P0C86Hybrid/EV Battery Temperature Sensor F/G 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
- P0C86 compares the neighbouring battery temperature sensors F and G with each other. After the pack has rested, both should settle to nearly the same value; a persistent gap means at least one reads wrong although neither circuit is open or shorted. No manufacturer documents P0C86 publicly. GM and Mitsubishi test plausibility against the pack average instead and store the single sensor: GM's 2019 table 19OBDG02 uses a 25 °C margin for P0C34 (sensor 6) and P0C7D (sensor 7), Mitsubishi's 2018 Outlander PHEV 13 °C after 3,600 s soak. CARB lets manufacturers define the rationality checks for such inputs. If a real gap shows, uneven cooling between the two module groups deserves a look. The E/F pair is P0C72, G/H is P0C87.
- What you may notice
- Hybrid or EV warning lamp
- Somewhat reduced battery power
- Sensors F and G far apart in live data after a cold soak
- Likely causes
- LikelyThermistor F or G drifted without an electrical fault
- PossibleSensor F or G no longer in contact with its module
- PossibleReal temperature difference between the two module groups
- RareBattery management calibration with an overly narrow window
- 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.