P0CB2Hybrid/EV Battery Temperature Sensor O 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
- P0CB2 is the catch-all electrical code for battery temperature sensor O, reserved for circuit faults that are not classified as low, high or erratic. Publicly, no manufacturer documents this exact code. Counting the rationality list in GM's 2011 Volt table puts O in position 15 of 16, but GM only uses P0CB3 to P0CB6 for it. Mitsubishi maps O to module sensor [14] of the Outlander PHEV and likewise relies on the rationality, short and open codes alone. CARB section (e)(15.2.3)(A)(iv) counts battery temperature sensors among the inputs that have to be monitored, and (A)(v) asks for codes that point to the smallest replaceable unit. With O unusable, the controller has to guess the module temperature and normally cuts battery power. The thermistor sits inside the pack, so repair is a high-voltage job.
- What you may notice
- Hybrid or EV system warning, possibly with check-engine lamp
- Reduced electric power or charging rate
- Likely causes
- LikelyPoor contact at the sensor O connector on the monitoring board
- PossibleDamaged lead between thermistor O and the board
- RareFaulty measuring channel in the cell monitoring unit
- 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.