P2D55Hybrid/EV Battery Pack Coolant Temperature Sensor C Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2D55 is the counterpart to P2D54: the signal of battery coolant temperature sensor C sits at or near the reference voltage. On an NTC circuit with pull-up that is what an open circuit produces, so the controller sees an impossibly cold coolant value. Typical findings are a connector not plugged back after battery work, a broken wire, a spread terminal, or a short to a supply line; an open sensor element is less common. No manufacturer documents P2D55 publicly. GM's sensor A equivalent P0C45 fails below -40 °C, at an ADC count above 3890 (2019) or 3823 (2011 Volt); either must persist for 1.75 of 2.5 s, Type B. CARB demands such out-of-range checks. Battery heating may not work properly in winter.
- What you may notice
- Live data shows about -40 °C for sensor C
- Battery heating or cooling uses substitute values
- Warning light; reduced power in cold weather possible
- Likely causes
- LikelyOpen circuit: connector unplugged, broken wire or spread terminal
- PossibleSignal wire shorted to a supply voltage
- RareOpen sensor element
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.