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Flashing CEL?

N900WM

By N900WM
in 2000-2014 Silverado HD & Sierra HD

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N900WM Enthusiast

N900WM

Posted
Posted

On a trip last week through the PA hills I noticed that my check engine light would start flashing when on a down hill grade and using the engine to brake.

 

It will to do it with both the tow/haul on and off. Will do it when the truck is cold or hot. It only flashes for a few seconds and then goes out. I called onStar when it was happening and the light went out before they could check it. Said there was no information.

 

The truck runs fine. No noticable drivability issue.

 

This happen to anyone else?

Shaners Senior Enthusiast

Shaners

Posted
Posted

Sunday I pulled an enclosed trailer to DC and back from about an hour North of Pittsburgh. Three times on the way home my SES light flashed 6 times and then went out.

 

I was currently running a tank a fuel that I had bought along I-70 at a Pilot station. I think my problem was in the fuel (water maybe) because the truck was pinging and the throttle body was sticking.

 

Once I burned that tank of fuel out, and filled up with Some Texaco gas in Breezewood, the truck quit pinging, the throttle body freed up, and no more flashing SES light.

CMNTMXR81 Senior Enthusiast

CMNTMXR81

Posted
Posted

Flashing is generally a serious misfire(s). But honestly, you need to get it scanned and find out the code. There are thousands stored in that little brain box. We're all just guessing at that point without knowing.

N900WM Enthusiast

N900WM

Posted
  • Author
Posted

I've run four tankfuls through since and it still pops up occasionally but interestingly enough, not when running Mobil 93.

Guess it means another run to the dealer to check it out.

CMNTMXR81 Senior Enthusiast

CMNTMXR81

Posted
Posted

Sounds to me simply like bad gas. Therefore leading to misfires.

 

Do you live in a cold climate and/or metro area where in winter they switch to RFG gas?

 

The RFG gas (the cheap dime store gas stations and Citgo's) will corrode the injector pintles therefore not allowing it to fire properly. Running some GM fuel system cleaner (the same as Chevron Techron just relabeled) does wonders and will clean up the injectors quite nicely.

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