NHTSA Complaint #11441547 — 2012 HYUNDAI ELANTRA

Initially it stalled while idling in my driveway on 2 different occasions. Several days later on a short errand 8/2/21, it stalled at a red light, the engine puttered, and it failed to shift gears at 20-25 mph and 40-50 mph unless I alternated between letting off and then reapplying the accelerator. Just continuing to press the accelerator made it slow down. No warning lights came on, but I took it to a local repair shop. They couldn't replicate the problem on several attempts, so I picked it up and drove it home slowly. I was afraid to use it - trying to accelerate on an entrance ramp and having it slow down would be dangerous. After it sat 2 months, my husband went to drive it a little. It stalled at a stop sign and had trouble shifting gears again. When I went to drive it to the repair shop, the Check Engine light came on immediately. I drove it carefully, and it was OK. The shop called the next day. They replaced the crankshaft position sensor because of a code, and it was ready. On the way home, it shook violently and flashed the Check Engine light the 2 times it tried to go to second gear. I had it towed to the repair shop. They couldn't replicate the problem, so they replaced the crankshaft position sensor again. As soon as I started home, it acted up again. I went back and had a mechanic ride with me. It acted up. He said he hadn't pressed the accelerator as hard as I did, he'd never seen anything like it, and to take it to a Hyundai dealer. I had it towed to a Hyundai dealer. They replaced a switch inhibitor, valve solenoid, harness, and gasket valve body cover - all in the transmission. As soon as I started home, it acted up again. I turned around and took it back. That was 11/18/21. I called on 11/23/21 and told my service writer about the NHTSA investigation opened 11/12/21 for speed control problems and said I thought my car might be having this throttle problem. He said he hadn't heard about it, and he's going to call me back tomorrow.