Network & communication
Definition only
Lights the check engine lamp
U012C: Lost Communication With Active Vibration Control Module
Standardized SAE J2012 code · U01xx — Lost communication with modules
What does U012C mean?
ECU lost CAN communication with active vibration control module (used in some hybrid drivetrains to dampen vibrations).
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Common causes
- High Module unpowered
- Low Gateway module routing CAN messages incorrectly
- Low CAN terminating resistor (120 Ω) drifted out of spec
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of U012C on the same make and model first.
U012C in the community
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