The car has 37250 miles on it. 6 months ago, it started shifting roughly between 1st and 2nd gear. We took it to waldorf Cadillac/GM in waldorf, md. They acknowledged it was a known issue and would take the following steps: Flush the transmission, re-program the transmission, replace the valve, and ultimately, replace the transmission. They have done all the actions except replace the transmission and won't take further action. The car shifts so violently at times that you don't know if you're going to hit the car in front of you. We live in the Washington DC area, so traffic is usually stop-and-go. When the car gets to the top end of 1st gear (around 9 mph) it hesitates, then slams into second gear. It has also gotten "stuck" in first gear, while turning onto a street. The engine accelerated but the car wouldn't shift so I had to pull off immediately or risk being hit by oncoming traffic. It has only done this once since we started having problems.

- Waldorf, MD, USA

Car has locked in 2nd or 3rd gear two different times, both after long drives (2+ hours at highway speeds) and would not downshift into 1st to stop movement. The first time was a stop light and almost caused an accident, the second time was in my driveway and almost hit the house. Good brakes are the only thing that saved me. Both times, the vehicle shifted to 1st with a loud bang. Transmission also jerks the car forward from the stopped position when engine starts at a stop sign or light (when auto-start./stop is enabled).

- Williamson, NY, USA