OBD-II code · Network
U02BA Lost Communication With Hybrid/EV Electronics Coolant Pump B
The vehicle bus reports loss of communication with the hybrid/EV power-electronics coolant pump B. Inverters and DC/DC stages on this loop lose active cooling and may derate.
Is it safe to drive with U02BA?
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 B, Vehicle Bus Wiring
Related codes
- U02C1Lost Communication With Hybrid/EV Electronics Coolant Pump C
- U063DLost Communication With Hybrid/EV Electronics Coolant Pump A
- U02B7Lost Communication With Rear Radar Module B
- U02B8Lost Communication With Rear Radar Module C
- U02B9Lost Communication With Rear Radar Module D
- U02BBLost Communication With EVAP System Purge Pump
- U02BCLost Communication With Localization and Mapping Module
- U02BDLost Communication With Night Vision Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.