Powertrain, generic · Hybrid propulsion

P0DE8 Hybrid/EV Battery Pack Coolant Control Valve C Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0DE8 reports an open or otherwise faulty drive circuit for coolant control valve C, a third switchable valve in the coolant loop of the hybrid or EV battery. What it switches depends on the layout, for example whether coolant passes through the radiator, the air-conditioning chiller or a heater, and the maker decides which valve is called C. No manufacturer documents P0DE8 publicly. The closest documented case is valve A: the battery management of Mercedes S-, E- and C-Class hybrids flags its actuation as electrically faulty or open with P0CDF00 (LI83.30-P-061224). CARB demands circuit checks on every output used to heat or cool the energy store. Expect a broken wire, a loose plug or an open coil. Shorts are P0DEB and P0DEC, an overloaded driver P0E22.

Likely causes

Broken wire or loose connector at valve C
Open coil or motor winding inside valve C
Corroded pins from coolant or water ingress
Failed driver stage in the controlling module

Symptoms

  • Battery temperature control works only in a fallback mode
  • Charging or drive power reduced when the pack is too hot or cold
  • Malfunction indicator lamp on

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–700
Time0.5–3 h

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

Parts involved

hv battery pack coolant valve cwiring harnessbms

Related codes

P0DEBP0DECP0DE9P0E22P0D1AP0CDF

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