P0C89Hybrid/EV Battery Temperature Sensor I Circuit Range/Performance
- 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
- P0C89 says sensor I delivers an electrically valid but implausible temperature. GM checks it against the average of the remaining sensors: the 2019 table 19OBDG02 fails it beyond 25 °C in 50 of 67 samples, Type B, two trips, and suspends the test while a low, high or communication fault is present; the 2016 Cadillac ELR table (16OBDG01) uses 20 °C. Bulletin 18-NA-342 calls it sensor 9 performance on the Volt and lists it among the codes cured by reprogramming the hybrid powertrain control module 2. Mitsubishi's 2018 Outlander PHEV treats it as rationality of channel [08], one check per drive after an hour parked, with a 13 °C limit held for 0.32 s. If a software update does not help, a misplaced or drifting thermistor is the likely cause.
- What you may notice
- Check-engine or hybrid lamp, often after a long rest
- Battery power reduced
- Likely causes
- LikelyThermistor I drifted within its electrical range
- PossibleModule software setting the code falsely, fixed by reprogramming (GM Volt)
- PossibleSensor I displaced from its measuring point
- RareReal local heating at the cell group of sensor I
- 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: €80 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.