Powertrain, generic · Hybrid propulsion

P0CE6 Hybrid/EV Battery Pack Coolant Control Valve Position Sensor Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0CE6 reports that the position feedback of the battery coolant control valve has fallen below its permitted window. GM expresses the signal relative to the reference voltage: the 2011 Chevrolet Volt fails it below 5 % in 40 of 50 samples at 100 ms, the 2016 Cadillac ELR below 28 % in 640 of 800 samples at 6.25 ms, a value under the lowest end stop the ELR accepts during learning (just over 30 %). Both are Type B, so the MIL comes on after two trips, and while the code is active the valve performance test is suspended. A short of the signal wire to ground, a missing reference voltage or a defective sensor track in the actuator are the likely causes. The controller can then no longer position the valve reliably. The high fault is P0CE7, plausibility P0CE5.

Likely causes

Feedback signal wire shorted to ground
Sensor reference voltage missing or open
Worn or defective sensor track in the actuator

Symptoms

  • MIL after two trips (GM)
  • Valve position shown as near 0 % in live data

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

P0CE7P0CE4P0CE5P0CE8

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