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SIB 34 02 25: Coolant expansion tank leak
Coolant expansion tank leak on BMW G20/G22/G23/G26 and other models (2025); BMW repairs affected cars free under a service campaign.
BMW service campaign · NHTSA ID 11017082 · Apr 2025 · also written SI B34 02 25, B340225
What it covers
A service campaign is a fix BMW performs free on affected cars. Ask a BMW center whether it is open on your VIN.
Due to a manufacturing defect, there might be an internal leakage of the brake fluid expansion tank. In therare case that there is a leakage, the filling level sensor might malfunction over a relatively long period oftime .
Details
| Bulletin number | SIB 34 02 25 Also written: SI B34 02 25, B340225, 34 02 25, SIB-34-02-25, SI B340225 |
|---|---|
| NHTSA ID | 11017082 |
| Document IDs filed | B340225 |
| Type | Service campaign |
| Date | |
| Models | 330i, 430i, M240i |
| Model years | 2025 |
| Chassis | G20, G22, G23, G26, G42 |
| Engines | B46/B48, B58 |
| Component (NHTSA) | Service Brakes |
Model, year and engine coverage comes from NHTSA's records. Not every car in this range is affected; the official document lists the exact production dates and conditions.
More for these cars
Related bulletins
- SIB 32 04 26 Hydro Unit DSC Hydro Unit DSC on BMW G22/G23/G26 models (2027); BMW repairs affected cars free under a service campaign. Service campaign · Jul 2026
- SIB 34 02 26 Brakes warning message Brakes warning message on BMW G22/G23/G26 models (2026); BMW gives an inspection and repair procedure. Service campaign · Aug 2026
- NHTSA 11016435 Coolant expansion tank new-car delivery hold Coolant expansion tank new-car delivery hold on BMW G20/G22/G23/G26 and other models (2025); unsold cars were held for inspection and repair before delivery. Service campaign · Mar 2025
- SIB 34 05 17 Brakes ticking noise Brakes ticking noise on BMW G01/G02/G05/G06 and other models (2010–2021); BMW explains the cause and the approved repair. Service bulletin · Jul 2020
- SIB 34 03 20 Axle warning message Axle warning message on B46/B48/B58 engines (2019–2021); BMW gives an inspection and repair procedure. Service bulletin · Jun 2020
- SIB 34 10 20 Brakes ticking noise Brakes ticking noise on B46/B48/B58 engines (2019–2021); BMW explains the cause and the approved repair. Service bulletin · Oct 2020
Before you pay: check your VIN for recalls
Some failures are covered by a safety recall or a warranty extension. Our free recall check lists NHTSA recalls for your car's model and year.
Source: NHTSA Manufacturer Communications (public data). BimmerBench is not affiliated with BMW or NHTSA. The title and description above are our own plain-English summary; the full bulletin is BMW's document, linked above.