2025 BMW 5, 7, M Series Washer Pump Strainer Leaking TSB

Owners of certain 2025 BMW 5 Series, 7 Series, and M Series vehicles may notice a BMW washer fluid leak originating from the lower washer fluid reservoir. This issue is specifically addressed by BMW Technical Service Bulletin (TSB) SIB 61 05 26, issued on March 20, 2026.

This bulletin, SIB 61 05 26, provides guidance for diagnosing and correcting washer fluid leaks that manifest around the washer fluid pumps. The problem can lead to fluid loss and potentially impair the proper functioning of the entire washer system.

Symptoms

Customers might observe washer fluid leaking from the lower reservoir area of their vehicle. This leakage is typically most noticeable around the washer fluid pumps themselves, often indicated by visible fluid residue or staining.

Cause

The root cause of the BMW washer fluid leak is identified as a torn top rubber ring on the washer pump's filter. This damage can occur during the installation process if the pump's filter is inserted onto the washer fluid pump before the pump is installed into the reservoir.

Repair Procedure Summary

To resolve the washer fluid leak, technicians should follow a specific procedure outlined in TSB SIB 61 05 26. The repair involves replacing the faulty washer pump strainer(s) with an updated part.

1. Inspection: The first step is to thoroughly inspect the area around the washer fluid pump grommets for any signs of leakage, such as washer fluid residue staining.
2. Strainer Replacement: If a leak is confirmed, the technician will install a new, updated pump strainer. This process follows the detailed instructions in the REP - Remove and install/replace windshield washer pump 61 71 100 | REP-REP-P-6171100 procedure.
3. Correct Installation: A critical step is to ensure that the pump filter(s) are inserted into the washer fluid reservoir first. This prevents the damage to the rubber ring that causes the leak.
4. Final Assembly: The updated (blue) pump strainer(s) are then installed into the windshield washer fluid reservoir, followed by inserting the washer fluid pump into its rubber grommet.
5. Position Verification: After replacement, the pump's final position below the Z-rib must be verified, as shown in the bulletin's accompanying image.

Required Tools or Parts

To perform this repair, the following parts are specified:

• Strainer washer pump: Part Number 61 66 5 B83 629. This new part supersedes the older ETK/AIR P/N 61 66 5 A48 643. Up to three strainers may be required depending on the vehicle configuration.
• Windshield Washer Fluid: Either 35% RTU (Ready-To-Use) BMW Group pre-mix to -25 degrees F, or BMW Group concentrate, as needed to replenish the system.

Important Warnings

Owners and technicians should be aware that windshield washer fluid is a source of volatile organic compounds (VOCs). When these compounds evaporate into the atmosphere, they can contribute to poor air quality. It is important to adhere to any state or regional regulations regarding the allowable vehicle washer fluid solution mix.

Owner Action

If you are experiencing a BMW washer fluid leak from your 2025 BMW 5 Series, 7 Series, or M Series vehicle, it is recommended to schedule an appointment with an authorized BMW service center. They will be able to diagnose the issue, confirm if it aligns with TSB SIB 61 05 26, and perform the necessary repair using the updated washer pump strainer.

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Source: NHTSA ID: 11030307