Powertrain, generic · Hybrid propulsion

P0CE2 Hybrid/EV Battery Pack Coolant Control Valve A Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0CE2 points to a ground short on the drive circuit of coolant control valve A. In the 2011 Chevrolet Volt and 2016 Cadillac ELR, GM's four-port battery valve is moved by a small motor with two driver lines. The hybrid controller sets P0CE2 when driver line 1 reads low while the valve should be travelling in reverse, with system voltage above 9 V (2011) or 10.2 V (2016); 90 failed samples out of 100 at 6.25 ms create a Type B code, so the MIL comes on after two trips. As long as it is active, the valve performance test is blocked. Typical findings are a wire chafed against the body, water in the connector or an internal short in the valve motor. With the valve stuck in its last position, battery cooling or heating may be restricted. Short to voltage is P0CE3, open circuit P0CDF.

Likely causes

Driver wire chafed through and shorted to ground
Water or corrosion in the valve connector
Valve actuator motor internally shorted

Symptoms

  • MIL after two trips (GM)
  • Valve does not move, battery 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 awiring harnessbms

Related codes

P0CE3P0CDFP0CE0P0D1D

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