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2019 Sierra 5.3Li 4wd 1500 codes

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2019Sierra New Member

2019Sierra

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Back in January, after driving my truck to town, stopping and starting a couple times, it wouldn't start.  After half a dozen tries, it started but the check engine light was on. I couldn't get a hold of the shop I go to, but after 3 days, the light went out. Everything has worked fine since.  Today, while in for an oil change, they did a scan and found codes P062B, P1682, P16A7 and P16BC.  They told me it's either the MAF Sensor or wire chafing.  I did find Service Bulletin 21-NA-032 online. I have no idea if this is the right bulletin but it looks like it might be.  It says to check UBEC connector X3, position H6.  Sounds easy enough.. but.. where and what is UBEC (I assume is the fuse block under the hood) and how do I get to X3?   If that's not the problem, where else should I look?   As it stands now, I don't trust this truck and don't want to be stranded on the side of the road or in the bush somewhere..

Thanks.

 

silveradosid Senior Enthusiast

silveradosid

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there is a ground wire on lower right hand side of the truck. it runs from the frame to the body of the truck behind the wheel liner, it is a known problem and can cause a lot of problems

2019Sierra New Member

2019Sierra

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Thanks Silverasodid.  I don't have time to get too far into it today, but I did have a look at the connection on the frame. It wasn't too bad, no rust, but I wire brushed the frame and cleaned the  lug on the strap. 

  • 9 months later...
2019Sierra New Member

2019Sierra

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I cleaned the ground wire. It wasn't that bad but I haven't had it happen since.  Not yet at least..   I would feel more confident that the problem was the ground wire if it was actually corroded.  I never did check UBEC. 

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