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Module communication (CAN bus) fault codes

275 VAG and OBD-II codes covering module communication (can bus), each with what it means in plain English and how urgent it is.

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Code	Definition	Severity
`00470`	Data Bus for Comfort System: Single-Wire Operation / Open Circuit	Investigate soon
`00546`	Data Bus Powertrain - Missing Message / Defective	Investigate soon
`01304`	Radio (R): No Signal / No Communication (databus)	Investigate soon
`01305`	Data Bus for Infotainment: No Signal / No Communication	Investigate soon
`01309`	Power Steering Control Module (J500): No Communication / Implausible Signal	Do not keep driving
`01310`	Ride Height / Level Control Module (J197): No Communication (databus)	Investigate soon
`01312`	Powertrain Data Bus (CAN): Faulty / Excessive Communication Errors	Investigate soon
`01314`	Engine Control Module: No Signal / No Communication (databus)	Investigate soon
`01316`	ABS Control Module: No Signal / No Communication (databus)	Do not keep driving
`01317`	Control Module in Instrument Cluster (J285): No Communication (databus)	Investigate soon
`01321`	Airbag Control Module (J234): No Signal / No Communication (databus)	Safety system
`01324`	All Wheel Drive Control Module (J492): No Communication (databus)	Investigate soon
`01325`	Tire Pressure Monitoring Control Module (J502): No Communication (databus)	Investigate soon
`01326`	Multi-Function Steering Wheel Control Module (J453): No Communication (databus)	Do not keep driving
`01333`	Door Control Module, Rear Left (J388): No Communication / Defective	Investigate soon
`01334`	Door Control Module, Rear Right (J389): No Communication / Defective	Investigate soon
`01335`	Driver Side Seat/Mirror Adjustment Control Module: No Communication (databus)	Investigate soon
`01336`	Data Bus for Comfort System: Faulty / Single-Wire Operation	Investigate soon
`18005`	Data Bus Powertrain: missing message from level control system control module (J197)	Investigate soon
`18057`	Data Bus Powertrain: Missing Message from ABS Control Module	Do not keep driving
`18058`	Data Bus Powertrain: Missing Message from Instrument Cluster (J285)	Investigate soon
`B116A`	Door Control Module; Driver Side (J386) — internal fault / no communication	Investigate soon
`B1304`	Left Front Belt Tensioner Control Module (J854): Not Configured / no communication	Safety system
`B1305`	Right Front Belt Tensioner Control Module (J855): Not Configured / no communication	Safety system
`P0600`	Serial Communication Link	Investigate soon
`P0644`	Driver Display Serial Communication Circuit	Investigate soon
`P0683`	Glow Plug Control Module 1 to PCM Communication Circuit	Investigate soon
`P0684`	Glow Plug Control Module 1 to PCM Communication Circuit Range/Performance	Investigate soon
`P0863`	TCM Communication Circuit	Investigate soon
`P0864`	TCM Communication Circuit Range/Performance	Investigate soon
`P0865`	TCM Communication Circuit Low	Investigate soon
`P0866`	TCM Communication Circuit High	Investigate soon
`P1628`	Data Bus Powertrain - Missing Message from Steering Angle Sensor	Do not keep driving
`P1635`	Data Bus Powertrain - Missing Message from A/C Control Module	Investigate soon
`P1636`	Data Bus Powertrain - Missing Message from Airbag Control Module	Safety system
`P1637`	Data Bus Powertrain - Missing Message from Central Electrics	Investigate soon
`P1648`	Data Bus Powertrain - Malfunction	Investigate soon
`P1649`	Data Bus Powertrain - Missing Message from ABS Control Module	Do not keep driving
`P1650`	Data Bus Powertrain - Missing Message from Instrument Cluster	Investigate soon
`P1850`	Data Bus Powertrain - Missing Message from Engine Control Module (ECM)	Investigate soon
`P1851`	Data Bus Powertrain - Missing Message from Brake Control Module (ABS)	Do not keep driving
`P1852`	Data Bus Powertrain - Implausible Message from Engine Control Module (ECM)	Investigate soon
`P1854`	Data Bus Powertrain - Hardware Defective	Investigate soon
`P1855`	Data Bus Powertrain - Software Version Control Malfunction	Investigate soon
`P1860`	Kick-Down Switch - Error Message via Data Bus Powertrain	Investigate soon
`U0001`	High Speed CAN Communication Bus	Investigate soon
`U0002`	High Speed CAN Communication Bus - Performance / signal implausible	Investigate soon
`U0003`	High Speed CAN Communication Bus (+) / CAN-High Open circuit	Investigate soon
`U0004`	High Speed CAN Communication Bus (+) / CAN-High shorted Low (to ground)	Investigate soon
`U0005`	High Speed CAN Communication Bus (+) / CAN-High shorted High (to B+)	Investigate soon
`U0006`	High Speed CAN Communication Bus (-) / CAN-Low Open circuit	Investigate soon
`U0007`	High Speed CAN Communication Bus (-) / CAN-Low shorted Low (to ground)	Investigate soon
`U0008`	High Speed CAN Communication Bus (-) / CAN-Low shorted High (to B+)	Investigate soon
`U0009`	High Speed CAN Communication Bus (-) shorted to Bus (+) / CAN-Low shorted to CAN-High	Investigate soon
`U0010`	Medium Speed CAN Communication Bus (comfort/infotainment CAN) - general bus fault	Investigate soon
`U0011`	Medium Speed CAN Communication Bus - Performance / signal implausible	Investigate soon
`U0012`	Medium Speed CAN Communication Bus (+) Open	Investigate soon
`U0013`	Medium Speed CAN Communication Bus (+) shorted Low (to ground)	Investigate soon
`U0014`	Medium Speed CAN Communication Bus (+) shorted High (to B+)	Investigate soon
`U0015`	Medium Speed CAN Communication Bus (-) Open	Investigate soon
`U0016`	Medium Speed CAN Communication Bus (-) shorted Low (to ground)	Investigate soon
`U0017`	Medium Speed CAN Communication Bus (-) shorted High (to B+)	Investigate soon
`U0018`	Medium Speed CAN Communication Bus (-) shorted to Bus (+)	Investigate soon
`U0019`	Low Speed CAN Communication Bus (comfort/convenience CAN) - general bus fault	Investigate soon
`U0020`	Low Speed CAN Communication Bus - Performance / signal implausible	Investigate soon
`U0021`	Low Speed CAN Communication Bus (+) Open	Investigate soon
`U0022`	Low Speed CAN Communication Bus (+) shorted Low (to ground)	Investigate soon
`U0023`	Low Speed CAN Communication Bus (+) shorted High (to B+)	Investigate soon
`U0024`	Low Speed CAN Communication Bus (-) Open	Investigate soon
`U0025`	Low Speed CAN Communication Bus (-) shorted Low (to ground)	Investigate soon
`U0026`	Low Speed CAN Communication Bus (-) shorted High (to B+)	Investigate soon
`U0027`	Low Speed CAN Communication Bus (-) shorted to Bus (+)	Investigate soon
`U0028`	Vehicle Communication Bus A - general fault	Investigate soon
`U0029`	Vehicle Communication Bus A - Performance / implausible	Investigate soon
`U0030`	Vehicle Communication Bus A (+) Open	Investigate soon
`U0031`	Vehicle Communication Bus A (+) shorted Low (to ground)	Investigate soon
`U0032`	Vehicle Communication Bus A (+) shorted High (to B+)	Investigate soon
`U0033`	Vehicle Communication Bus A (-) Open	Investigate soon
`U0034`	Vehicle Communication Bus A (-) shorted Low (to ground)	Investigate soon
`U0035`	Vehicle Communication Bus A (-) shorted High (to B+)	Investigate soon
`U0036`	Vehicle Communication Bus A (-) shorted to Bus A (+)	Investigate soon
`U0037`	Vehicle Communication Bus B - general fault	Investigate soon
`U0038`	Vehicle Communication Bus B - Performance / implausible	Investigate soon
`U0039`	Vehicle Communication Bus B (+) Open	Investigate soon
`U0040`	Vehicle Communication Bus B (+) shorted Low (to ground)	Investigate soon
`U0041`	Vehicle Communication Bus B (+) shorted High (to B+)	Investigate soon
`U0042`	Vehicle Communication Bus B (-) Open	Investigate soon
`U0043`	Vehicle Communication Bus B (-) shorted Low (to ground)	Investigate soon
`U0044`	Vehicle Communication Bus B (-) shorted High (to B+)	Investigate soon
`U0045`	Vehicle Communication Bus B (-) shorted to Bus B (+)	Investigate soon
`U0046`	Vehicle Communication Bus C - general fault (Infotainment CAN)	Investigate soon
`U0047`	Vehicle Communication Bus C - Performance / implausible	Investigate soon
`U0048`	Vehicle Communication Bus C (+) Open	Investigate soon
`U0049`	Vehicle Communication Bus C (+) shorted Low (to ground)	Investigate soon
`U0050`	Vehicle Communication Bus C (+) shorted High (to B+)	Investigate soon
`U0051`	Vehicle Communication Bus C (-) Open	Investigate soon
`U0052`	Vehicle Communication Bus C (-) shorted Low (to ground)	Investigate soon
`U0053`	Vehicle Communication Bus C (-) shorted High (to B+)	Investigate soon
`U0054`	Vehicle Communication Bus C (-) shorted to Bus C (+)	Investigate soon
`U0055`	Vehicle Communication Bus D - general fault	Investigate soon
`U0056`	Vehicle Communication Bus D - Performance / implausible	Investigate soon
`U0057`	Vehicle Communication Bus D (+) Open	Investigate soon
`U0058`	Vehicle Communication Bus D (+) shorted Low (to ground)	Investigate soon
`U0059`	Vehicle Communication Bus D (+) shorted High (to B+)	Investigate soon
`U0060`	Vehicle Communication Bus D (-) Open	Investigate soon
`U0061`	Vehicle Communication Bus D (-) shorted Low (to ground)	Investigate soon
`U0062`	Vehicle Communication Bus D (-) shorted High (to B+)	Investigate soon
`U0063`	Vehicle Communication Bus D (-) shorted to Bus D (+)	Investigate soon
`U0064`	Vehicle Communication Bus E - general fault	Investigate soon
`U0065`	Vehicle Communication Bus E - Performance / implausible	Investigate soon
`U0066`	Vehicle Communication Bus E (+) Open	Investigate soon
`U0067`	Vehicle Communication Bus E (+) shorted Low (to ground)	Investigate soon
`U0068`	Vehicle Communication Bus E (+) shorted High (to B+)	Investigate soon
`U0069`	Vehicle Communication Bus E (-) Open	Investigate soon
`U0070`	Vehicle Communication Bus E (-) shorted Low (to ground)	Investigate soon
`U0071`	Vehicle Communication Bus E (-) shorted High (to B+)	Investigate soon
`U0072`	Vehicle Communication Bus E (-) shorted to Bus E (+)	Investigate soon
`U0073`	Control Module Communication Bus 'A' Off (CAN bus-off - controller stopped transmitting)	Investigate soon
`U0074`	Control Module Communication Bus 'B' Off (CAN bus-off)	Investigate soon
`U0075`	Control Module Communication Bus 'C' Off (CAN bus-off)	Investigate soon
`U0076`	Control Module Communication Bus 'D' Off (CAN bus-off)	Investigate soon
`U0077`	Control Module Communication Bus 'E' Off (CAN bus-off)	Investigate soon
`U0078`	Control Module Communication Bus 'F' Off (CAN bus-off)	Investigate soon
`U0079`	Control Module Communication Bus 'G' Off (CAN bus-off)	Investigate soon
`U0100`	Lost Communication With ECM/PCM A	Investigate soon
`U0101`	Lost Communication With TCM	Investigate soon
`U0102`	Lost Communication With Transfer Case Control Module	Investigate soon
`U0104`	Lost Communication With Cruise Control Module	Investigate soon
`U0106`	Lost Communication With Glow Plug Control Module 1	Investigate soon
`U010A`	Lost Communication With Exhaust Gas Recirculation Control Module A	Investigate soon
`U010B`	Lost Communication With Exhaust Gas Recirculation Control Module B	Investigate soon
`U010F`	Lost Communication With Air Conditioning Control Module	Investigate soon
`U0110`	Lost Communication With Drive Motor Control Module A	Investigate soon
`U0113`	Lost Communication With Emissions Critical Control Information	Investigate soon
`U0115`	Lost Communication With ECM/PCM B	Investigate soon
`U0117`	Lost Communication With PTO Control Module	Investigate soon
`U011A`	Lost Communication With Exhaust Gas Sensor Module A	Investigate soon
`U011B`	Lost Communication With Rocker Arm Control Module A	Investigate soon
`U011C`	Lost Communication With Rocker Arm Control Module B	Investigate soon
`U011D`	Lost Communication With All Wheel Drive Control Module	Investigate soon
`U0120`	Lost Communication With Starter / Generator Control Module	Investigate soon
`U0121`	Lost Communication With Anti-Lock Brake System (ABS) Control Module A	Do not keep driving
`U0122`	Lost Communication With Vehicle Dynamics Control Module	Investigate soon
`U0123`	Lost Communication With Yaw Rate Sensor Module	Investigate soon
`U0124`	Lost Communication With Lateral Acceleration Sensor Module	Investigate soon
`U0125`	Lost Communication With Multi-axis Acceleration Sensor Module A	Investigate soon
`U0126`	Lost Communication With Steering Angle Sensor Module	Do not keep driving
`U0127`	Lost Communication With Tire Pressure Monitor Module	Investigate soon
`U0128`	Lost Communication With Park Brake Control Module	Do not keep driving
`U0129`	Lost Communication With Brake System Control Module A	Do not keep driving
`U0130`	Lost Communication With Steering Effort Control Module	Do not keep driving
`U0131`	Lost Communication With Power Steering Control Module A	Do not keep driving
`U0132`	Lost Communication With Ride Level / Air Suspension Control Module (J197)	Investigate soon
`U0133`	Lost Communication With Active Roll Control Module	Investigate soon
`U0134`	Lost Communication With Power Steering Control Module - Rear	Do not keep driving
`U0135`	Lost Communication With Differential Control Module - Front	Investigate soon
`U0136`	Lost Communication With Differential Control Module - Rear	Investigate soon
`U0138`	Lost Communication With All Terrain Control Module	Investigate soon
`U0139`	Lost Communication With Suspension Control Module B	Investigate soon
`U0140`	Lost Communication With Body Control Module	Investigate soon
`U0141`	Lost Communication With Body Control Module A	Investigate soon
`U0142`	Lost Communication With Body Control Module B	Investigate soon
`U0143`	Lost Communication With Body Control Module C	Investigate soon
`U0144`	Lost Communication With Body Control Module D	Investigate soon
`U0145`	Lost Communication With Body Control Module E	Investigate soon
`U0146`	Lost Communication With Gateway 'A' (central Gateway / Diagnostic Interface for Databus J533)	Investigate soon
`U0147`	Lost Communication With Gateway 'B' (Serial Data Gateway Module B)	Investigate soon
`U0148`	Lost Communication With Gateway 'C'	Investigate soon
`U0149`	Lost Communication With Gateway 'D'	Investigate soon
`U0150`	Lost Communication With Gateway 'E'	Investigate soon
`U0151`	Lost Communication With Restraints Control Module	Safety system
`U0152`	Lost Communication With Side Restraints Control Module - Left	Safety system
`U0153`	Lost Communication With Side Restraints Control Module - Right	Safety system
`U0154`	Lost Communication With Restraints Occupant Classification System Module	Safety system
`U0155`	Lost Communication With Instrument Panel Cluster (IPC) Control Module	Investigate soon
`U0156`	Lost Communication With Information Center A	Investigate soon
`U0157`	Lost Communication With Information Center B	Investigate soon
`U0158`	Lost Communication With Head Up Display	Investigate soon
`U0159`	Lost Communication With Parking Assist Control Module A	Investigate soon
`U0160`	Lost Communication With Audible Alert Control Module	Investigate soon
`U0161`	Lost Communication With Compass Module	Investigate soon
`U0162`	Lost Communication With Navigation Display Module	Investigate soon
`U0163`	Lost Communication With Navigation Control Module	Investigate soon
`U0164`	Lost Communication With HVAC Control Module	Investigate soon
`U0165`	Lost Communication With HVAC Control Module - Rear	Investigate soon
`U0166`	Lost Communication With Auxiliary Heater Control Module	Investigate soon
`U0167`	Lost Communication With Vehicle Immobilizer Control Module	Investigate soon
`U0168`	Lost Communication With Vehicle Security Control Module	Investigate soon
`U0169`	Lost Communication With Sunroof Control Module	Investigate soon
`U016A`	Lost Communication With Global Positioning System Module	Investigate soon
`U0170`	Lost Communication With Restraints System Sensor A	Safety system
`U0171`	Lost Communication With Restraints System Sensor B	Safety system
`U0172`	Lost Communication With Restraints System Sensor C	Safety system
`U0173`	Lost Communication With Restraints System Sensor D	Safety system
`U0174`	Lost Communication With Restraints System Sensor E	Safety system
`U0175`	Lost Communication With Restraints System Sensor F	Safety system
`U0176`	Lost Communication With Restraints System Sensor G	Safety system
`U0177`	Lost Communication With Restraints System Sensor H	Safety system
`U0178`	Lost Communication With Restraints System Sensor I	Safety system
`U0179`	Lost Communication With Restraints System Sensor J	Safety system
`U017A`	Lost Communication With Restraints System Sensor K	Safety system
`U017B`	Lost Communication With Restraints System Sensor L	Safety system
`U017C`	Lost Communication With Restraints System Sensor M	Safety system
`U017D`	Lost Communication With Restraints System Sensor N	Safety system
`U017E`	Lost Communication With Seat Belt Pretensioner Module A	Safety system
`U017F`	Lost Communication With Seat Belt Pretensioner Module B	Safety system
`U0180`	Lost Communication With Automatic Lighting Control Module	Investigate soon
`U0181`	Lost Communication With Headlamp Leveling Control Module A	Investigate soon
`U0182`	Lost Communication With Lighting Control Module - Front	Investigate soon
`U0183`	Lost Communication With Lighting Control Module - Rear A	Investigate soon
`U0184`	Lost Communication With Radio	Investigate soon
`U0185`	Lost Communication With Antenna Control Module	Investigate soon
`U0186`	Lost Communication With Audio Amplifier A	Investigate soon
`U0187`	Lost Communication With Digital Disc Player/Changer Module A	Investigate soon
`U0188`	Lost Communication With Digital Disc Player/Changer Module B	Investigate soon
`U0189`	Lost Communication With Digital Disc Player/Changer Module C	Investigate soon
`U0190`	Lost Communication With Digital Disc Player/Changer Module D	Investigate soon
`U0191`	Lost Communication With Television	Investigate soon
`U0192`	Lost Communication With Personal Computer	Investigate soon
`U0193`	Lost Communication With Digital Audio Control Module A	Investigate soon
`U0194`	Lost Communication With Digital Audio Control Module B	Investigate soon
`U0195`	Lost Communication With Subscription Entertainment Receiver Module	Investigate soon
`U0196`	Lost Communication With Entertainment Control Module - Rear A	Investigate soon
`U0197`	Lost Communication With Telephone Control Module	Investigate soon
`U0198`	Lost Communication With Telematic Control Module	Investigate soon
`U0199`	Lost Communication With Door Control Module A	Investigate soon
`U0200`	Lost Communication With Door Control Module 'B' (Front Passenger door J387)	Investigate soon
`U0201`	Lost Communication With Door Control Module 'C' (Rear Left door J388)	Investigate soon
`U0202`	Lost Communication With Door Control Module 'D' (Rear Right door J389)	Investigate soon
`U0203`	Lost Communication With Door Control Module 'E'	Investigate soon
`U0204`	Lost Communication With Door Control Module 'F'	Investigate soon
`U0205`	Lost Communication With Door Control Module 'G'	Investigate soon
`U0206`	Lost Communication With Folding Top / Convertible Top Control Module (J256)	Investigate soon
`U0207`	Lost Communication With Movable Roof Control Module 'A'	Investigate soon
`U0208`	Lost Communication With Seat Control Module 'A' (Driver seat memory J136)	Investigate soon
`U0209`	Lost Communication With Seat Control Module 'B' (Passenger seat J521)	Investigate soon
`U0210`	Lost Communication With Seat Control Module 'C'	Investigate soon
`U0211`	Lost Communication With Seat Control Module 'D'	Investigate soon
`U0212`	Lost Communication With Steering Column Control Module (J527 steering column electronics)	Do not keep driving
`U0213`	Lost Communication With Mirror Control Module	Investigate soon
`U0214`	Lost Communication With Remote Function Actuation (keyless entry / RFA, Kessy J518)	Investigate soon
`U0215`	Lost Communication With Door Switch 'A'	Investigate soon
`U0216`	Lost Communication With Door Switch 'B'	Investigate soon
`U0217`	Lost Communication With Door Switch 'C'	Investigate soon
`U0218`	Lost Communication With Door Switch 'D'	Investigate soon
`U0219`	Lost Communication With Door Switch 'E'	Investigate soon
`U0220`	Lost Communication With Door Switch 'F'	Investigate soon
`U0221`	Lost Communication With Door Switch 'G'	Investigate soon
`U0222`	Lost Communication With Door Window Motor 'A'	Investigate soon
`U0223`	Lost Communication With Door Window Motor 'B'	Investigate soon
`U0224`	Lost Communication With Door Window Motor 'C'	Investigate soon
`U0225`	Lost Communication With Door Window Motor 'D'	Investigate soon
`U0226`	Lost Communication With Door Window Motor 'E'	Investigate soon
`U0229`	Lost Communication With Heated Steering Wheel Module	Do not keep driving
`U0230`	Lost Communication With Rear Gate / Liftgate Control Module (J605)	Investigate soon
`U0231`	Lost Communication With Rain Sensing / Rain-Light Sensor Module (G397)	Investigate soon
`U0232`	Lost Communication With Side Obstacle Detection Control Module 'A' (Lane Change / Side Assist)	Investigate soon
`U0233`	Lost Communication With Side Obstacle Detection Control Module 'B' (Lane Change / Side Assist)	Investigate soon
`U0234`	Lost Communication With Convenience / Comfort Recall Module	Investigate soon
`U0235`	Lost Communication With Cruise Control Front Distance Range Sensor (single ACC radar sensor, J428)	Investigate soon
`U0236`	Lost Communication With Steering Column Lock Module	Do not keep driving
`U0245`	Lost Communication With Entertainment Control Module, Front	Investigate soon
`U0253`	Lost Communication With Accessory Protocol Interface Module (APIM)	Investigate soon
`U0293`	Lost Communication With Hybrid / High-Voltage (EV) Powertrain Control Module	Investigate soon
`U0400`	Invalid Data Received (generic - implausible databus message)	Investigate soon
`U1030`	Local Databus (LIN) — electrical fault (HVAC actuator sub-bus)	Investigate soon
`U10BA`	Local Databus (LIN sub-bus) — no communication with HVAC sub-node/actuator	Investigate soon
`U1111`	VAG manufacturer: Function Restriction due to Missing / Received Faulty Messages (databus)	Investigate soon
`U1112`	Databus: Function Restriction due to Implausible Message(s) - a bus message from another named control module was received but contains implausible / out-of-range signal data, so dependent functions in this module are limited. Sub-code identifies the source module.	Investigate soon
`U1113`	VAG manufacturer: Function limitation due to lack of / faulty databus messages	Investigate soon
`U1121`	VAG manufacturer: Databus Missing Message (expected message from a required control module not received)	Investigate soon
`U1122`	Databus: Implausible Message (Databus Unreasonable Message) - a message from a named module was received on the bus but its content fails plausibility/range checks. Sub-code identifies the transmitting module.	Investigate soon
`U1123`	VAG manufacturer: Databus Received Error / Implausible Message (invalid or missing data on CAN)	Investigate soon
`U1420`	VAG manufacturer: Databus / message fault - invalid value received from control module	Investigate soon
`U1421`	VAG manufacturer: Databus / message fault - implausible value received from control module	Investigate soon

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