P2D52Hybrid/EV Battery Pack Coolant Temperature Sensor C Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2D52 is the general circuit code for a third coolant temperature sensor, C, in the liquid loop of a hybrid or EV battery. Sensors A and B are commonly the pack inlet and outlet; where C sits is not published and depends on the design. The code says only that the signal is unusable, without saying whether it lies under or over its limits. No manufacturer documents P2D52 publicly. The closest published case is sensor A: Volvo stores the general code P0C4200 in the battery control module of the XC90 T8 from 2016, and technical journal TJ 33546 has the workshop confirm the latest software and then simply clear it. CARB requires battery thermal management inputs to be monitored. Without this value the controller may limit charging or power.
- What you may notice
- Check engine or hybrid system light
- Battery heating or cooling not working as expected
- Charging or electric power may be limited
- Likely causes
- LikelyLoose connector, damaged wire or corroded pin in the sensor C circuit
- PossibleFailed coolant temperature sensor C
- RareBattery controller software flagging the circuit wrongly (update)
- 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.