Brand new Sierra 5.3 CEL flashing

[Andyh1]

Hi guys, first post on this platform. Purchased my first GMC truck, hell my first truck ever, and loving this rig. 

Elevation trim with the 5. 3 V8 engine. 

Currently sitting at around 1180 miles. I changed the oil at 1050 miles with mobile 1 0w20 (8qts.)

Today while highway cruising, I Noticed the engine icon started to flash for maybe 10-20 seconds  on /off and then it went away. 

 

From what I've gathered could this be a cylinder misfire this early on? 

I will pull codes tomorrow if any but again, this happened so quick and it never came back. 

I did not feel any loss of power or anything unusual. 

Oil level is good also... Should I have the dealer check it out? 

Any others with similar scenario? 

 

 

 

Edited May 28, 2020 by Andyh1
Added more content

[loud_pipes]

There is a recall on the brake control module - the software needs to be downloaded and updated at the dealer. 10 minute fix if this is the cause. I had intermittent CEL in my 2020 AT4 with no noticeable performance issues. This corrected it and that was over 3k miles ago. No issues since.


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[derek_05_07]

I had the same thing happen to you cruising down the backroads 85kph and the flashing check engine light, a few guys helped me out on here and said it’s a misfire
 

Take it to the dealer and get it documented for worst case OnTario situations. But like you never happened to me again, 2020 Lt TB 5.3