P0C87Hybrid/EV Battery Temperature Sensor G/H 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
- P0C87 checks that battery temperature sensors G and H tell a consistent story. The controller would set it when, after enough rest for the pack to equalise, the two values remain apart by more than a calibrated margin. No manufacturer documents this pair code publicly. In the Volt, GM numbers G and H as sensors 7 and 8 and, in its 2012 table 12OBDG01A, compares each one with the average of the others after more than 21,600 s off, failing it beyond 25.3 °C as P0C7D or P0C82, Type B. Mitsubishi's 2022 Outlander PHEV logs sensors [06] and [07] the same way against a 13 °C limit. A pair code cannot say which of the two is wrong, so live data after a cold soak decides. The neighbouring pair code is P0C86 (F/G).
- What you may notice
- Hybrid or EV warning lamp
- Reduced charge and discharge power
- Likely causes
- LikelyThermistor G or H drifted while staying in range
- PossibleSensor G or H detached from its cell group
- PossibleReal temperature gap from a weak cell group or blocked cooling
- RareBattery module software needing an update
- 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.