U codes (module communication)
Uxx codes mainly cover: module communication. Our list has 190 codes in this range. With most of them you can drive gently, but get the car checked soon. Repairs cost roughly €60–800, depending on the fault. The most common are U0001, U0002, U0003. Based on AI combined with our hands-on workshop experience and knowledge.
Most common in this range
U0001High-speed CAN bus: faultU0002High-speed CAN bus: performance faultU0003High-speed CAN bus: (+) wire openU0004High-speed CAN bus: (+) voltage lowU0005High-speed CAN bus: (+) voltage highU0006High-speed CAN bus: (−) wire openU0007High-speed CAN bus: (−) voltage lowU0008High-speed CAN bus: (−) voltage high
All codes in this range
U0001High-speed CAN bus: faultU0002High-speed CAN bus: performance faultU0003High-speed CAN bus: (+) wire openU0004High-speed CAN bus: (+) voltage lowU0005High-speed CAN bus: (+) voltage highU0006High-speed CAN bus: (−) wire openU0007High-speed CAN bus: (−) voltage lowU0008High-speed CAN bus: (−) voltage highU0009High-speed CAN bus: wires shorted togetherU0010Medium-speed CAN bus: faultU0011Medium-speed CAN bus: performance faultU0012Medium-speed CAN bus: (+) wire openU0013Medium-speed CAN bus: (+) voltage lowU0014Medium-speed CAN bus: (+) voltage highU0015Medium-speed CAN bus: (−) wire openU0016Medium-speed CAN bus: (−) voltage lowU0017Medium-speed CAN bus: (−) voltage highU0018Medium-speed CAN bus: wires shorted togetherU0019Low-speed CAN bus: faultU0020Low-speed CAN bus: performance faultU0021Low-speed CAN bus: (+) wire openU0022Low-speed CAN bus: (+) voltage lowU0023Low-speed CAN bus: (+) voltage highU0024Low-speed CAN bus: (−) wire openU0025Low-speed CAN bus: (−) voltage lowU0026Low-speed CAN bus: (−) voltage highU0027Low-speed CAN bus: wires shorted togetherU0028Data bus A: faultU0029Data bus A: performance faultU0030Data bus A: (+) wire openU0031Data bus A: (+) voltage lowU0032Data bus A: (+) voltage highU0033Data bus A: (−) wire openU0034Data bus A: (−) voltage lowU0035Data bus A: (−) voltage highU0036Data bus A: wires shorted togetherU0037Data bus B: faultU0038Data bus B: performance faultU0039Data bus B: (+) wire openU0040Data bus B: (+) voltage lowU0041Data bus B: (+) voltage highU0042Data bus B: (−) wire openU0043Data bus B: (−) voltage lowU0044Data bus B: (−) voltage highU0045Data bus B: wires shorted togetherU0073Data bus A switched off (bus off)U0074Data bus B switched off (bus off)U0100No communication with the engine control module (ECM) AU0101No communication with the gearbox control module (TCM)U0102No communication with the transfer case moduleU0104No communication with the cruise control moduleU0105No communication with the injector control moduleU0106No communication with the glow plug control moduleU0107No communication with the throttle actuator moduleU0109No communication with the fuel pump control moduleU0110No communication with the drive motor moduleU0111No communication with the battery management module AU0112No communication with the battery management module BU0114No communication with the 4WD clutch moduleU0115No communication with the engine control module (ECM) BU0116No communication with the coolant temperature moduleU0118No communication with the fuel additive (DPF) moduleU0120No communication with the starter-generator moduleU0121No communication with the ABS control moduleU0122No communication with the stability control (ESP) moduleU0123No communication with the yaw rate sensorU0125No communication with the acceleration sensor (ESP)U0126No communication with the steering angle sensorU0127No communication with the tyre pressure moduleU0128No communication with the electric parking brake moduleU0129No communication with the brake system control moduleU0131No communication with the power steering moduleU0132No communication with the ride height moduleU0136No communication with the rear differential moduleU0139No communication with the suspension module BU0140No communication with the body control module (BCM)U0141No communication with the body control module (BCM) AU0142No communication with the body control module (BCM) BU0143No communication with the body control module (BCM) CU0144No communication with the body control module (BCM) DU0146No communication with the gateway module AU0147No communication with the gateway module BU0148No communication with the gateway module CU0149No communication with the gateway module DU0151No communication with the airbag control moduleU0154No communication with the passenger occupant sensor moduleU0155No communication with the instrument clusterU0156No communication with the driver information centre AU0157No communication with the driver information centre BU0159No communication with the parking assist module AU0163No communication with the navigation moduleU0164No communication with the climate control moduleU0166No communication with the auxiliary heater moduleU0167No communication with the immobiliserU0168No communication with the security moduleU0181No communication with the headlamp levelling moduleU0182No communication with the front lighting moduleU0184No communication with the radioU0198No communication with the telematics moduleU0199No communication with the driver door moduleU0200No communication with the passenger door moduleU0208No communication with the seat module AU0212No communication with the steering column moduleU0231No communication with the rain sensorU0235No communication with the adaptive cruise radarU0241No communication with the headlamp module AU0242No communication with the headlamp module BU0243No communication with the parking assist module BU0264No communication with the rear cameraU0291No communication with the gear selector module BU0292No communication with the drive motor module BU0293No communication with the hybrid powertrain moduleU0301Software mismatch with the engine control module (ECM)U0302Software mismatch with the gearbox control module (TCM)U0303Software mismatch with the transfer case moduleU0304Software mismatch with the gear selector moduleU0305Software mismatch with the cruise control moduleU0306Software mismatch with the injector control moduleU0307Software mismatch with the glow plug control moduleU0308Software mismatch with the throttle actuator moduleU0310Software mismatch with the fuel pump control moduleU0311Software mismatch with the drive motor moduleU0312Software mismatch with the battery management module AU0313Software mismatch with the battery management module BU0314Software mismatch with the 4WD clutch moduleU0315Software mismatch with the ABS control moduleU0316Software mismatch with the stability control (ESP) moduleU0317Software mismatch with the electric parking brake moduleU0318Software mismatch with the brake system control moduleU0320Software mismatch with the power steering moduleU0321Software mismatch with the ride height moduleU0322Software mismatch with the body control module (BCM)U0323Software mismatch with the instrument clusterU0324Software mismatch with the climate control moduleU0325Software mismatch with the auxiliary heater moduleU0326Software mismatch with the immobiliserU0327Software mismatch with the security moduleU0328Software mismatch with the steering angle sensorU0329Software mismatch with the steering column moduleU0330Software mismatch with the tyre pressure moduleU0331Software mismatch with the body control module (BCM) AU0402Invalid data from the gearbox control module (TCM)U0403Invalid data from the transfer case moduleU0404Invalid data from the gear selector moduleU0405Invalid data from the cruise control moduleU0406Invalid data from the injector control moduleU0407Invalid data from the glow plug control moduleU0408Invalid data from the throttle actuator moduleU0410Invalid data from the fuel pump control moduleU0411Invalid data from the drive motor moduleU0412Invalid data from the battery management module AU0413Invalid data from the battery management module BU0414Invalid data from the 4WD clutch moduleU0415Invalid data from the ABS control moduleU0416Invalid data from the stability control (ESP) moduleU0417Invalid data from the electric parking brake moduleU0418Invalid data from the brake system control moduleU0420Invalid data from the power steering moduleU0421Invalid data from the ride height moduleU0422Invalid data from the body control module (BCM)U0423Invalid data from the instrument clusterU0424Invalid data from the climate control moduleU0425Invalid data from the auxiliary heater moduleU0426Invalid data from the immobiliserU0427Invalid data from the security moduleU0428Invalid data from the steering angle sensorU0429Invalid data from the steering column moduleU0430Invalid data from the tyre pressure moduleU0431Invalid data from the body control module (BCM) AU0432Invalid data from the acceleration sensor (ESP)U0437Invalid data from the rear differential moduleU0442Invalid data from the engine control module (ECM) BU0443Invalid data from the body control module (BCM) BU0444Invalid data from the body control module (BCM) CU0445Invalid data from the body control module (BCM) DU0447Invalid data from the gateway module AU0448Invalid data from the gateway module BU0449Invalid data from the gateway module CU0452Invalid data from the airbag control moduleU0455Invalid data from the passenger occupant sensor moduleU0456Invalid data from the coolant temperature moduleU0457Invalid data from the driver information centre AU0458Invalid data from the driver information centre BU0464Invalid data from the navigation moduleU0467Invalid data from the fuel additive (DPF) moduleU0469Invalid data from the starter-generator moduleU0480Invalid data from the seatbelt pretensioner module BU0482Invalid data from the headlamp levelling moduleU0485Invalid data from the radioU0499Invalid data from the telematics module
Want a definite answer?
Bring the car to our workshop in Estonia for diagnostics. We read the fault codes, test the sensors and tell you what is wrong. Repair price depends on the work involved, generally €45 per hour.