Check engine light!?

Ranger522vx · March 29, 2020

2019 5.3 8 speed trail boss. Any idea what might have caused a check engine light. With all the recalls and now this I’m really starting to get pissed off. Traded a 2015 sierra to avoid problems and now I wished I would have kept it.

pnmvroom · March 31, 2020

If you have On star, you can hit your On star button and ask them if they can run a diagnostics.

tbarn · March 31, 2020

Don"t kid yourself. Onstar can only see codes and maybe take a shot in the dark what it could be. They can't diagnose anything.

Ranger522vx · March 31, 2020

When I got into the truck the next day the check engine light was gone. Hasn’t shown up again. Not sure what the deal was.

SaltySLT · March 31, 2020

Same here. It was showing a U0146, U0101, & U0100 Permanent Codes and a P25A2 (Brake System Control Module Requested MIL Illumination) confirmed code.

Check Engine Light 3.28.2020.pdf

Colossus · April 1, 2020

I know not related but the most common reason for check engine lights on modern vehicles now is the gas cap not being on tight enough. Not sure if these have gas caps or are like the HDs that don't have gas caps anymore and just a stupid silly flapper? If you do have a gas cap, the rule of thump is tightening it 3 clicks if it does click.

TLDLTD · April 1, 2020

Probably easier to ask what doesn’t cause a CEL on these things. I have made peace with the fact it’s just always going to be on.

Dealer tells me all brands have issues...I guess I’m the idiot for thinking a new truck should be reliable.

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