U012CLost Communication With Active Vibration Control Module
- Generic OBD-II code · Network
- How the car detects it
- U012C covers the controller that drives active engine mounts or inertial shakers to cancel engine vibration, for example in cars that switch off cylinders. Such a unit needs engine speed and load from the network to generate a counter-phase force; a Honda patent (US 10360893) describes a separate AVC control unit with actuators and acceleration sensors that adapts its cancelling output to engine rotation. No manufacturer publishes a description of U012C itself, so the setting rule is the general one from CARB's network monitoring: the receiving controller stores the code when expected frames stay away. Engine mount actuator wiring has its own codes, P0A14 and following; invalid data is U042D. Expect more cabin vibration, usually no MIL.
- What you may notice
- Noticeable engine vibration at idle or in cylinder deactivation mode
- Humming or booming noise in the cabin
- Fuel saving mode may stay disabled
- Likely causes
- LikelyPower or ground of the vibration control unit missing
- PossibleBus wire or connector damaged near engine or subframe
- RareActive vibration control module internally faulty
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.