Two problems related to transmission not engage have been reported for the 2011 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2011 Hyundai Sonata based on all problems reported for the 2011 Sonata.
When starting and moving into a drive gear from park, or while at a stop in drive, the vehicle will suddenly lose its drive letter display and will feel like the transmission is not engaged. This is still occurring after the dealership inspected the vehicle for this issue. This issue has occurred repeatedly. After the vehicle is turned off then on, the drive letter display reappears with the drive letter that I moved the transmission shifter to. When the transmission is moved to reverse, the drive letter disappears again. Sometimes this happens 3 or 4 times immediately in a row. It has also happened while in drive at a stop and has required that I turn off the engine then turn it on again to see the drive letters.
The contact owns a 2011 Hyundai Sonata. While driving 35 mph, the transmission did not engage and the vehicle hesitated upon accelerating. The engine warning light illuminated. The dealer diagnosed that the harness failed. The vehicle was repaired, but the failure persisted. The dealer diagnosed that the switch inhibitor failed and needed to be repaired. The vehicle was repaired. The manufacturer was not notified of the failure. The failure mileage was 79,667.