Smart Roadster Shifter Stuck, Transmission Won't Engage

I had similar transmission issues with my 2007 Smart ForTwo Coupe. The symptoms matched exactly, check engine light, shifter movement problems, and failure to start. The root cause was a faulty shift lock solenoid combined with a deteriorating automatic transmission sensor. The shift lock system prevents moving out of park without pressing the brake pedal, but when it fails, it creates these exact symptoms. The loose shifter feeling occurs because the park brake mechanism isnt properly engaging. The repair involved replacing both the shift lock solenoid and transmission sensor unit. This was a serious repair that required partial transmission disassembly. The transmission control unit also needed reprogramming after component replacement. The symptoms should not be ignored as they can lead to complete transmission failure if left unattended. The repair took about 6 hours at the shop, requiring specialized diagnostic equipment to properly calibrate the new components with the automatic transmission system. Would strongly suggest finding a certified transmission repair specialist rather than a general mechanic, as proper diagnostic equipment is essential for this type of repair.

Thanks for your detailed explanation of the shift lock and transmission sensor issues. This matches exactly what happened to my Smart Roadster last winter. My automatic transmission problems started similarly, and I also faced the loose shifter and starting problems. Would you mind sharing how much you paid for the complete transmission repair? Also curious if any other related issues popped up afterward. Some mechanics mentioned potential problems with the transmission control unit down the line, but I havent experienced any since the initial fix.

I got the transmission repair done last month, and Im happy to report everything is working perfectly now. The automatic transmission parking position issue was completely resolved after they replaced the control unit. The total cost came to 1000€ for the repair, which included fixing the defective control unit and all associated labor. It was worth every cent since the transmission now shifts smoothly and the park brake engages properly. No additional problems have surfaced since the repair. The neutral position locks correctly, and the shift lock mechanism works as intended. The mechanic did a thorough job testing all transmission functions after the repair. The key was finding a shop with proper diagnostic equipment for transmission repair work. They were able to properly calibrate the new control unit, which was essential for ensuring all automatic transmission functions worked correctly. My advice would be to address any transmission issues promptly, as waiting could lead to more expensive repairs down the line. The symptoms you described are very similar to what I experienced, and getting it fixed properly the first time is crucial.

Thanks again for all the input. I finally got my Smart Roadster fixed last week. After reading about your experience, I found a specialized transmission repair shop that really knew what they were doing. The total repair came to 1250€, which included replacing the shift lock solenoid, transmission sensor, and some recalibration work. The automatic transmission now shifts perfectly, and the gear linkage feels solid again. The check engine light is gone, and the car starts without any issues. The shop was thorough and showed me the worn parts they replaced. They also checked the entire transmission system to prevent future problems. The repair took about 8 hours, but they provided a detailed breakdown of all the work done. It was more expensive than I initially hoped, but seeing how the transmission failure could have been much worse, I feel it was money well spent. No more problems with the neutral position or any other gear selections. The car drives like new again.