OBD-II code · Network
U02C1 Lost Communication With Hybrid/EV Electronics Coolant Pump C
The vehicle bus reports loss of communication with the hybrid/EV power-electronics coolant pump C. Inverters and DC/DC stages on this loop lose active cooling and may derate.
Is it safe to drive with U02C1?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyBus wiring open or shorted
- PossibleModule without power or ground
- PossibleModule failed
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
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Hv Electronics Coolant Pump C, Vehicle Bus Wiring
Related codes
- U02BALost Communication With Hybrid/EV Electronics Coolant Pump B
- U063DLost Communication With Hybrid/EV Electronics Coolant Pump A
- U02BELost Communication With Trailer Backup Assist Control Module
- U02BFLost Communication With Interior Lighting Control Module B
- U02C0Lost Communication With Active Radiator Air Flow Control Module A
- U0300Internal Control Module Software Incompatibility
- U0301Software Incompatibility with ECM/PCM
- U0302Software Incompatibility with TCM
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.