One problem related to automatic transmission has been reported for the 2001 Infiniti G20. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Infiniti G20 based on all problems reported for the 2001 G20.
I had the brakes applied on my car, and put it in reverse in order to correctly position the car in a parking space. With my foot still on the brakes, because I was only moving the car a few feet, the tachometer took off like crazy, the engine reved up and the car starting inching backwards even though I still had my foot on the brakes. I almost was going to hit the parked car in back of me so I slammed the (automati) gear into park. Only then did the engine stop revving and the car stop. I turned the ignition off and came in to work and tried to calm down because I was very frightened. This also happened two weeks ago, while I was in drive, with my foot on the brake. The engine started revving and moving forward. At the time, I thought this was because I may have been on black ice.