P261ECoolant Pump B Control Circuit Stuck On
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P261E covers the case where coolant pump B keeps working although the module has commanded it off. That can be an output that stays energised, a relay with welded contacts, or, on switchable mechanical pumps, a shroud or valve that no longer closes, so coolant circulates during warm-up. GM's 2014-2018 hybrid tables name P261E only in the flow-stuck-on fault bundle of the switchable water pump, which also blocks the thermostat check P0128; GM does not publish its threshold there. No other manufacturer documents P261E publicly. Its counterpart for pump A, P261F, is set by GM when the feedback speed stays high while the pump is off. A stuck-on pump slows warm-up, raises fuel use and can drain the battery after shutdown.
- What you may notice
- Engine warms up slowly, heater stays cool longer
- Pump audible after the engine is switched off
- Warning lamp and possibly a thermostat code
- Likely causes
- PossiblePump relay with welded contacts or output stage stuck on
- PossibleSwitchable pump shroud or vacuum/solenoid valve not closing
- RareControl line shorted to battery voltage
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.