At 800 miles my 2021 Yukon starting jerking like it had water in the gas. Then the check engine started flashing and throwing multiple codes: service safety restraint system, service traction control, forward collision system unavailable and service ESC. Took it to local dealer and the computer stated it had misfired and they said that it should be okay. Drove it home and everything started again a few days later. Called the dealership where I purchased it. They ended up towing it to dealership and opening a tac case where they replaced a fuel injector which did not fix the problem. Then they replaced the ECM which did not fix the problem. After 20 days in the shop they were advised by GMC to take off the intake manifold where they found a broke wire rubbing on the firewall which had caused over 180,000 misfires. After fixing this wire the check engine light and other warnings have gone away. But, the service safety restraint system warning is still constantly going off which is really aggravating. Fixing to take it back to the dealership. I hope they can fix it pretty fast. I’m really disappointed with my first GMC purchase.
