What are the common causes of P261A?

An open in the coolant pump B control circuit wiring. A failed coolant pump B. A loose or corroded connector on the pump B circuit. A blown fuse feeding the coolant pump B.

Read coolant pump B commanded status on a scan tool. Test the pump B control circuit for an open. Check the pump B fuse and relay. Inspect the pump B connector. Replace coolant pump B if power and ground test good. Clear the code and retest.

P261A

Coolant Pump B Control Circuit/Open

System: Computer output circuits (P code)
Lamp: Check Engine Light
Category: Powertrain - Computer and Auxiliary Controls

What it means

P261A means Coolant Pump B Control Circuit/Open.

Where it lives

For P261A, the circuit described runs through the pump. The description of P261A reports the pump as open.

Check these first

An open in the coolant pump B control circuit wiring
A failed coolant pump B
A loose or corroded connector on the pump B circuit
A blown fuse feeding the coolant pump B

What to do next

Read coolant pump B commanded status on a scan tool
Test the pump B control circuit for an open
Check the pump B fuse and relay
Inspect the pump B connector
Replace coolant pump B if power and ground test good
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.