Fault codes U0300–U0399
U03xx codes mainly cover: module communication. Our list has 29 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 U0301, U0302, U0303. Based on AI combined with our hands-on workshop experience and knowledge.
Most common in this range
U0301Software 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 module
All codes in this range
U0301Software 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) A
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.