P261B on BMW: How to Diagnose & Fix
Coolant Pump "B" Control Circuit Range/Performance
1 BMW model · 1 documented issue · 1 critical
P261B on BMW by model: symptoms, diagnosis and fix
BMW SIB 01 13 21 identifies 2012-2013 E92/E93 335i, 335is and 335i xDrive Coupe vehicles with N54T or N55 engines in the electric coolant-pump settlement population. The bulletin provides a diagnosis-and-repair path when a warning or fault is present; it does not call for preventive replacement on every N55 3 Series.
Common Symptoms
- Engine warning lamp
- Engine-overheat warning
- Reduced-power operation may accompany overheating
How to Fix
Stop safely if an overheat warning appears and avoid continued operation until the cooling system is checked. Verify the chassis, engine and VIN, read fault memory and follow the current coolant-pump test plan before replacement. Settlement benefits were time-limited.
Sources for this issue (1)
P261B code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P261B mean on a BMW?
P261B stands for "Coolant Pump "B" Control Circuit Range/Performance." This code sets when the engine control module commands the electric (auxiliary) coolant pump "B" but the circuit's behavior or feedback does not match what is expected for the commanded state. Coolant pump "B" is typically an electric auxiliary pump that helps circulate coolant for engine, turbo, hybrid, or A/C-related cooling. A range/performance fault means the pump or its control circuit is responding sluggishly or incorrectly, which risks overheating if coolant is not moving properly. On BMW it is documented across 1 model: 3 Series.
What are the most common causes of P261B?
The most common causes of P261B are: Failing or seized electric auxiliary coolant pump, Wiring or connector fault in the pump control circuit, Corroded or loose pump connector, Low coolant level or air in the system, Faulty pump relay or power supply, Control module (ECM) driver fault (less common). The specific cause varies by vehicle.
How much does it cost to fix P261B on a BMW?
Repair costs vary widely with the root cause and BMW model; each issue on this page carries its own estimate where one is published.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.