OBD-II code · Network
U02AE Lost Communication With Hybrid/EV Battery Coolant Pump
The vehicle bus reports loss of communication with the high-voltage battery coolant pump. Active battery cooling cannot be regulated; charging/discharging power may be limited to protect the cells.
Is it safe to drive with U02AE?
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 Battery Coolant Pump, Vehicle Bus Wiring
Related codes
- U02ABLost Communication With Vehicle Thermal Management Control Module
- U02ACLost Communication With Turbocharger/Supercharger Boost Control A
- U02ADLost Communication With Turbocharger/Supercharger Boost Control B
- U02AFLost Communication With Turbocharger Turbine Inlet Valve Position Sensor
- U02B0Lost Communication With Turbocharger/Supercharger Boost Control B Position Sensor
- U02B1Lost Communication With Comfort and Convenience Display A
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.