Powertrain, generic (extended)

P2D52 Hybrid/EV Battery Pack Coolant Temperature Sensor C Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Loose connector, damaged wire or corroded pin in the sensor C circuit
Failed coolant temperature sensor C
Battery controller software flagging the circuit wrongly (update)

Symptoms

  • Check engine or hybrid system light
  • Battery heating or cooling not working as expected
  • Charging or electric power may be limited

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

P2D53P2D54P2D55P0C42P0CD5

References: law.cornell.edu, static.nhtsa.gov.