OBD-II reference

All 9.533 generic OBD-II codes, explained in detail.

Causes, inspection steps and sources — a comprehensive DIY archive. Created and maintained with love for the detail. Good luck and have fun!

Powertrain generic / SAE

P0CEC

Hybrid/EV Electronics Coolant Pump A Control Circuit High

The hybrid electronics coolant pump A reports a control circuit high condition. Power electronics cooling may be impaired.

SystemPowertrain
Typegeneric / SAE
GroupP0
Range / numberC / EC

Possible causes

  • Wire shorted to B+ high
  • Open motor medium
  • Connector pins corroded - high contact resistance low

Inspection / repair

  • Difficulty: hard
  • DIY: shop recommended
  • Estimated cost: 300–1800 €
  • Estimated time: 2–7 h
  • Component: hybrid electronics coolant pump a
  • Component: wiring harness
  • Component: hybrid control module
  • MIL / check engine light
  • limp mode possible

Sources

References

How to read OBD-II codes

The first letter names the vehicle system, the second digit distinguishes generic from manufacturer-specific, the remaining digits group fault area and number.

PPowertrain: engine, transmission, emissions
BBody: chassis trim, comfort, interior
CChassis: suspension, brakes, steering
UNetwork: CAN, control modules, communication