P26D2
Engine Coolant Pump Control Module Over Temperature
The smart coolant pump controller has reached over-temperature. Sustained high duty or insufficient cooling air flow.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Symptoms
- Check engine light on
- Cooling fan runs constantly or not at all
- Cabin heater weak or excessively hot
- Possible long warm-up time or hard cold start
Common causes
Ordered by how often each turns out to be the cause.
- Sustained high duty cycle from cooling demandCommon
- Cooling air channel blocked by debrisPossible
Parts involved
- Smart Coolant Pump Module
P26D2 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.