Powertrain, generic · Hybrid propulsion

P0CEA Hybrid/EV Electronics Coolant Pump A Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

Here the pump circuit is electrically intact, yet the coolant it should move does not seem to arrive. GM documents it in the VICM tables of 2014 and 2016, the latter explicitly for the Cadillac ELR: with the pump enabled above 30 % speed for more than 300 s, the controller compares the power electronics coolant temperature with the temperature of the high-voltage charger. A gap larger than a calibrated value, separate for charging and for driving, or a charger hotter than 60 °C for over 600 s while charging counts as a failure; 32 of 40 samples at 250 ms set the code, Type B, two trips. Circuit faults (P0CE9, enable line) block the test. Weak flow from air in the loop, low coolant or a worn pump is the usual background; charging and drive power are cut back to protect the electronics.

Likely causes

Air trapped in the power electronics coolant loop after service or a leak
Low coolant level in the electronics loop reservoir
Worn or partly blocked pump delivering too little flow
Skewed coolant or charger temperature signal distorting the comparison

Symptoms

  • Malfunction indicator lamp or hybrid system message
  • Charging slows down or stops, especially in hot weather
  • Reduced propulsion power during long or demanding drives

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

hybrid electronics coolant pump awiring harnesshybrid control module

Related codes

P0CE9P0CEDP0CEFP2B2AP2E42

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