Powertrain, generic · Hybrid propulsion

P0C32 Hybrid/EV Battery Cooling System A Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0C32 is the functional check of the battery thermal system that CARB asks for. GM tunes it per vehicle: the 2012 Volt (12OBDG01A) fails it when the average pack temperature stays above 40 °C in active cooling or below −17 °C in active heating, after 4200 s or 9000 s, Type A, one trip. The Two-Mode trucks (12OBDG06) compare the hottest module with a limit that rises with inlet temperature, from 45 °C to about 65 °C, Type B. The air-cooled eAssist (13OBDG05C) models the power pack temperature after six hours off and fails above 15 °C deviation, Type B. GM bulletin PIP4992C links P0C32 on 2012–2016 eAssist cars to a pack fan that stops at low 12 V voltage and calls for reprogramming and fan replacement. B and C circuits use P2D3F and P2D40.

Likely causes

Battery cooling fan stopping at low 12 V system voltage (GM eAssist)
Low coolant, air or a weak pump in a liquid-cooled pack circuit
Blocked cooling air intake or ducts of an air-cooled pack
Failed pack heater or chiller valve

Symptoms

  • MIL and hybrid system warning
  • Reduced electric range or assist
  • Charging system or battery warning message (eAssist)

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–1,500
Time0.5–4 h

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

Parts involved

hv battery cooling system abattery pack coolant loop

Related codes

P0A7EP2D3FP2D40P0C44P0AAD

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov.