Headline failures on the S55 3.0L twin-turbo I6 (F80/F82/F87 M, 2014–2021)
The S55 is built for track duty and the failure modes reflect that. The headline issue is the crank hub — a documented problem across M3/M4 model years that throws P0011/P0014 cam-timing codes when it slips. Charge-pipe blow-off under hard use produces 30FF boost codes. Per-cylinder misfires (P0301–P0306) on the S55 should be inspected for both coil and injector failure, as the S55’s higher-output fuel system is harder on injectors than the N55 road-car variant.
Codes to scan for
| Code | Title |
|---|---|
| 120308 | Charging pressure control: too low (B58) |
| 30FF | Turbocharger, charge-air pressure too low (underboost) |
| 2A82 | VANOS intake control fault |
| P0128 | Coolant temp below thermostat regulating temperature |
| P0300 | Random/multiple cylinder misfire detected |
| P0301 | Cylinder 1 misfire detected |
| P0302 | Cylinder 2 misfire detected |
| P0303 | Cylinder 3 misfire detected |
| P0304 | Cylinder 4 misfire detected |
| P0305 | Cylinder 5 misfire detected |
| P0306 | Cylinder 6 misfire detected |
| P0171 | System too lean (Bank 1) |
About the S55 3.0L twin-turbo I6 (F80/F82/F87 M, 2014–2021)
The full engine profile documents every supported parameter, query path and decoder for the S55. Verification status, common failure modes and chassis-specific notes are documented there.
Related
- DTC by engine index — codes for every engine.
- S55 engine profile — parameter catalog and verification status.
- K+DCAN diagnostics — cable and protocol setup for E-series.
- ENET / DoIP diagnostics — cable and protocol setup for F/G-series.
- BMW fault codes guide — how to interpret DTC evidence.