Powertrain, generic · Hybrid propulsion

P0CC2 Drive Motor A Coolant Pump Control Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0CC2 judges whether the pump for drive motor A actually moves coolant, not only whether its wiring is intact. GM's 2013 eAssist table 13OBDG05C infers flow from temperature: when the model predicts more than 17 °C between the jacket coolant of the motor generator and the coolant reaching the loop sensor, a running pump should make the sensor warm up quickly. If its rate of change stays at 0.25 °C per second or less 20 s after the pump was switched on, the test fails, Type B, two trips, with over 10 V supply. The check is blocked by pump circuit codes P0CC1/P0CC3/P0CC4, by the loop sensor codes P0CBD to P0CBF and by stator sensor codes P0A2B to P0A2D. A seized or air-locked pump, low coolant or a blocked hose are typical; CARB section (e)(15.2.2) requires such functional checks of output components.

Likely causes

Air in the motor generator cooling loop, often after service
Worn or seized pump impeller
Low coolant level or kinked or blocked hose

Symptoms

  • Check-engine lamp
  • Electric assist reduced as the motor generator heats up

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–700
Time0.5–3 h

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

Parts involved

drive motor a coolant pumpwiring harnesshybrid control module

Related codes

P0CC1P0CC3P0CC4P0CBDP0A2FP0C73

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