P261F
Coolant Pump A Control Circuit Stuck On
The first coolant pump runs even when no command is active. Driver is stuck on or the wire is shorted to a permanent supply.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- ECU output driver stuck onCommon
- Control wire shorted to a permanent B+ supplyPossible
- Carbon or debris buildup preventing free movementLess likely
Parts involved
- Coolant Pump A
- Control Module
- Wiring Harness
P261F 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.