P0C8FHybrid/EV Battery Temperature Sensor J Circuit Low
- 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
- P0C8F means the voltage on sensor J has dropped below its valid window. The NTC thermistor is powered via a pull-up resistor, so a grounded signal line reads as an absurdly hot cell group; low refers to the signal. GM's HPC2 table of 2019 (19OBDG02) converts the voltage and fails the test if the result is over 160 °C for 8 samples out of 10, sampled every 100 ms and rated Type B. The older 2012 Volt table judges all sensors together and fails them above 87.5 °C (raw count under 680) for 1.4 s of a 2 s window. On the 2018 Outlander PHEV, Mitsubishi logs a short of sensor [09] once the signal remains below 0.12 V, hotter than 125 °C, for 2 s. A genuinely overheating pack would instead set P0A7E. Expect reduced power and battery cooling running hard.
- What you may notice
- Warning lamp with clearly reduced electric power
- Battery fan or chiller running constantly
- Engine starts more often on plug-in hybrids
- Likely causes
- LikelySensor J signal wire chafed and shorted to ground
- PossibleThermistor J shorted internally, for example after moisture
- RareMonitoring board input pulling the line low
- 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.