2025-2026 Audi A5/Q5 P2BC100 Coolant Pump Blocked TSB

Symptoms of a Blocked Coolant Pump

Owners of 2025-2026 Audi A5 and Q5 models may experience specific warnings if the V188 coolant pump for the charge air cooler becomes blocked. The primary indicators include the illumination of the check engine light on the instrument cluster. Additionally, a critical message may appear: "Drive system: fault. Limited performance. Please contact workshop". This message suggests a reduction in vehicle performance and advises immediate professional attention.

Fault Codes (DTCs)

When the V188 coolant pump is blocked, the vehicle's Engine Control Module (-J623-, address word 0001) will log a specific diagnostic trouble code. The relevant DTC is:

This DTC P2BC100 directly indicates a malfunction with the V188 coolant pump, which is crucial for the charge air cooling system.

Technical Background and Trigger Conditions

The technical background for this issue points to extended periods of vehicle inactivity. Audi has observed that after a vehicle remains stationary for more than two months, the additional coolant pump V188 may occasionally become blocked. This blockage is a rare occurrence but can lead to the symptoms and fault code described. The TSB 2080825/1 specifically states that it only applies if the vehicle has previously remained stationary for an extended period, defined as more than two months.

Diagnosis and Repair Procedure Summary

If a blockage of the V188 coolant pump is indicated by an event memory entry, technicians should follow a specific diagnostic and repair process. The first step involves performing an output diagnostic test. During this test, an attempt should be made to activate the pump. Technicians are instructed to listen for an audible running noise from the pump. To facilitate this, it may be necessary to loosen the front left wheel housing liner for better access and sound detection.

If the pump is found to be running, and the fault code P2BC100 is logged only as intermittent in the event memory, the entry should be deleted. In such cases, replacing the pump is not necessary, as the blockage was temporary or resolved itself. However, if the pump is not working at all or is not running properly after activation attempts, it must be replaced to resolve the issue. This procedure ensures that the Audi A5 P2BC100 issue is correctly diagnosed and addressed.

Important Warranty Information

For vehicles experiencing the Audi A5 P2BC100 issue, warranty coverage is a key consideration. Audi Technical Service Bulletin 2080825/1 notes that if the vehicle is outside of its applicable warranty period, this bulletin serves as informational guidance only. All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual and are subject to review by Audi Warranty. The service number associated with this repair is 1947, and the damage code is 0040.

What Owners Should Do

If you own a 2025-2026 Audi A5 or Q5 and experience a check engine light or the "Drive system: fault. Limited performance. Please contact workshop" message, especially after your vehicle has been stationary for an extended period, it is recommended to contact your authorized Audi service center. Provide them with the symptoms you are experiencing. The technicians will be able to diagnose the issue, check for DTC P2BC100, and perform the necessary diagnostic and repair procedures as outlined in Technical Service Bulletin 2080825/1.

Source: NHTSA ID 11028466