Network
generic / SAE
U029A
Lost Communication With Hybrid/EV Battery Pack Sensor Module
The vehicle bus reports loss of communication with the high-voltage battery pack sensor module. Cell-voltage and temperature data needed for state-of-charge and state-of-health calculation are missing.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number2 / 9A
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: hard
- DIY: shop recommended
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References
sae:J2012