P0C88Hybrid/EV Battery Temperature Sensor I Circuit
- 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
- P0C88 is the general circuit code for battery temperature sensor I, chosen when the fault is electrical but not classified as low, high or erratic. No manufacturer documents P0C88 publicly. In GM's Volt pack sensor I is the ninth and last thermistor (bulletin 18-NA-342); the 2012 Volt table 12OBDG01A and GM's later tables cover it only through the specific codes P0C89 to P0C8C. Packs with more sensors, such as Mitsubishi's Outlander PHEV with 50, carry the letter as channel [08]. CARB section (e)(15.3.1) requires continuous range and continuity checks on such inputs. With channel I unreliable, the battery controller falls back to cautious power limits. Older code lists show this number as reserved, so some scan tools may not name it.
- What you may notice
- Hybrid or EV warning lamp
- Reduced electric power
- Generic scan tools may show the code without a description
- Likely causes
- LikelyConnector fault on the sensor I circuit
- PossibleThermistor I failed
- RareDefective input channel in the battery sensing electronics
- 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.