AUTO MODULELAB
DTC FIX-PATH LOOKUP

Diagnostic Trouble Codes

Real-world meaning, causes, symptoms, and the bench-programming fix path — for the 30 codes we see most in our Arlington workshop.

Tip: Ctrl+F this page for your code (e.g. P1570).

BMW codes

20 codes

P1570BMW

Engine Start Blocked by Immobilizer

Fix path
P0513BMW

Incorrect Immobilizer Key

Fix path
FRM/FRM3 not detectedBMW

BMW FRM/FRM3 Footwell Module unresponsive

Fix path
EWS-DME comm errorBMW

EWS module not authenticating with DME

Fix path
CAS-DME comm errorBMW

CAS module unable to authorize start

Fix path
BMW E46 cluster pixel lossBMW

BMW E38/E39/E46 instrument cluster pixel dropouts

Fix path
BMW DDE immobilizer faultBMW

BMW diesel DDE immobilizer authentication failure

Fix path
FEM ISN mismatchBMW

BMW F-chassis FEM/BDC ISN doesn't match DME

Fix path
FRM3 coding failureBMW

FRM3 bricked during coding attempt

Fix path
P1602BMW

ECU/DME not properly coded to vehicle

Fix path
P1614BMW

Immobilizer no program data received

Fix path
A0B5BMW

BMW F-chassis FEM/BDC general communication fault

Fix path
CAS4/CAS4+ ISN mismatchBMW

BMW F/E-chassis CAS4 ISN doesn't match DME

Fix path
BMW M-DCT DME power-on faultBMW

BMW M-power DME no power on / boot-loop

Fix path
BMW E9x CAS warning light stuckBMW

E90/E91/E92/E93 CAS warning indicator won't clear

Fix path
BMW E60 cluster pixel lossBMW

E60 5-Series cluster LCD pixel dropouts

Fix path
BMW MINI Cooper CAS module faultBMW

MINI Cooper R-series CAS/EWS immobilizer fault

Fix path
BMW E46 ABS Mk60 faultBMW

BMW E46 ATE Mk60 ABS module failure

Fix path
BMW cluster no powerBMW

BMW instrument cluster no power on

Fix path
EWS3 cluster-DME mileage mismatchBMW

BMW EWS3 cluster vs DME stored mileage mismatch

Fix path

Mercedes codes

13 codes

U0001Mercedes

High Speed CAN Communication Bus Error

Fix path
Steering lock faultMercedes

Mercedes Electronic Steering Lock (ELV) failure

Fix path
EIS not reading keyMercedes

Mercedes EIS fails to authenticate inserted key

Fix path
Mercedes W220 EIS failureMercedes

W220 S-Class EIS authentication failure

Fix path
Mercedes W211 EIS failureMercedes

W211 E-Class EIS authentication failure

Fix path
Mercedes W164 ML EIS failureMercedes

W164 M-Class EIS authentication failure

Fix path
Mercedes W204 ECU comm faultMercedes

W204 C-Class ECU not communicating

Fix path
Mercedes cluster pixel fadeMercedes

W210/W203/W211 instrument cluster LCD fading

Fix path
Mercedes EIS-cluster mismatchMercedes

EIS and cluster report different VIN/odometer

Fix path
Mercedes Sprinter ELV failureMercedes

Sprinter / Vito ELV motor failure

Fix path
Mercedes W211 SBC faultMercedes

Mercedes Sensotronic Brake Control fault

Fix path
Mercedes W166 GL/ML ELV faultMercedes

Mercedes W166 GL/ML ELV steering lock failure

Fix path
Mercedes C63 AMG EISMercedes

Mercedes C63 AMG (W204) EIS failure

Fix path

VW / Audi codes

14 codes

P1570VW/Audi

VW/Audi Immobilizer Active — engine start blocked

Fix path
P0513VW/Audi

VW/Audi Incorrect Immobilizer Key

Fix path
Cluster 24C64 damagedVW/Audi

24C64 EEPROM corrupted in VW Jetta cluster

Fix path
P1813VW/Audi

TDI pressure regulator electrical fault

Fix path
P1750VW/Audi

ECU supply voltage fault

Fix path
Audi A4 B7 cluster deadVW/Audi

Audi A4 B7 / B8 instrument cluster non-functional

Fix path
VW Passat B6 cluster IMMO faultVW/Audi

VW Passat B6 cluster immobilizer failure

Fix path
Audi Q5 key not programmedVW/Audi

Audi Q5 (8R) replacement key won't pair

Fix path
VW Touareg communication faultVW/Audi

VW Touareg ECU-cluster comm breakdown

Fix path
P0688VW/Audi

ECM power relay sense circuit fault

Fix path
VW MFD cluster failVW/Audi

VW Passat/Jetta MFD cluster failure

Fix path
VW Jetta Mk5 no startVW/Audi

VW Jetta Mk5 (2005-2010) crank-no-start

Fix path
Audi A3 8P IMMO faultVW/Audi

Audi A3 8P (2003-2013) IMMO failure

Fix path
Porsche Cayenne no startVW/Audi

Porsche Cayenne (955/957/958) crank-no-start

Fix path

Range Rover / Jaguar codes

7 codes

U0156Range Rover/Jaguar

KVM / RFA communication fault

Fix path
All keys lostRange Rover/Jaguar

Range Rover / Land Rover / Jaguar all keys lost

Fix path
Land Rover Discovery 3 no startRange Rover/Jaguar

Discovery 3 (LR3) won't crank or start

Fix path
Range Rover L322 no startRange Rover/Jaguar

Range Rover L322 crank-no-start

Fix path
Jaguar XF RFA failureRange Rover/Jaguar

Jaguar XF (X250/X260) RFA module failure

Fix path
Land Rover LR4 key issueRange Rover/Jaguar

LR4 / Discovery 4 key programming failure

Fix path
Jaguar XJ X351 module no commRange Rover/Jaguar

XJ X351 (2010-2019) widespread no comm

Fix path

GM codes

8 codes

Passlock faultGM

GM Passlock anti-theft triggered after cluster swap

Fix path
GM BCM no communicationGM

GM BCM (Body Control Module) unresponsive

Fix path
GM Passlock II faultGM

GM Passlock II anti-theft active

Fix path
Chevy Cruze IMMO faultGM

Chevy Cruze BCM-pinned IMMO failure

Fix path
Cadillac CTS cluster failureGM

Cadillac CTS / SRX instrument cluster fault

Fix path
GM Duramax no startGM

Chevy/GMC Duramax cranks no start

Fix path
Chevy Impala cluster fadeGM

Chevy Impala instrument cluster pixel fade

Fix path
GM VATS resistor mismatchGM

GM ECM rejects key — wrong resistor value or broken wire

Fix path

Saab codes

3 codes

Saab CIM module faultSaab

Saab Column Integration Module unresponsive

Fix path
Saab 9-3 TID faultSaab

Saab 9-3 Trip Information Display fault

Fix path
Saab 9-5 crank no startSaab

Saab 9-5 cranks but won't start (CIM-related)

Fix path

European multi-brand

1 code

ABS no communicationMercedes/BMW

ABS module fails to respond to OBD scanner

Fix path

Universal / cross-brand

43 codes

B0028Universal

Airbag deployed — SRS module crash data stored

Fix path
B1004Universal

SRS Module Internal Failure / Crash Data Stored

Fix path
C0040Universal

ABS Module Internal Failure

Fix path
Cluster mileage mismatchUniversal

Replacement cluster shows wrong mileage

Fix path
RKE not respondingUniversal

Remote keyless entry not working — module dead

Fix path
Crank-no-startUniversal

Engine cranks normally but won't start

Fix path
All keys lostUniversal

No working key for a European vehicle

Fix path
Used module pairing failureUniversal

Used donor module won't accept new VIN

Fix path
P164BUniversal

Engine Stop Detected — Immobilizer Activated

Fix path
Donor ECU not runningUniversal

Used ECU installed but vehicle won't start

Fix path
B0001Universal

Driver airbag deployment loop fault

Fix path
B0002Universal

Passenger airbag deployment loop fault

Fix path
B0010Universal

Side curtain airbag deployment fault

Fix path
B0020Universal

Seat belt pretensioner deployed

Fix path
C0035Universal

ABS wheel speed sensor fault

Fix path
C0050Universal

ABS rear wheel speed sensor fault

Fix path
C0110Universal

ABS pump motor circuit fault

Fix path
Cluster mileage rollbackUniversal

Customer asking for cluster mileage rollback

Fix path
Smart key fob not detectedUniversal

Push-button-start fob not recognized

Fix path
RKE loss of programmingUniversal

Multiple fobs stopped working at once

Fix path
P0606Universal

ECM/PCM internal processor fault

Fix path
U0073Universal

Control module communication bus A off

Fix path
U0100Universal

Lost communication with ECM/PCM

Fix path
U0140Universal

Lost communication with body control module

Fix path
U0155Universal

Lost communication with instrument cluster

Fix path
P1626Universal

Immobilizer no key data received

Fix path
P1631Universal

Immobilizer incorrect challenge response

Fix path
P1633Universal

Immobilizer power supply fault

Fix path
Comm fault after battery disconnectUniversal

Multiple module faults after a flat battery

Fix path
Module water damageUniversal

Module dead after flooding or rain leak

Fix path
Fire-damaged module recoveryUniversal

Module from a partial vehicle fire

Fix path
Volvo CEM module failureUniversal

Volvo CEM (Central Electronic Module) failure

Fix path
Used cluster from different VINUniversal

Junkyard cluster won't accept your VIN

Fix path
Multiple errors after jump startUniversal

Modules failed after improper jump-start

Fix path
Faults after aftermarket stereo installUniversal

CAN-bus errors after aftermarket headunit

Fix path
Faults after aftermarket alarmUniversal

IMMO faults after aftermarket alarm install

Fix path
P160AUniversal

ECU memory checksum fault

Fix path
P2610Universal

ECM/PCM internal timer fault

Fix path
B1601Universal

Ford PATS received invalid format of key code

Fix path
B1602Universal

Ford PATS received invalid key

Fix path
B2103Universal

Ford PATS no transceiver communication

Fix path
B1213Universal

Ford PATS fewer than minimum programmed keys

Fix path
PCM security access deniedUniversal

Tuner software refuses to read/write PCM — security access denied

Fix path

Don't see your code?

We've handled most BMW, Mercedes, VW/Audi, Land Rover, and GM immobilizer + module faults. If your code isn't listed, text us the year/make/model + the code and we'll point you at the right service.

Ask us about your code