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SIB 33 03 18: Differential humming noise
Differential humming noise on N55/S55 engines (2015–2018); BMW explains the cause and the approved repair.
BMW service bulletin · NHTSA ID 10153753 · Jan 2019 · also written SI B33 03 18, B330318
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.
KNOCKING NOISE OR VIBRATION/DRONING NOISE FROM THE REAR AXLE. A hard knocking noise is heard from the rear axle area during load reversals. The tuning of the rear suspension mount for the differential.
Details
| Bulletin number | SIB 33 03 18 Also written: SI B33 03 18, B330318, 33 03 18, SIB-33-03-18, SI B330318 |
|---|---|
| NHTSA ID | 10152663, 10153753 (revisions) |
| Document IDs filed | B330318 |
| Type | Service bulletin |
| Date | (first filed Nov 2018) |
| Models | M2, M3, M4 |
| Model years | 2015–2018 |
| Chassis | F80, F82, F83, F87 |
| Engines | N55, S55 |
| Component (NHTSA) | Power Train › Axle Assembly Suspension Suspension › Rear Wheels |
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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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.