop NoteIntermittent signal; flex test wiring harness under live conditions before replacing sensor.	Warning	Defender TD5, Discovery 3 (L319 276DT), Discovery 4 (L319 306DT), Freelander 2 (L359 2.2 TDCI)	TD5L319L359276DT306DTTDCI	Fuel rail pressure sensor, wiring
P0192	Fuel rail pressure sensor circuit low Workshop NoteLow voltage signal; check 5V reference supply from ECU before condemning sensor.	Warning	All Land Rover diesel models	276DT306DTTD5TDCITDV8SD4	Fuel rail pressure sensor
P0193	Fuel rail pressure sensor circuit high Workshop NoteHigh voltage signal; open circuit in sensor wiring is the common cause.	Warning	All Land Rover diesel models	276DT306DTTD5TDCITDV8SD4	Fuel rail pressure sensor
P0090	Fuel pressure regulator control circuit Workshop NoteCheck wiring loom routing near hot components; chafing common on Defender.	Warning	Discovery 4 (L319 306DT), Range Rover Sport (L320), Defender 2.4 TDCi	L319L320306DTTDCi	Fuel pressure regulator, wiring loom
P0091	Fuel pressure regulator circuit low Workshop NoteLow-side circuit fault; confirm regulator resistance before ordering.	Warning	Discovery 3 (L319 276DT), Range Rover (L322 TDV8)	L319L322276DTTDV8	Fuel pressure regulator
P0001	Fuel volume regulator open circuit Workshop NoteValve is integral to the pump; an open circuit here often means the pump requires replacement.	Warning	Discovery 3 (L319 276DT), Range Rover (L322 TDV6)	L319L322276DT	Fuel volume control valve (on HPFP)
P0002	Fuel volume regulator range/performance Workshop NotePerformance fault; confirm with fuel trim and rail pressure data under load before replacing.	Warning	Discovery 3 (L319 276DT), Discovery 4 (L319 306DT), Range Rover (L322 3.0 TDV6)	L319L322276DT306DT	Fuel volume control valve
P0251	Injection pump fuel metering control A Workshop NoteFord-derived code reported on TD5 and early 276DT platforms. Confirm with SDD or equivalent.	Warning	Defender TD5, Discovery 3 early (L319 276DT)	TD5L319276DT	Injection pump metering valve
P0200	Injector circuit malfunction Workshop NoteGeneric injector circuit flag; run cylinder-specific codes to identify which injector before replacing.	Critical	All Land Rover diesel models	276DT306DTTD5TDCITDV8SD4eD4	Fuel injector, injector wiring
P0201	Injector circuit cylinder 1 Workshop NoteConfirm injector resistance and return volume test before replacement.	Critical	Defender TD5, Discovery 3 (L319 276DT), Freelander 2 (L359 2.2 TDCI)	TD5L319L359276DTTDCI	Cylinder 1 injector
P0202	Injector circuit cylinder 2 Workshop NoteReturn volume test cylinders together to identify the outlier.	Critical	Defender TD5, Discovery 3 (L319 276DT), Freelander 2 (L359 2.2 TDCI)	TD5L319L359276DTTDCI	Cylinder 2 injector
P0203	Injector circuit cylinder 3 Workshop NoteReturn volume test; confirm before ordering to avoid unnecessary replacement.	Critical	Defender TD5, Discovery 3 (L319 276DT), Freelander 2 (L359 2.2 TDCI)	TD5L319L359276DTTDCI	Cylinder 3 injector
P0204	Injector circuit cylinder 4 Workshop NoteOn 6-cylinder engines confirm it is not a wiring fault before removing injector.	Critical	All inline 4-cylinder and 6-cylinder diesel Land Rover models	TD5TDCI276DT306DTSD4eD4	Cylinder 4 injector
P1211	Injector control pressure above/below desired Workshop NoteFord-derived code confirmed reported on Defender TDCi. Check ICP sensor and its supply before pump diagnosis.	Warning	Defender TDCi, Discovery 3 early (L319 276DT)	TDCiL319276DT	ICP sensor, injection pump

Turbocharger & Air Intake

14 codes Shop Parts →

Code	Description	Severity	Affected Models	Model Tags	Likely Fault Component
P0299★	Turbocharger underboost condition Workshop NoteOn Discovery 3/4 the intercooler hose split is the first check before any other diagnosis. Inspect upper and lower hoses and all boost pipe clips under light pressure.	Critical	Discovery 3 (L319 276DT), Discovery 4 (L319 306DT), Range Rover Sport (L320), Defender 2.4 TDCi, Freelander 2 (L359 SD4)	L319L320L359276DT306DTTDCiSD4	Turbocharger, intercooler hose, boost actuator
P0234	Turbocharger overboost condition Workshop NoteConfirm boost pressure live data before condemning actuator. N75 solenoid is a lower-cost first test.	Critical	Discovery 3 (L319 276DT), Discovery 4 (L319 306DT), Range Rover (L322 TDV8), Freelander 2 (L359 2.2 TDCI)	L319L322L359276DT306DTTDV8TDCI	Boost solenoid, turbo actuator
P0235	Turbo boost sensor A circuit Workshop NoteCircuit fault; check wiring first. MAP sensor connector is a common failure point on high-mileage engines.	Warning	All Land Rover turbocharged diesel models	276DT306DTTDV8TDCiSD4eD4	MAP/boost pressure sensor
P0236	Turbo boost sensor A range/performance Workshop NotePerformance fault; cross-check boost reading against expected values under load.	Warning	Discovery 3 (L319 276DT), Discovery 4 (L319 306DT), Defender TDCi	L319276DT306DTTDCi	MAP/boost pressure sensor
P0238	Turbo boost sensor A circuit high Workshop NoteHigh voltage; check for chafed wiring or water ingress at sensor connector.	Warning	All TDV6 models (276DT/306DT)	276DT306DT	MAP/boost pressure sensor, wiring
P0045	Turbo boost control solenoid A open Workshop NoteOpen circuit; test solenoid resistance and operation with 12V bench test before fitting replacement.	Warning	Discovery 3 (L319 276DT), Discovery 4 (L319 306DT), Range Rover Sport (L320)	L319L320276DT306DT	Boost control solenoid (N75 equivalent)
P2263★	Turbo/supercharger system performance Workshop NoteOn 3.0 SDV6: check secondary turbo isolation valve sticky linkage and vacuum actuator before any turbo replacement. This is the most common cause on that platform.	Warning	Discovery 4 (L319 306DT), Range Rover Sport (L320/L494), Freelander 2 (L359 SD4), Range Rover (L405 SDV6)	L319L320L359L405L494306DTSDV6SD4	Secondary turbo isolation valve (SDV6); VNT vanes, boost pipes (TDV6)
P2563	Turbocharger actuator position sensor Workshop NotePosition sensor is integrated with the actuator on most fitments; confirm sensor signal before replacing actuator.	Warning	Discovery 4 (L319 306DT), Range Rover Sport (L494), Freelander 2 (L359 SD4)	L319L359L494306DTSD4	VNT actuator, turbo position sensor
P003A	Turbocharger B position sensor range Workshop NoteTwin-turbo platform only. Confirm which turbo is flagging before diagnosis.	Warning	Range Rover (L405 3.0 TDV6 twin-turbo), Discovery 4 (L319 SDV6)	L405L319306DTSDV6	Secondary turbo actuator sensor
P0101	MAF sensor range/performance Workshop NoteCheck air filter condition and intake ducting for splits before replacing MAF. A dirty filter alone can trigger this code.	Warning	All Land Rover diesel and petrol models	276DT306DTTD5TDCiTDV8SD4V8	Mass airflow sensor, air filter, intake ducting
P0100	MAF sensor circuit malfunction Workshop NoteCircuit fault; check sensor connector and wiring before ordering sensor.	Warning	All Land Rover models	276DT306DTTD5TDCiTDV8SD4V8	MAF sensor, wiring
P00BD	MAF airflow range/performance bank 1 Workshop NoteCheck for unmetered air between MAF and throttle body before replacing sensor.	Warning	Discovery 4 (L319 306DT), Range Rover Sport (L494), Range Rover (L405)	L319L405L494306DT	MAF sensor, intake air leak
P0102	MAF sensor circuit low Workshop NoteLow-signal fault; check 5V reference and earth continuity at sensor.	Warning	All Land Rover models	276DT306DTTD5TDCiTDV8SD4V8	MAF sensor, wiring
P0103	MAF sensor circuit high Workshop NoteHigh-signal fault; often caused by open circuit in signal wire.	Warning	All Land Rover models	276DT306DTTD5TDCiTDV8SD4V8	MAF sensor, wiring

Air Suspension

14 codes Shop Parts →

Code	Description	Severity	Affected Models	Model Tags	Likely Fault Component
C1A00★	Air suspension compressor performance fault Workshop NoteAMK vs Hitachi compressor: JLR changed supplier during production. If replacing the compressor and the brand changes, a software flash via SDD may be required. Confirm current fitment before ordering.	Critical	Range Rover (L322), Range Rover (L405), Range Rover Sport (L320/L494), Discovery 3 (L319), Discovery 4 (L319)	L319L320L322L405L494	Air compressor, relay, dryer
C1A01	Air suspension compressor circuit fault Workshop NoteCheck relay and supply fuse before condemning compressor. Relay failure is common and inexpensive.	Critical	Range Rover Sport (L320), Discovery 3 (L319), Discovery 4 (L319)	L319L320	Compressor, wiring, relay
C1A07	Height sensor fault front left Workshop NoteInspect linkage arm for corrosion and seized pivot before replacing sensor. Linkage failure is as common as sensor failure.	Warning	All Land Rover air suspension models	L319L320L322L405L494	Front left height sensor, sensor linkage arm
C1A08	Height sensor fault front right Workshop NoteSame inspection procedure as C1A07; check both sides together.	Warning	All Land Rover air suspension models	L319L320L322L405L494	Front right height sensor, sensor linkage arm
C1A09	Height sensor fault rear left Workshop NoteRear linkage arms are more exposed to road debris; check for physical damage first.	Warning	All Land Rover air suspension models	L319L320L322L405L494	Rear left height sensor, sensor linkage arm
C1A0A	Height sensor fault rear right Workshop NoteCheck both rear sensors together; replace as a pair if one has failed due to age.	Warning	All Land Rover air suspension models	L319L320L322L405L494	Rear right height sensor, sensor linkage arm
C1A15★	Air suspension valve block fault Workshop NoteInternal valve block solenoids are not serviceable individually on L322/L319. Full valve block replacement is the standard repair.	Critical	Range Rover (L322), Discovery 3 (L319), Discovery 4 (L319), Range Rover Sport (L320)	L319L320L322	Valve block assembly
C1A13	Reservoir pressure static not building Workshop NoteCheck one-way valve between compressor and reservoir before condemning compressor. A failed check valve prevents reservoir from holding pressure.	Critical	Range Rover (L322), Range Rover (L405), Discovery 4 (L319)	L319L322L405	Reservoir tank, check valve, compressor
C1A20	Pressure increases too slowly Workshop NoteSoap test all pipe unions and spring bladder collars before replacing compressor. A slow fill is more often a small leak than a worn compressor.	Warning	Range Rover (L405), Range Rover Sport (L494), Discovery 4 (L319)	L319L405L494306DT	Air spring bladder, pipe/union leak, compressor wear
C1A36	Pressure sensor fault Workshop NoteSensor is integrated into the valve block on L405/L494. Confirm sensor fault with live data before replacing the valve block assembly.	Warning	Range Rover (L405), Range Rover Sport (L494)	L405L494	Pressure sensor (within valve block assembly)
C1A44	Corner fill time excessive rear left Workshop NoteSlow corner fill; physically inspect rear left air spring for cracking or bladder delamination. Cold-weather failures are common.	Warning	Range Rover (L405), Discovery 4 (L319)	L319L405	Rear left air spring, pipe leaks
C1A45	Corner fill time excessive rear right Workshop NoteInspect rear right spring in tandem with rear left; replace in pairs where possible.	Warning	Range Rover (L405), Discovery 4 (L319)	L319L405	Rear right air spring, pipe leaks
C1A46	Corner fill time excessive front left Workshop NoteFront springs are under higher load cycles; inspect for bladder cracking at the fold line.	Warning	Range Rover (L405), Range Rover Sport (L494)	L405L494	Front left air spring, corner valve
C1A47	Corner fill time excessive front right Workshop NoteInspect front right spring alongside front left. Front spring pairs should be replaced together.	Warning	Range Rover (L405), Range Rover Sport (L494)	L405L494	Front right air spring, corner valve

Engine / Sensors / Timing

15 codes Shop Parts →

Code	Description	Severity	Affected Models	Model Tags	Likely Fault Component
P0300★	Random/multiple cylinder misfire Workshop NoteRun P0087 diagnosis in parallel. Low fuel rail pressure is a frequent root cause of multi-cylinder misfire on these platforms.	Critical	Discovery 3 (L319 276DT), Discovery 4 (L319 306DT), Range Rover (L322 TDV8), Range Rover (L322 4.4 TDV8)	L319L322276DT306DTTDV8	Injectors, glow plugs; cross-check fuel rail pressure
P0301	Cylinder 1 misfire Workshop NoteCylinder-specific; run return volume test and glow plug resistance check before removal.	Critical	All Land Rover models	276DT306DTTD5TDCITDV8V8SD4	Injector, glow plug, compression
P0302	Cylinder 2 misfire Workshop NoteReturn volume test to isolate.	Critical	All Land Rover models	276DT306DTTD5TDCITDV8V8SD4	Injector, glow plug
P0303	Cylinder 3 misfire Workshop NoteReturn volume test to isolate.	Critical	All Land Rover models	276DT306DTTD5TDCITDV8V8SD4	Injector, glow plug
P0304	Cylinder 4 misfire Workshop NoteOn 6-cylinder engines confirm cylinder numbering convention before diagnosis.	Critical	All inline Land Rover engines	276DT306DTTD5TDCITDV8SD4	Injector, glow plug
P0335	Crankshaft position sensor A circuit Workshop NoteNo crank signal means no start. Confirm sensor air gap and reluctor ring condition before replacing sensor.	Critical	All Land Rover models	276DT306DTTD5TDCITDV8V8SD4	Crankshaft position sensor
P0336	Crankshaft position sensor A range Workshop NoteIntermittent signal; check reluctor ring for missing or damaged teeth before replacing sensor.	Warning	Discovery 3 (L319 276DT), Discovery 4 (L319 306DT), Freelander 2 (L359 2.2 TDCI)	L319L359276DT306DTTDCI	Crankshaft position sensor, reluctor ring
P0340	Camshaft position sensor A circuit Workshop NoteCircuit fault; check connector and wiring. CMP sensor failure on TD5 can cause no-start.	Warning	Defender TD5, Discovery 3 (L319 276DT), Freelander 2 (L359 2.2)	TD5L319L359276DTTDCI	Camshaft position sensor
P0341	Camshaft position sensor A range Workshop NoteConfirm signal pattern on oscilloscope if intermittent; tone ring damage is a secondary cause.	Warning	Discovery 3 (L319 276DT), Discovery 4 (L319 306DT)	L319276DT306DT	Camshaft sensor, tone ring
P0380★	Glow plug circuit A malfunction Workshop NoteTest individual glow plug resistance (should be below 2 ohm). Relay failure is common and should be tested first.	Warning	All Land Rover diesel models	276DT306DTTD5TDCITDV8SD4eD4	Glow plug relay, glow plugs
P0381	Glow plug indicator circuit Workshop NoteIndicator circuit only; engine may start and run normally. Confirm control module before replacing.	Minor	Defender TD5, Discovery 3 (L319 276DT), Discovery 4 (L319 306DT)	TD5L319276DT306DT	Glow plug control module
P0606	ECM/PCM processor fault Workshop NoteConfirm supply voltage and earth quality to ECU before condemning. Low voltage and poor earths commonly trigger this code.	Critical	All Land Rover models	276DT306DTTD5TDCITDV8V8SD4	ECU/ECM unit
P0611	Fuel injector control module performance Workshop NoteIDM is a separate module on these platforms. Confirm module supply and earth before replacement.	Critical	Discovery 3 (L319 276DT), Discovery 4 (L319 306DT), Range Rover (L322 TDV6)	L319L322276DT306DT	Injector driver module (IDM)
P0642	Sensor reference voltage A circuit low Workshop NoteA failing 5V reference can trigger multiple simultaneous sensor codes. Identify all codes first; if multiple sensors flag together, trace the common reference circuit.	Warning	All Land Rover models	276DT306DTTD5TDCITDV8SD4	ECU, sensor wiring, 5V reference circuit
P0650	MIL engine management lamp circuit Workshop NoteCircuit fault only; does not indicate engine condition. Confirm bulb and BCM wiring before further diagnosis.	Minor	All Land Rover models	276DT306DTTD5TDCITDV8SD4V8	MIL bulb, BCM, wiring

Electrical & Charging

6 codes Shop Parts →

Code	Description	Severity	Affected Models	Model Tags	Likely Fault Component
P0560	System voltage malfunction Workshop NoteCheck main earth strap condition at battery and bodywork before testing alternator. Poor earth is the most common cause.	Warning	All Land Rover models	276DT306DTTD5TDCITDV8SD4V8	Battery, alternator, main earth strap
P0562	System voltage low Workshop NoteTest battery under load before testing alternator. A weak battery will trigger this code even with a healthy alternator.	Warning	All Land Rover models	276DT306DTTD5TDCITDV8SD4V8	Battery, alternator
P0563	System voltage high Workshop NoteOvervoltage condition; confirm alternator output before condemning regulator.	Warning	All Land Rover models	276DT306DTTD5TDCITDV8SD4V8	Voltage regulator, alternator
P0620	Generator control circuit malfunction Workshop NoteCheck alternator excitation wire condition; common chafing point near exhaust on Defender.	Warning	Discovery 3 (L319 276DT), Defender TD5, Defender TDCi	L319TD5TDCi276DT	Alternator, charge control wiring
P0625	Generator field terminal circuit low Workshop NoteLow-side circuit; confirm field winding resistance before replacing alternator.	Warning	All Land Rover models	276DT306DTTD5TDCITDV8SD4V8	Alternator field winding, wiring
B1A18★	Battery monitoring sensor circuit fault Workshop NoteIBS is clipped to the negative battery terminal. Common fault on L405 platform. Confirm with live IBS data before replacing battery.	Warning	Range Rover (L405), Discovery 4 (L319), Discovery 5 (L462), Range Rover Sport (L494)	L319L405L462L494	IBS (intelligent battery sensor) on negative terminal

CAN Bus & Network

10 codes Shop Parts →

Code	Description	Severity	Affected Models	Model Tags	Likely Fault Component
U0001★	High speed CAN bus communication fault Workshop NoteOften triggered by low system voltage rather than physical CAN failure. Check battery and P0562/B1A18 first. If voltage is good, run full system scan to identify which module is dropping off the bus.	Critical	All Land Rover models	276DT306DTTD5TDCITDV8SD4V8L319L320L322L405	CAN bus wiring, module, battery voltage
U0100	Lost communication with ECM/PCM Workshop NoteCheck ECM supply voltage and earth before CAN wiring diagnosis.	Critical	All Land Rover models	276DT306DTTD5TDCITDV8SD4V8	ECM, CAN wiring
U0101	Lost communication with TCM Workshop NoteConfirm TCM supply fuse and earth first. TCM location varies by model.	Critical	All Land Rover automatic models	276DT306DTTDV8SD4L319L320L322L405	TCM, CAN bus wiring
U0121	Lost communication with ABS module Workshop NoteCheck ABS module fuse and supply before CAN wiring diagnosis.	Critical	All Land Rover models	276DT306DTTD5TDCITDV8SD4V8	ABS module, CAN wiring
U0140	Lost communication with body control module Workshop NoteBCM controls numerous comfort and lighting functions; loss of comms often causes multiple simultaneous warning lights.	Warning	All Land Rover models	276DT306DTTD5TDCITDV8SD4V8	BCM, wiring
U0155	Lost communication with instrument cluster Workshop NoteInstrument cluster on L322 is a known failure point; confirm CAN continuity before replacing cluster.	Warning	Discovery 3 (L319), Discovery 4 (L319), Range Rover (L322)	L319L322276DT306DT	Instrument pack, CAN wiring
U0401	Invalid data received from ECM/PCM Workshop NoteInvalid data code; ECM is on the bus but sending corrupt data. Check ECM supply voltage and software version.	Warning	Discovery 4 (L319 306DT), Range Rover Sport (L494)	L319L494306DT	ECM, CAN node fault
U0416	Invalid data from vehicle dynamics module Workshop NoteConfirm module is not water damaged before condemning. L405 and L494 VDC modules are located in areas prone to water ingress.	Warning	Discovery 4 (L319 306DT), Range Rover (L405), Range Rover Sport (L494)	L319L405L494306DT	VDC module, CAN wiring
U3000	Control module internal fault Workshop NoteGeneric code; always identify which module via full system scan. Supply voltage fault is the most common trigger before module condemnation.	Critical	Discovery 3 (L319), Discovery 4 (L319), Range Rover (L322/L405)	L319L322L405276DT306DT	Relevant control module, supply voltage
U0126	Lost communication steering angle sensor Workshop NoteSAS must be calibrated after any steering or suspension work. Lost comms can follow recalibration failure.	Warning	Discovery 3 (L319), Discovery 4 (L319), Range Rover Sport (L320)	L319L320276DT306DT	SAS module, CAN wiring

Brakes & ABS

9 codes Shop Parts →

Code	Description	Severity	Affected Models	Model Tags	Likely Fault Component
C0031	Left front wheel speed sensor circuit Workshop NoteInspect sensor wiring loom for chafing at the wheel arch before replacing sensor. ABS ring corrosion is common on vehicles over 8 years old.	Critical	All Land Rover models	276DT306DTTD5TDCITDV8SD4V8	Wheel speed sensor, tone ring, wiring
C0034	Right front wheel speed sensor circuit Workshop NoteSame inspection procedure as C0031; check both front sensors at the same time.	Critical	All Land Rover models	276DT306DTTD5TDCITDV8SD4V8	Wheel speed sensor, wiring
C0037	Left rear wheel speed sensor circuit Workshop NoteRear wheel speed sensors are more exposed to mud and water; clean before testing.	Critical	All Land Rover models	276DT306DTTD5TDCITDV8SD4V8	Wheel speed sensor, tone ring
C0040	Right rear wheel speed sensor circuit Workshop NoteReplace in pairs if both rears are original and high mileage.	Critical	All Land Rover models	276DT306DTTD5TDCITDV8SD4V8	Wheel speed sensor, wiring
C0110	ABS pump motor circuit malfunction Workshop NoteConfirm motor supply fuse and relay before condemning pump. Motor unit can be replaced separately on some fitments.	Critical	Discovery 3 (L319), Discovery 4 (L319), Range Rover Sport (L320)	L319L320276DT306DT	ABS pump/motor unit
C0265	ABS/EBCM relay voltage malfunction Workshop NoteCheck relay and fuse first; relay failure is inexpensive and a common cause on high-mileage vehicles.	Critical	All Land Rover models	276DT306DTTD5TDCITDV8SD4V8	ABS relay, wiring, ABS module
C1095	ABS hydraulic pump motor circuit Workshop NotePump assembly is a known failure on L322 and early L319. Rebuilt units are available as a cost alternative.	Critical	Range Rover (L322), Discovery 3 (L319)	L319L322276DT	ABS pump assembly
C0045	Left rear ABS solenoid circuit Workshop NoteSolenoid is integral to ABS modulator on most fitments. Confirm fault is not wiring before condemning modulator.	Warning	All Land Rover models	276DT306DTTD5TDCITDV8SD4V8	ABS solenoid valve
C0050	Right rear ABS solenoid circuit Workshop NoteSame as C0045; check both rear solenoid circuits together.	Warning	All Land Rover models	276DT306DTTD5TDCITDV8SD4V8	ABS solenoid valve

Emissions / EGR / DPF

12 codes Shop Parts →

Code	Description	Severity	Affected Models	Model Tags	Likely Fault Component
P0400	EGR flow malfunction Workshop NoteGeneric EGR flow fault; inspect valve for carbon build-up before testing flow rate.	Warning	Freelander 2 (L359 2.2 eD4/SD4), Discovery 3 (L319 276DT), Discovery 4 (L319 306DT)	L319L359276DT306DTSD4eD4	EGR valve, EGR cooler
P0401★	EGR flow insufficient Workshop NoteCarbon blockage of EGR valve is the primary cause on 2.2 TDCI and TDV6 platforms. Clean or replace valve; also inspect intake manifold for carbon restriction.	Warning	Freelander 2 (L359 2.2 eD4/SD4), Discovery 3 (L319 276DT), Discovery 4 (L319 306DT), Range Rover Sport (L320)	L319L320L359276DT306DTSD4eD4	EGR valve (carbon-blocked), EGR cooler
P0402	EGR flow excessive Workshop NoteValve stuck open causes excess EGR at idle. Confirm with live EGR position data.	Warning	Discovery 3 (L319 276DT), Range Rover Sport (L320)	L319L320276DT	EGR valve stuck open
P0404	EGR circuit range/performance Workshop NotePosition sensor signal mismatch; check sensor and valve together before replacing either.	Warning	Freelander 2 (L359 2.2 eD4/SD4), Discovery 4 (L319 306DT)	L319L359306DTSD4eD4	EGR valve, position sensor
P0405	EGR sensor A circuit low Workshop NoteLow-side signal; check 5V reference and earth at sensor connector.	Warning	All EU-market Land Rover diesel models	276DT306DTTDCiSD4eD4	EGR position sensor
P0406	EGR sensor A circuit high Workshop NoteOpen circuit in signal wire is the common cause.	Warning	All EU-market Land Rover diesel models	276DT306DTTDCiSD4eD4	EGR position sensor
P2002★	DPF efficiency below threshold bank 1 Workshop NoteCRITICAL: Failed DPF regeneration cycles cause fuel-into-sump oil dilution on JLR diesels. Always check oil level and condition. An oil service is required alongside any DPF repair on these platforms.	Warning	All Euro 5 and Euro 6 Land Rover diesel models	276DT306DTTDCiSD4eD4	DPF filter, lambda/NOx sensor
P2003	DPF efficiency below threshold bank 2 Workshop NoteBank 2 code on V-engine platforms only. Oil dilution risk applies equally to both banks.	Warning	Range Rover (L322 TDV8 3.6/4.4), Range Rover Sport (L320 TDV8), Discovery 4 (L319 SDV6)	L319L320L322TDV8SDV6	DPF filter; oil dilution risk applies here also
P2453	DPF differential pressure sensor circuit Workshop NoteCheck sensor pipes for blockage or disconnection before replacing sensor. Blocked pipes are as common as sensor failure.	Warning	Discovery 4 (L319 306DT), Range Rover (L405), Freelander 2 (L359 SD4)	L319L359L405306DTSD4	DPF pressure sensor, sensor pipes
P2454	DPF pressure sensor circuit low Workshop NoteLow-side signal; check sensor supply and wiring before replacing.	Warning	All Euro 5 Land Rover diesel models	276DT306DTTDCiSD4eD4	DPF pressure sensor
P242F★	DPF restriction ash accumulation Workshop NoteAsh accumulation is end-of-life blockage that cannot be cleared by regeneration. Filter replacement required. Confirm oil is not fuel-diluted before fitting new filter.	Warning	Discovery 4 (L319 306DT), Range Rover Sport (L320/L494), Defender 2.4/2.2 TDCi	L319L320L494TDCi306DT	DPF filter (ash-blocked); check oil condition for fuel dilution
P2459	DPF regeneration frequency too high Workshop NoteFrequent regen requests indicate a partially blocked DPF or a fault in the regen trigger logic. Check post-injection fuel delivery.	Warning	Freelander 2 (L359 SD4), Discovery 4 (L319 306DT)	L319L359306DTSD4	DPF, fuel injector post-injection circuit

Transmission & Gearbox

8 codes Shop Parts →

Code	Description	Severity	Affected Models	Model Tags	Likely Fault Component
P0700★	Transmission control system malfunction Workshop NoteGeneric transmission flag. Always run TCM sub-scan for specific solenoid or pressure codes before any mechanical diagnosis.	Warning	All Land Rover automatic models (ZF 6HP / ZF 8HP)	276DT306DTTDV8SDV6V8L319L320L322L405	TCM, solenoid pack
P0705	Transmission range sensor circuit Workshop NoteGear position sensor; failure can cause incorrect gear display and limp mode. Confirm with live selector data.	Warning	ZF 6HP26 (L319/L320/L322), ZF 8HP45/70 (L405/L494)	L319L320L322L405L494	PRNDL position sensor
P0710	Transmission fluid temp sensor circuit Workshop NoteSensor is in the transmission pan on ZF units. Confirm ATF level and condition before sensor diagnosis.	Warning	Discovery 3 (L319), Discovery 4 (L319), Range Rover Sport (L320)	L319L320276DT306DT	Fluid temp sensor (in sump pan)
P0715	Input/turbine speed sensor circuit Workshop NoteSpeed sensor inside transmission. Confirm fault with live speed data before internal access.	Warning	All Land Rover ZF automatic models	L319L320L322L405L494	Input speed sensor
P0730	Incorrect gear ratio Workshop NoteCheck ATF level and condition first. Incorrect gear ratio is often caused by degraded fluid before mechanical wear.	Warning	ZF 6HP26 auto, Discovery 4 (L319), Range Rover (L322)	L319L322276DT306DT	Solenoid pack, clutch packs, ATF condition
P0740	Torque converter clutch circuit Workshop NoteTCC solenoid is part of the valve body on ZF units. Confirm solenoid operation before condemning torque converter.	Warning	All Land Rover ZF automatic models	L319L320L322L405L494	TCC solenoid, torque converter
P0750	Shift solenoid A malfunction Workshop NoteSolenoid A is accessible with valve body removal on ZF 6HP. Confirm fault with solenoid resistance test.	Warning	Discovery 3 (L319), Discovery 4 (L319), Range Rover Sport (L320)	L319L320276DT306DT	Shift solenoid A
P0796	Pressure control solenoid C performance Workshop NoteSolenoid is in the valve body. ATF quality has a direct effect on solenoid performance; confirm fluid condition first.	Warning	ZF 6HP (Range Rover L322, Range Rover L405)	L322L405	Pressure control solenoid C

Cooling System

7 codes Shop Parts →

Code	Description	Severity	Affected Models	Model Tags	Likely Fault Component
P0115	Engine coolant temp sensor circuit Workshop NoteCheck connector condition before replacing sensor; corrosion at ECT connector is common on older models.	Warning	All Land Rover models	276DT306DTTD5TDCITDV8SD4V8	Coolant temp sensor (ECT)
P0116	Coolant temp sensor range/performance Workshop NotePerformance fault; confirm slow warm-up symptom which also indicates thermostat failure.	Warning	Discovery 3 (L319 276DT), Discovery 4 (L319 306DT), Defender TD5, Freelander 2 (L359 2.2 TDCI)	L319L359TD5276DT306DTTDCI	Coolant temp sensor
P0117	Coolant temp sensor circuit low Workshop NoteLow-side signal; check 5V reference supply at sensor.	Warning	All Land Rover diesel models	276DT306DTTD5TDCITDV8SD4	Coolant temp sensor, wiring
P0118	Coolant temp sensor circuit high Workshop NoteHigh-side signal; open circuit in sensor wiring or failed sensor.	Warning	All Land Rover models	276DT306DTTD5TDCITDV8SD4V8	Coolant temp sensor, wiring
P0128★	Coolant thermostat below regulating temp Workshop NoteThermostat failure is a frequently reported fault on Freelander 2 2.2 platforms. Engine never reaches full operating temperature. Replace thermostat with housing as an assembly on 2.2 TDCI.	Warning	Freelander 2 (L359 2.2 eD4/SD4), Discovery 3 (L319 276DT), Discovery 4 (L319 306DT), Defender TDCi	L319L359TDCi276DT306DTSD4eD4	Thermostat
P0217	Engine coolant overtemperature condition Workshop NoteStop driving immediately. Check coolant level, fan operation, and thermostat before further diagnosis.	Critical	All Land Rover models	276DT306DTTD5TDCITDV8SD4V8	Cooling fan, thermostat, water pump
P1285	Engine overtemperature condition Workshop NoteStop driving immediately. On TDV6 engines check EGR cooler for internal failure which can introduce coolant loss without external leak.	Critical	Discovery 3 (L319 276DT), Discovery 4 (L319 306DT), Range Rover (L322 V8), Defender TD5	L319L322TD5276DT306DTV8	Thermostat, water pump, EGR cooler

Dataset note: Fault code descriptions follow OBD-II/EOBD standards. Model applicability reflects commonly reported real-world patterns sourced from published workshop data, technical service bulletins, and specialist community records. Always confirm with a live diagnostic scan before purchasing parts. Code presence indicates a probable fault area; it does not confirm a specific component failure.

Compiled by the roverparts.eu technical team. Last reviewed: April 2026. © roverparts.eu — Netherlands-based Land Rover & Range Rover parts specialist, supplying customers across the EU.

Frequently Asked Questions

What causes P2002 on a Land Rover or Range Rover?

P2002 means the diesel particulate filter is no longer trapping soot efficiently. The most common cause on JLR diesel platforms is a DPF blocked by repeated failed regeneration cycles, typically from short journeys that prevent the exhaust reaching regeneration temperature. Before replacing the DPF, check the oil dipstick for a rising oil level, which is the clearest symptom of fuel draining into the sump during failed regenerations. A new filter fitted over contaminated oil will fail again quickly.

What causes P00Q6 on a Land Rover Discovery 4?

P00Q6 indicates a fault with the secondary turbocharger control valve on the Discovery 4 with the 3.0 SDV6 306DT engine. This engine uses a two-stage turbo system where a solenoid-operated valve controls when the secondary turbo comes online. The valve itself sticks or fails due to carbon build-up or vacuum line deterioration, and this is the first component to inspect. A failed secondary turbo valve is frequently misdiagnosed as full turbocharger failure, making it one of the most commercially significant diagnostic errors on this platform.

What causes C1A20 on a Land Rover Discovery 4?

C1A20 means the air suspension system is taking longer than expected to build pressure in a corner. On the Discovery 4, the most common cause is a slow leak at an air spring bladder, a pipe union, or the valve block rather than a failing compressor. Before replacing the compressor, soap test all pipe connections and inspect the air spring collars for cracking. Also check the air dryer inside the compressor unit, as the desiccant beads can deteriorate into powder and restrict airflow, causing a slow build with no visible leak present.

What causes P0171 and P0174 on a Range Rover P38 or Range Rover V8?

P0171 and P0174 indicate the engine is running lean on bank 1 and bank 2 respectively. On the Range Rover P38 and L322 with the 4.0 or 4.6 V8, the most common cause is a failing mass airflow sensor, which causes the ECU to underestimate the volume of air entering the engine. Vacuum leaks from deteriorated intake hoses are the second most common cause on high-mileage V8 engines. Both codes appearing together almost always points to the MAF sensor rather than a fuel delivery fault.

What causes C1A00 on a Land Rover or Range Rover?

C1A00 indicates the air suspension compressor is not performing within specification. The compressor itself is the most common failure, but before ordering a replacement, check the relay and supply fuse, as relay failure is inexpensive and frequently overlooked. On Range Rover L322 and Discovery 3/4 platforms, JLR changed the compressor supplier from Hitachi to AMK during production. If the replacement brand differs from the original fitment, a software recalibration via SDD diagnostic tool is required to prevent the system rejecting the new unit.