P0C7CHybrid/EV Battery Temperature Sensor G 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
- P0C7C is the umbrella circuit code for battery temperature sensor G, used when the controller sees an electrical fault in that input without sorting it into low, high or erratic. No manufacturer documents P0C7C publicly. GM numbers sensor G as sensor 7 of the nine thermistors in the Volt pack (bulletin 18-NA-342), yet its hybrid tables only carry the narrower codes P0C7D to P0C80; Mitsubishi likewise splits sensor G into rationality, short and open. CARB section (e)(15.3.1) asks for continuous checks of range and circuit continuity on every such input. Without a trustworthy reading the battery controller has to assume the worst for that cell group and trims charge and discharge power. The thermistor lives inside the high-voltage pack, so testing needs HV safety procedures.
- What you may notice
- Hybrid or EV system warning lamp, check-engine lamp on many models
- Reduced electric power and slower charging
- Battery cooling or heating running without obvious need
- Likely causes
- LikelyCorroded or loose connector between sensor G and the sensing board
- PossibleThermistor G failed electrically
- RareFaulty input stage on the cell monitoring board or battery 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.