Flashing Check Engine Light

[bdm62987]

I was driving my 2016 Silverado 5.3L to work this morning going 72mph on the highway and the check engine light decided to start flashing for about 8 seconds and then shut off. The truck never lost power and nothing happened. I drove all the way to work and have been driving in the past with zero problems. Is this something I should be concerned with?

[Justin101714]

Flashing light is when the ECM determines that there is a rise in emissions that could damage the catalyst, a misfire could cause this. Probably had a AFM lifter that got stuck open for a bit. If it happens again I'd worry about it then.

 

 

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[muddkatt]

Carry it to your dealer and have them check the codes, then repair as needed.

[TxTruckMan]

I'd worry about it. Bring it to your dealer and have them read the codes.

[ewiski]

the flashing check engine light isnt a "keep on driving and dont worry about it" it means stop now.

[dasimmon]

Flashing light is when the ECM determines that there is a rise in emissions that could damage the catalyst, a misfire could cause this. Probably had a AFM lifter that got stuck open for a bit. If it happens again I'd worry about it then.

 

 

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+1

[Justin101714]

Go ahead and take it to the dealer then....if it isn't currently doing it, they're sending you out the door with a "no problem found" diagnosis.

 

 

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Edited May 17, 2017 by Justin101714

[16LT4]

Codes are saved from in ECM memory and can be retrieved. If nothing else, take it simply for CYA so if your engine eats itself later on there is a record of complaints.

[LSR Mike]

When that happens I hit the OnStar Button...

[Thomcat]

They should be able to retrieve the code provided you have an OnStar subscription.......they read the active code once when my evap.canister vent crapped out on a Tahoe.....they can access the vehicle for a remote start or monthly readout of problems so they should be able to do it for a stored code.

[TxTruckMan]

Codes are saved from in ECM memory and can be retrieved. If nothing else, take it simply for CYA so if your engine eats itself later on there is a record of complaints.

Exactly. A tech can read the stored code. Maybe it's an intermittent problem that they can address. Maybe there's a TSB on the problem and they can perform a SW update. Either way, I'd just take it in for a quick look. They'll probably find nothing, but this is one of those "better safe than sorry" situations.

[bdm62987]

Thanks everyone, this is what I thought.

[DaveJohn]

Had flashing engine light, truck running rough, traction control light also on.  Definitely misfiring.  Took to dealer, code P0300, number 4 cylinder misfiring. ignition coil wire off, wire and coil corroded replaced same, all good