P2600 on BMW: How to Diagnose & Fix
Coolant Pump "A" Control Circuit/Open
1 BMW model · 1 documented issue · 1 critical · $900-$3,300 repair
P2600 on BMW by model: symptoms, diagnosis and fix
The 2012-2018 640i uses the N55 inline-six with an electric main coolant pump that is a known wear item across every N55 application. On 6Post, 640i owners report failures around 60,000-100,000 miles: sudden high-temperature warnings, reduced-power mode, the pump running continuously after shutdown, or a stored coolant-pump fault. Because the pump is electronic it usually fails without the whining or weeping a mechanical pump gives, and overheating can follow quickly. The V8 650i's N63 does not share this pump.
Common Symptoms
- Engine temperature warning / overheating
- Reduced engine power message
- Water pump runs continuously after shutdown
- Coolant pump fault stored in DME
How to Fix
Replace the electric water pump together with the thermostat (they are usually done as a set). Genuine pump is $500-$600; independent shops charge roughly $900-$1,300 all-in while dealer estimates for a 640i run $1,900-$3,300. Many owners replace preventively around 80,000 miles. No recall for the main pump itself.
Sources for this issue (3)
P2600 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 P2600 mean on a BMW?
P2600 stands for "Coolant Pump "A" Control Circuit/Open." The PCM commands the auxiliary/electric coolant (water) pump 'A' but detects an open in its control circuit — essentially no electrical continuity, as if a wire were cut, a connector unplugged, a fuse blown, or the relay failed. The pump cannot be driven, so the module sets this code. On BMW it is documented across 1 model: 6 Series.
What are the most common causes of P2600?
The most common causes of P2600 are: Open or broken wiring in the coolant pump control circuit, Corroded, loose, or unplugged pump connector, Failed coolant pump relay or blown fuse, Failed electric coolant pump (internal open winding), PCM driver circuit fault. The specific cause varies by vehicle.
How much does it cost to fix P2600 on a BMW?
Published repair estimates on BMW range from $900 to $3,300 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P2600 on a different make?
View P2600 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.