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SIB 18 01 25: Discolorization of exhaust system rear silencer
Discolorization of exhaust system rear silencer on B46/B48 engines (2024–2025); BMW explains the cause and the approved repair.
BMW service bulletin · NHTSA ID 11033031 · May 2026 · also written SI B18 01 25, B180125
What it covers
A service bulletin tells BMW technicians how to diagnose or fix a known issue. It is not a recall: a repair under a bulletin is normally paid by the owner unless the car is still under warranty or a warranty extension applies.
Discolorization of exhaust system rear silencer
Details
| Bulletin number | SIB 18 01 25 Also written: SI B18 01 25, B180125, 18 01 25, SIB-18-01-25, SI B180125 |
|---|---|
| NHTSA ID | 11014423, 11033031 (revisions) |
| Document IDs filed | B180125 |
| Type | Service bulletin |
| Date | (first filed Feb 2025) |
| Models | 230i, X1, X2 |
| Model years | 2024–2025 |
| Chassis | G42, U10, U11 |
| Engines | B46/B48 |
| Component (NHTSA) | Power Train Structure › Body |
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.
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Related bulletins
- SIB 28 01 24 Transmission corrosion Transmission corrosion on B46/B48 engines (2024); BMW repairs affected cars free under a service campaign. Service campaign · Aug 2024
- SIB 28 02 24 Transmission corrosion Transmission corrosion on B46/B48 engines (2022–2024); BMW repairs affected cars free under a service campaign. Service campaign · Dec 2024
- SIB 28 01 25 Transmission warning message Transmission warning message on B46/B48 engines (2024–2026); BMW gives an inspection and repair procedure. Service bulletin · Jan 2026
- SIB 28 01 23 Transmission warning message Transmission warning message on B46/B48 engines (2022–2025); BMW gives an inspection and repair procedure. Service bulletin · Mar 2025
- SIB 06 31 25 Inspection and Return - Output Drive Repair Kit Inspection and Return - Output Drive Repair Kit on B46/B48 engines (2024); BMW gives an inspection and repair procedure. Other communication · May 2025
- SIB 61 03 23 Electrical system ticking noise Electrical system ticking noise on B46/B48 engines (2016–2023); BMW explains the cause and the approved repair. Service bulletin · Apr 2024
Before you pay, check the VIN for recalls. Some failures are covered by a safety recall or a BMW warranty extension.
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.