P0C71Hybrid/EV Battery Temperature Sensor D/E Correlation
- 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
- P0C71 checks whether battery temperature sensors D and E agree with each other. Both sit in the same pack, so after a long soak they should report almost the same value; a lasting gap means one of them reads wrong although its circuit looks healthy. No manufacturer documents P0C71 publicly. GM and Mitsubishi run this plausibility test against the pack average instead and log the single sensor: on the eAssist cars (13OBDG05C) GM flags sensor 4 (P0AE9) or sensor 5 (P0BC3) beyond 8.55 °C after more than 21,600 s off, Type B, while the 2022 Outlander PHEV tolerates 13 °C after one hour. P0C70 covers the C/D pair and P0C72 the E/F pair; open or shorted sensors set their own circuit codes.
- What you may notice
- Hybrid or EV system warning lamp
- Reduced battery charge and discharge power
- Battery cooling running more often than usual
- Likely causes
- LikelyThermistor D or E drifted while staying inside its electrical range
- PossibleSensor no longer pressed against its cell or module
- PossibleGenuine temperature difference from uneven cooling or a weak cell group
- RareBattery management software with an overly tight comparison
- 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.