Gear Selector Spring
ModerateInterior & TrimInside the automatic gear selector mechanism, a tiny torsion spring fatigues and snaps. While the transmission physically engages Park and the mechanical pawl locks, the internal microswitch fails to register the lever position, triggering an urgent "Secure vehicle against rolling" warning.
"Secure vehicle against rolling" warning on iDrive screen when in Park, Audible chime upon switching off ignition, Error code 420106 stored in transmission control unit
- Engage Park, switch off the ignition, and check whether the rollaway alert triggers
- Verify if the selector lever has been replaced or if a replacement torsion spring kit has been fitted
- Confirm the electronic parking brake engages normally without warning lights