P0C33Hybrid/EV Battery Temperature Sensor F 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 F is the sixth thermistor in the high-voltage pack; GM's Volt bulletin 18-NA-342 lists the F codes under temperature sensor 6 of nine. P0C33 is the general circuit code for an electrical fault the controller does not classify as low, high or erratic. No manufacturer documents this exact code publicly: GM's hybrid tables use only the more specific siblings P0C34 to P0C37. CARB requires battery temperature sensors to be monitored for circuit faults and, where possible, separate codes that point to the smallest replaceable part. With one temperature missing the controller has to assume the worst and limits charge and discharge power. The sensor sits inside the pack, so checks need 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 F at the sensing board
- PossibleFailed thermistor F
- 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.