Network
generic / SAE
U01A2
Lost Communication With Hybrid/EV Battery Interface Control Module C
ECU lost CAN communication with hybrid/EV HV battery interface module C (BMS slave or cell-monitoring submodule).
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number1 / A2
Possible causes
- Module unpowered high
- Gateway module routing CAN messages incorrectly low
- CAN terminating resistor (120 Ω) drifted out of spec low
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
- Estimated cost: 300–3000 €
- Estimated time: 1–8 h
- Component: hv battery interface c
- Component: can bus
- MIL / check engine light
- drive cycle required
- limp mode possible
Sources
References
sae:J2012