Powertrain, generic (extended)

P2D53 Hybrid/EV Battery Pack Coolant Temperature Sensor C Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Sensor C drifting or reacting slowly
Plausibility limits in the controller software too tight (update)
Contact resistance in the connector or air pocket at the sensor

Symptoms

  • Warning light, often after the car has stood for hours
  • No obvious driveability change at first
  • Battery conditioning less effective

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–700
Time0.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

hv battery pack coolant temp sensor cwiring harnessbms

Related codes

P2D52P2D56P2D2BP0C43P0CD6

References: law.cornell.edu, gsi.ext.gm.com, static.nhtsa.gov.