KNOWN FAULTS · BMW

BMW M2 (F87) M2 Competition / CS (S55, 3.0) common problems.

2016–2021 · Petrol

Sources are not verified in real time and no entry confirms that your car is affected.

1 known fault with sources

S55 crank hubValve timing

Engine / equipment: S55 3.0 twin-turbo (M3 F80, M4 F82/F83, M2 Competition and CS F87)
Period mentioned: 2014–2021
Symptoms: Engine or drivetrain warning, rough running, or the engine cranks but won't start because the ECU blocks it after detecting timing deviation.
Possible cause described: The crank hub that drives the chain is held only by friction from one bolt, with no key. Under high load (aggressive high-rev downshifts or extra power from tuning) it can slip and throw the timing out, risking valve-to-piston contact. It is more common on modified cars.
Check for the garage: Read camshaft deviation with a diagnostic tool and check whether the hub has moved. The permanent fix is a pinned or keyed hub.
Cost cited in the source: Pinned hub: approx. €900–1,000 plus labour; repair after a slip: approx. €750–2,300 (converted from dollars)A rough figure from the original database, not an up-to-date quote.