Powertrain, generic · Hybrid propulsion

P0DEC Hybrid/EV Battery Pack Coolant Control Valve C Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0DEC is the short-to-voltage case for coolant control valve C: its drive line reads high at a moment when the controller expects it low. No manufacturer documents P0DEC publicly. For valve A, GM's 2011 Volt checks driver line 1 for a high level while the valve should be stopped or moving forward, again needing 90 failures in 100 checks for a Type B code. Unlike a ground short, a line held at supply voltage can keep the valve energised, so the valve may creep to an end stop instead of freezing. Keep the drive circuit apart from the feedback: on valves with a position sensor, a signal above the valid range is a sensor code such as P0CE7, not P0DEC. A wire pinched against a live feed or a driver that will not switch off is typical. Short to ground is P0DEB, open circuit P0DE8.

Likely causes

Wire pinched against a supply line
Driver stage in the module not switching off
Moisture bridging pins in the connector

Symptoms

  • Valve C runs to an end position and stays there
  • Pack temperature drifts, power or charging limited
  • 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

P0DEBP0DE8P0E22P0D1EP0CE3P0CE7

References: gsi.ext.gm.com, law.cornell.edu.