P2D53Hybrid/EV Battery Pack Coolant Temperature Sensor C Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2D53 means coolant temperature sensor C of the battery loop delivers an electrically valid value that does not fit its surroundings. Unlike P2D2B, which only sees that sensors A and B disagree, this code blames sensor C itself. No manufacturer documents P2D53 publicly. GM's 2019 table 19OBDG01 shows the analogous test for sensor A (P0C43): after the HV contactors and battery heater have stayed off for 14,400 s or longer, the inlet value is compared with average cell temperature and outside air and fails at 23 °C or 22 °C difference, 8 s within 10 s, Type B. Audi's 2020 Q5 TFSI e set P0C4300 without a defect because the thermal management limits were too tight; software campaign NVLW fixed it. CARB demands such rationality checks.
- What you may notice
- Warning light, often after the car has stood for hours
- No obvious driveability change at first
- Battery conditioning less effective
- Likely causes
- LikelySensor C drifting or reacting slowly
- PossiblePlausibility limits in the controller software too tight (update)
- PossibleContact resistance in the connector or air pocket at the sensor
- 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.