P0ACBHybrid/EV Battery Temperature Sensor C 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
- With P0ACB the controller judges battery temperature sensor C implausible: its value deviates too far from what the other pack sensors report. GM applies the same limits as for sensors A and B. In the 2016 and 2019 tables the threshold is more than 25 °C away from the average of the other sensors in 50 of 67 samples; the 2011 and 2013 two-mode tables use more than 15 °C in 90 of 100; the 2013 table 13OBDG05C uses 8.55 °C after a soak of more than 6 hours. All are Type B, two trips. The Volt bulletin 18-NA-342 includes P0ACB among codes corrected by software. Without a bulletin, compare all sensors after an overnight soak to see whether only sensor C stands out.
- What you may notice
- Check engine or hybrid warning light
- Sensor C reads clearly off the others after a long soak
- Possibly reduced charge and drive power
- Likely causes
- LikelySensor C drifted from its characteristic
- PossibleController software flags the sensor falsely (GM Volt bulletin 18-NA-342)
- PossibleCorroded terminal adding resistance
- RareReal temperature difference in the module monitored by sensor C
- 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: €60 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.