P261B
Coolant Pump B Control Circuit Performance/Stuck Off
The second electric coolant pump is commanded on but does not run. Cooling demand of the connected loop is not satisfied.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Pump motor seized by sedimentCommon
- Cracked rotor magnet decouples drivePossible
- Carbon or debris buildup preventing free movementLess likely
Parts involved
- Coolant Pump B
- Pump Motor
P261B 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.