P0ACDHybrid/EV Battery Temperature Sensor C Circuit High
- 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
- P0ACD indicates that battery temperature sensor C reports a voltage above its plausible range, which an NTC sensor translates into extreme cold. Common reasons are an open circuit, a pin backed out of the sensing board connector or a cracked thermistor. GM sets the code below -69 °C in 8 of 10 samples in its 2016 and 2019 tables, below -45 °C in 30 of 40 on the 2011 and 2013 two-mode hybrids, and above 4.63 V, about -45 °C, in 7 of 10 in the 2013 table 13OBDG05C; Type B, two trips. On the Chevrolet Volt, bulletin 18-NA-342 ties it to a false Battery Too Cold message and a reprogramming fix. A seemingly frozen pack is heavily limited in charge and discharge.
- What you may notice
- Check engine or hybrid warning light
- Battery too cold message in mild weather
- Strongly reduced charging and electric power
- Likely causes
- LikelyOpen signal or return wire of sensor C
- PossibleThermistor open or cracked
- PossibleController software issue on the Volt (bulletin 18-NA-342)
- 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.