KevinSr1

Found this thread after 2020 Silverado 5.3L Trail Boss 7500 miles was totally dead. Built 01/2020. Took forever to jump it. All the codes tripped. Theft, anti lock brakes, traction control, etc... Drove it home and the engine light stayed on. Started next morning and afternoon with no problem but the check engine light was still on. Parked in my driveway and popped the cover to the fuse box under the hood and found the 4 bolts mentioned in this thread were approximately 3/4 of a turn loose. Tightened them up. The very first start up, the next afternoon, no problem and the check engine light was out! Still took it to the stealer that day and they couldn't duplicate the problem. Cleared the codes, checked battery and connections. All was good. Didn't mention the fuse box bolts just in case they'd void my warranty. Stealer didn't mention they checked the fuse box bolts so they must not be aware of the problem. Thanks to all of you who post and help! Others like me truly appreciate the time you spend sharing your knowledge. Kevin.