P0C80Hybrid/EV Battery Temperature Sensor G Circuit Intermittent/Erratic
- 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
- P0C80 catches a sensor G signal that jumps around instead of following the slow thermal drift of a large battery. GM spells out the logic in its hybrid tables 18OBDG02 and 19OBDG02: every 100 ms the module sums the absolute changes of the reading across a 10-sample window, a total above 10 fails that window, and 4 failed windows out of 5 set the code as Type B, two trips, provided system voltage exceeds 10.2 V and the battery interface module is communicating. Mitsubishi's Outlander PHEV has no erratic code for this sensor. The value stays inside its valid range, which separates P0C80 from P0C7E and P0C7F; a loose terminal or a cracked conductor is the usual reason. When several sensors on one board jump together, suspect the board or its supply.
- What you may notice
- Warning lamp that may come and go between trips
- Jumping sensor G value in live data
- Occasional power reduction
- Likely causes
- LikelyLoose or fretting terminal in the sensor G connector
- PossibleConductor cracked inside the insulation, breaking under vibration
- RareCell monitoring board with unstable reference or ground
- 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: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.