I had that happen to my 2021 GMC Sierra SLT with 5.3. It happened 3 times so far, each time it flashed for a few seconds and the blinking light shut off when i got on the gas.
The first time around 1,000 miles 3 weeks ago (engine was warm) and the last two times it happened this Friday ( engine warmed up) and Tuesday morning (cold engine) around 1,400 miles. It runs and drives normal, the dealer said they cant do anything since the light is off and it makes no weird noises and cleared the code history.
They had a couple of trucks come in 2 weeks ago due to misfires and rough idle and all of them filled up with gas at costco, i also only put 87 at costco for mine, ill try different gas this time.
I always shut off the start stop every time i drive it, i wonder if it is a glitch in the computer. i'm debating installing the PULSAR and see if it continues to happen after i try new gas first.
Jerry O
