14 GMC Sierra 6.2L problems again

PearlSierra · December 28, 2019

Happy holidays everyone. I have a 2014 GMC Sierra SLT 4wd All Terrain with the 6.2L 93,900 miles on it. I recently started having problems with the alternator voltage regulator on factory alternator. I replaced it with a Remanufactured alternator from Autozone also changed battery to a brand new one. The first Alternator they gave me started showing signs of being bad after almost a month of having it. I got another reman one and put it on myself & put on new superfine belt last Saturday. Everything was great until the last couple days the truck is randomly dead or wont crank. Just a few mins ago I went out side to start the truck no lights no power when I turned the key. I wanted 20 mins try to use remote start lights flashed starter clicked but not start. The truck randomly had power again after making no lights or sound at all before so I put the key in truck it started right away but radio stations and all where reset. So any advice as to what it could be??? I'm call off work Monday to take it to the dealership hate to but I need to know what's going with this thing. Anyone think I should just put a Acdelco alternator back on it and see will it fix the issues. Really need some guidance guys if anyone can help.

durandetto · December 28, 2019

Start by making sure all your battery and alternator connections are tight and corrosion free. Then take it to a shop to have your starting and charging system checked. Don't take it to auto zone take it to a real shop with better test equipment. Could be a faulty battery. Auto zone batteries are notoriously junk and these trucks are really sensitive to proper voltage.

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PearlSierra · December 28, 2019

Okay I will try that route...I'm gone see if the dealership can squeeze me in Monday morning early. Let them do a diagnostic on it

doozer78 · December 28, 2019

Check the starter I bet that's the issue they have been failing

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durandetto · December 30, 2019

If it is an intermittent starter issue it won't show up on a test. Get underneath and check for burnt connections. Have someone start it while you watch the starter for any arcing.

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TXGREEK · December 30, 2019

Same thing happened to many, replace both your negative and positive cables. GM has had major issues with them. My Escalade and GMC pickup had same type issues, changed cables and NEVER had anymore issues.

Good luck and Happy New Year! [emoji323][emoji324][emoji312]

Sent from Above

PearlSierra · December 31, 2019

13 hours ago, TXGREEK said:

Same thing happened to many, replace both your negative and positive cables. GM has had major issues with them. My Escalade and GMC pickup had same type issues, changed cables and NEVER had anymore issues.

Good luck and Happy New Year!

Sent from Above

Dealership backed up until end of next week I'm gone let them check it out. See if they can replace both cables if that's the problem. I use to love this truck but last few months have been a pure head ache for me.

TXGREEK · December 31, 2019

Dealership backed up until end of next week I'm gone let them check it out. See if they can replace both cables if that's the problem. I use to love this truck but last few months have been a pure head ache for me.

Read some of the issues you’ve had, almost 100k miles, I’d be thankful that’s all that’s wrong with it. I’ve got an 18 6.2 that knock on wood has been the best truck I’ve ever had. I’ve bought new high end trucks every two years and this one is by far a keeper. You should read some of the horror stories going on in new Rams and Fords, much worse problems and they’re switching to GM. I’m sure it’ll all be worked out.

Good Luck and Wishing you and all of your loved ones a fantastic New Years, may the new year bring you great health and prosperity!

Sent from Above

PearlSierra · December 31, 2019

1 minute ago, TXGREEK said:

Read some of the issues you’ve had, almost 100k miles, I’d be thankful that’s all that’s wrong with it. I’ve got an 18 6.2 that knock on wood has been the best truck I’ve ever had. I’ve bought new high end trucks every two years and this one is by far a keeper. You should read some of the horror stories going on in new Rams and Fords, much worse problems and they’re switching to GM. I’m sure it’ll all be worked out.

Good Luck and Wishing you and all of your loved ones a fantastic New Years, may the new year bring you great health and prosperity!

Sent from Above

Happy New Years to your Family as well bro....I hope things work out. I also just got the 2020 map update in the mail for my truck tonight its vin specific from Gm plug it in truck says Invalid update. If things keep going like this Toyota Tundra is my nex move in the upcoming year I'm getting tired of fighting this thing.

TXGREEK · December 31, 2019

Happy New Years to your Family as well bro....I hope things work out. I also just got the 2020 map update in the mail for my truck tonight its vin specific from Gm plug it in truck says Invalid update. If things keep going like this Toyota Tundra is my nex move in the upcoming year I'm getting tired of fighting this thing.

Thanks, vehicles are like a marriage, always needing something of either a nip and tuck or some sort of upgrade lol. It’ll work itself out. I’ve also heard the new Tundra is going to be sweet, something to look forward to if you’re still not happy.

Sent from Above

Gagliano7 · December 31, 2019

Sounds like a bad ground.

durandetto · January 1, 2020

Dealership backed up until end of next week I'm gone let them check it out. See if they can replace both cables if that's the problem. I use to love this truck but last few months have been a pure head ache for me.

I'm in the same boat. My truck was great for a few months after I bought it. Then I had a collapsed lifter that took out a valve and the cam. Thankfully under warranty. Shortly after getting it back from the dealer. I had an injector seal fail. Replaced bank 2 injectors myself then a week later one of the new injectors failed again. Replaced all four again under warranty. So far its been good. My truck only has 72k on it. My 04 had 170k with zero engine troubles.

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PearlSierra · January 2, 2020

On 12/31/2019 at 10:48 AM, Gagliano7 said:

Sounds like a bad ground.

Exactly that's what I'm thinking its between a bad ground or the negative & positive cables. When the weather clears again I may try to clean one of the grounds. Will have to YouTube it. Lol I wonder how much for the dealer to replace the cables or the ground I'm trying not to go just yet last resor.