smartcarofamerica.com/threads/transmission-wont-shift-gears.37593/

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Forum thread: Transmission won't shift gears. | Smart Car of America Forum

smartcarofamerica.com/threads/transmission-wont-shift-gears.37593/ · p. 1 · Applies to: 450, 451, unknown

Source: smartcarofamerica.com Topic: transmission shift failure / clutch actuator programming Models discussed: 450, 451, unknown Solution status: yes

Problem: Smart Fortwo transmission won't shift into gear reliably, particularly reverse, with relentless beeping. Issue occurs periodically starting around 40k miles.

Solution: Software reflash/reprogramming of the clutch actuator and electronic control module is the primary solution. A STAR computer system 'teach-in' process can recalibrate the clutch actuator. For older/high-mileage vehicles, check battery condition first (weak battery affects shifter motors and clutch actuator performance). Physical clutch replacement may be necessary if actuator fails or release bearing fork is damaged.

Key facts: - Software/firmware update for clutch actuator available from dealer (should be free under warranty) - Clutch actuator reprogramming/recalibration resolves intermittent shifting issues in many cases - Weak battery can cause shifter and clutch actuator motor malfunction; battery older than 5 years should be replaced first - Physical clutch replacement may be needed if actuator motor fails or release bearing fork develops hole from rod contact (high-mileage vehicles) - STAR diagnostic computer system required for clutch actuator teach-in/recalibration procedure - Issue confirmed as known problem with at least one dealer service bulletin available