Fault-Code Library · Cooling system
P261A: Coolant pump B control circuit open
The ECU detects an open circuit in an auxiliary or electrically driven coolant-pump circuit.
Common symptoms
- •Cooling warning
- •Poor cabin heat
- •Overheating after shutdown
- •Reduced power
Likely causes
- •Failed auxiliary pump
- •Open wiring
- •Connector corrosion
- •Fuse or control-module fault
First checks
- •Identify the vehicle-specific pump B location
- •Command the pump with diagnostics
- •Check power, ground, and circuit continuity
Important
Pump B serves different circuits by model; confirm whether it cools the engine, turbo, charge cooler, or heater.
A fault code identifies a detected condition, not a failed part. Confirm manufacturer-specific subcodes and live data.
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