P0C8AHybrid/EV Battery Temperature Sensor I 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
- P0C8A records a sensor I voltage below the valid band. As the element is an NTC thermistor fed through a pull-up, a low voltage translates into a cell group that seems dangerously hot, typically caused by a short to ground. GM's 2012 Volt table (12OBDG01A) trips above 87.5 °C, an ADC count under 680, for 1.4 s within 2 s, two trips; the 2019 table 19OBDG02 instead fails above 160 °C in 8 of 10 samples, Type B. Bulletin 18-NA-342 assigns it to sensor 9 as the low-voltage fault. Mitsubishi's 2022 Outlander PHEV records a short of channel [08] under 0.12 V, above 125 °C, after 2 s and names the battery module or cell monitoring unit as the part to replace. P0C8B covers the open circuit, P0A7E a pack that really overheats.
- What you may notice
- Warning lamp with reduced power
- Sensor I shown extremely hot in live data
- Battery cooling running continuously
- Likely causes
- LikelySensor I signal shorted to ground
- PossibleThermistor I shorted, for example after coolant or moisture entry
- RareCell monitoring unit input for sensor I faulty
- 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.