P261A on 2005-2023 Audi A6 — Coolant Pump "B" Control Circuit/Open
1 vehicles · 1 makes · $800-$1,500 repair
How to diagnose and fix P261A: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Audi A6 · 2005–2023
Water pump failures are common across all A6 generations due to plastic impeller degradation and seal leaks. Audi uses plastic impellers that crack or disintegrate over time (typically 80,000-120,000 miles), causing coolant leaks and overheating. The water pump is often driven by the timing belt or timing chain, so replacement is recommended during timing service to save labor. Thermostat housings also crack due to heat cycling, causing coolant leaks and erratic temperature readings. Symptoms include coolant leaks under the car, overheating in traffic, temperature gauge fluctuations, and coolant warning lights. Ignoring a failed water pump can lead to severe engine overheating, warped cylinder heads, and blown head gaskets ($3,000-$5,000 repair). Some models have electric auxiliary water pumps that also fail, causing poor heater performance.
Common Symptoms
- Coolant leak under front of car (pink/green puddle)
- Overheating in stop-and-go traffic or at idle
- Temperature gauge rising above normal (middle position)
- Coolant warning light or low coolant message
- No heat from cabin heater (auxiliary pump failure)
- Hissing or gurgling noise from engine bay
- Steam or coolant smell from engine
How to Fix
Replace water pump AND thermostat together ($800-$1,500 with labor). Always use OEM or high-quality aftermarket parts (Rein, Hepu) and avoid cheap pumps. If water pump is timing belt/chain driven, replace during timing service to save labor. Flush cooling system and refill with the Audi coolant specified for the vehicle (G12++ and G13 are fully compatible; mixing other types reduces corrosion protection, so check Audi's mixing chart). Inspect coolant hoses and replace if cracked. If auxiliary electric water pump fails, replace separately ($300-$600). Monitor coolant level weekly and address leaks immediately to prevent overheating damage.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Beck/Arnley 131-2517 main engine water pumpCross-refBeck/Arnley 131-2517
Confirm VIN and current fitment before ordering; this is not an auxiliary water pump.
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Owner tips & cautions
- TipPhotograph the suspected leak before cleaning it, then recheck after the system is filled and the car is driven. The Audi bulletin requires the leak to be reproduced rather than inferred from old residue.
- WarningConfirm that the failed component is the main engine coolant pump. The A6 also has auxiliary pumps, and those are different parts with different repair roles.
Sources for this issue (2)
Find P261A by make
Browse every documented model and issue for your make.
P261A 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 P261A mean?
P261A stands for "Coolant Pump "B" Control Circuit/Open." This code sets when the engine control module detects an open (broken) circuit in the control wiring for electric coolant pump "B," an auxiliary pump that circulates coolant for engine, turbo, hybrid, or A/C cooling. An open circuit means the computer cannot drive the pump at all, so coolant may not move when needed. If the pump cannot run, the affected component can overheat, making this an important code to address promptly.
What are the most common causes of P261A?
The most common causes of P261A are: Open or broken wire in the pump control circuit, Disconnected or corroded pump connector, Failed electric auxiliary coolant pump, Faulty pump relay or loss of power feed, Poor ground connection, ECM/PCM driver fault (less common). The specific cause varies by vehicle.
How much does it cost to fix P261A?
Repair costs for P261A range from $800 to $1,500, depending on the vehicle and root cause.
Which vehicles are affected by P261A?
Au7o has documented P261A across 1 vehicle models from 1 manufacturers: Audi.
Join 700+ subscribers following Au7o for vehicle insights and updates.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.