Code Definition

P261A — Coolant Pump 'B' Control Circuit / Open

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P261A

P261A is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P261A is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P261A is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

Coolant pump B is the secondary or auxiliary electric coolant pump, as distinct from the primary pump that circulates coolant through the engine. Depending on the design it runs coolant through the turbocharger bearing housing after shutdown to prevent oil coking, feeds the cabin heater core while the engine is stopped, circulates coolant through the EGR cooler or charge air cooler circuit, or manages a hybrid or battery cooling loop. The engine control module or an auxiliary coolant pump module commands the pump through a relay or a solid state driver and monitors that control circuit, and P2...

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