Network
generic / SAE
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.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number2 / AE
Possible causes
- Bus wiring open or shorted high
- Module without power or ground medium
- Module failed medium
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
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 200–1500 €
- Estimated time: 0.5–3 h
- Component: hv battery coolant pump
- Component: vehicle bus wiring
- MIL / check engine light
- drive cycle required
- limp mode possible
Sources
References
sae:J2012