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Bigpapa

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  1. I have a 2014 GMC 1500 with a 5.3L. I recently replaced my CATs because I was getting the dreaded P0430 code. SO I put new Magnaflow exhaust systems as well as brand new sensors in it. I got it all in and about a day after I got it all installed I got the same code P04030. I double checked the seals and sensors and looked at the live data and it all looks on the level...the only other thing I can think is that there is a wiring issue with it...the connector on bank 2 sensor 2 looks in order so I'm a little confused as to why I'm still getting this code other than there is a ground or an electrical issue I haven't looked at.
  2. Reaching out to see if anyone else has experienced this. I have a 2014 GMC Sierra 1500 All Terrain with the 5.3. I’m having problems with starting this thing from time to time. It will run fine for a few days and fire right up every time I get in it. However some days on a cold start or after driving awhile and stopping, when I get in to start it up I got all dash lights are working, except I notice my MPG history is erased (which tells me we’re in trouble) then I get messages on the dash that reads, service trailer brake system, service stabilitrac, power steering reduced. Then the check engine light will appear. When I try to crank everything goes black and I’m not hearing clicks from the engine. After I let it set for about 5 minutes it will fire right up no hesitation. I run the codes on it and there’s is a laundry list of codes, which the GMC dealership is saying they’re all low voltage codes...so we swap the battery truck, it runs fine for about a week and a half and then starts doing the same thing. Alternator is ok because I can see it recharging the amps on the truck....any ideas as to why might cause all this? I’m desparate!!!
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