P0BC2Hybrid/EV Battery Temperature Sensor E Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- Battery temperature sensor E is the fifth thermistor in the high-voltage pack; GM's Chevrolet Volt bulletin 18-NA-342 lists the E codes as temperature sensor 5 of nine. P0BC2 is the general circuit code, used when the controller detects an electrical fault without classing it as low, high or erratic. GM's hybrid tables report only the specific siblings P0BC3 to P0BC6. NHTSA's summary of an Audi pending service solution for 2027 Q6 and A6 e-tron models names P0BC2 with a failure type byte among implausible temperature sensor errors. CARB requires battery temperature sensors to be monitored for circuit faults. With one value missing the controller limits charge and discharge power. The sensor sits inside the pack, so checks call for high-voltage safety procedures.
- What you may notice
- Hybrid or EV system warning and MIL
- Reduced power or charging rate
- Battery cooling running more than usual
- Likely causes
- LikelyLoose or corroded connector of sensor E at the sensing board
- PossibleFailed thermistor E
- RareFaulty input on the battery sensing board or module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €150 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.