Powertrain, generic · Hybrid propulsion

P0CE4 Hybrid/EV Battery Pack Coolant Control Valve Position Sensor Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0CE4 is the general circuit fault of the position feedback from the battery coolant control valve. On motor-driven valves the actuator reports its actual position as a share of the sensor supply voltage, letting the controller confirm that coolant really flows toward the battery, chiller or heater. GM's Volt and ELR monitor this feedback but report its electrical faults as P0CE6 and P0CE7; no manufacturer publicly documents P0CE4 itself. CARB requires battery thermal management inputs to be checked for circuit faults. Likely causes are an open signal, reference or ground wire, a damaged connector at the valve or a failed sensor inside the actuator, which is normally replaced together with the valve. Without feedback the controller may park the valve and limit charging or power. Implausible positions are P0CE5.

Likely causes

Open signal, reference or ground wire of the position sensor
Damaged or corroded connector at the valve
Position sensor inside the valve actuator failed

Symptoms

  • MIL or hybrid system warning
  • Valve held in a default position, thermal conditioning limited

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–600
Time0.5–3 h

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

Parts involved

hv battery pack coolant valve position sensorwiring harnessbms

Related codes

P0CE5P0CE6P0CE7P0CE8P0CDF

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