P0CA8Hybrid/EV Battery Temperature Sensor M 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
- P0CA8 is the general circuit code for battery temperature sensor M, meant for electrical faults that the controller does not sort into low, high or erratic. No manufacturer publishes this exact code. In GM's 2011 Volt table the rationality list gives M the thirteenth of sixteen positions, yet GM only defines P0CA9 to P0CAC for it. Mitsubishi's Outlander PHEV assigns M to module sensor [12] and also uses only the rationality, short and open codes. CARB section (e)(15.3.1) requires continuous checks of range and continuity for inputs of this kind. Without a usable value the battery controller must assume a hot module section and restricts power. Repair means opening the made-safe traction battery and checking the sensor, its leads and the plug at the monitoring board.
- What you may notice
- Hybrid or EV warning, possibly with check-engine lamp
- Electric power reduced until repaired
- Likely causes
- LikelyPoor contact at the plug of sensor M on the monitoring board
- PossibleThermistor M damaged
- RareFaulty input channel of the cell monitoring board
- 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.