2016 Duramax acting up

[maxwell]

something really strange happening with the wifes duramax. Both batteries test good, and it starts with the key in any temperature no issues. However, once it got cold if i remote start the truck with the factory fob, it kills both batteries, shuts off and will not start again without a boost....only happens with the remote start. Its like its not engaging the alternators i dont even know how thats possible? No engine codes. if we always use the key there is no problems

 

[jhurkot]

something really strange happening with the wifes duramax. Both batteries test good, and it starts with the key in any temperature no issues. However, once it got cold if i remote start the truck with the factory fob, it kills both batteries, shuts off and will not start again without a boost....only happens with the remote start. Its like its not engaging the alternators i dont even know how thats possible? No engine codes. if we always use the key there is no problems

Factory remote start or aftermarket?

 

[Ricki Bobby]

Original batteries? I just went through this, replaced batteries and no problems. If the batteries are weak, it won’t start with the remote start, only with the key.

 

[tmo1620]

Factory remote start or aftermarket?

Factory fob usually means factory command start


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[tmo1620]

Original batteries? I just went through this, replaced batteries and no problems. If the batteries are weak, it won’t start with the remote start, only with the key.

Our car just did the same thing, when cold it won’t start with command start, once warm it will. Replaced the battery this morning and back to normal, these new electronic packed vehicles sure get finicky when voltage drops off a touch, even when batteries test out in the ok range


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[Teth-Air]

I had a GMC Duramax. Sometimes I would start it and drive and notice the volt meter really low. I had to re-start for it to kick the alternator in. I can't remember if it was when using remote start but for sure it was glitchy software. I never felt I could trust it even though it only happened a few times.

 

[jhurkot]

Factory fob usually means factory command start


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Oops missed that.

 

[maxwell]

Factory remote start or aftermarket?

factory

 

[maxwell]

Original batteries? I just went through this, replaced batteries and no problems. If the batteries are weak, it won’t start with the remote start, only with the key.

yes original batteries, but they test good and the weird thing is it starts no problem with the remote start. the FIRST time, it dies before its completes its 20 min warmup cycle because the batteries are dead because the engine is obviously using all of that power. Can only revive it with a boost. will not start the second time with the remote OR the key

 

[maxwell]

Our car just did the same thing, when cold it won’t start with command start, once warm it will. Replaced the battery this morning and back to normal, these new electronic packed vehicles sure get finicky when voltage drops off a touch, even when batteries test out in the ok range


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yea, something computerish is going on forsure. Might just have to bite the bullet and try replacing the batteries its the only weak link as they would be 6+ years old now

 

[TylerG]

I find on my Ram Sean that the remote start seems to fire up all the accessory systems, faster than using they key, like others have said if the batteries are at all weak, maybe its drawing it down too far, and it "tries" to start once and kills them?

 

[maxwell]

I had a GMC Duramax. Sometimes I would start it and drive and notice the volt meter really low. I had to re-start for it to kick the alternator in. I can't remember if it was when using remote start but for sure it was glitchy software. I never felt I could trust it even though it only happened a few times.

volt meter is good when i fire it up with the key and drive it, but i cant see the voltage when i remote start it to see if its dropping. it doesnt fire up the guages with the remote start. Ill throw a volt meter on

 

[2kDoo]

If they're original batteries I would bet they are the culprit. Sucks ass spending 500 on new batteries but that might be the trick
The oem ones in my 2012 cummins lasted 4 years before I replaced them with crappy starting issues like you describe

 

[Trashy]

yes original batteries, but they test good and the weird thing is it starts no problem with the remote start. the FIRST time, it dies before its completes its 20 min warmup cycle because the batteries are dead because the engine is obviously using all of that power. Can only revive it with a boost. will not start the second time with the remote OR the key

Weird.... almost sounds like an alternator thing, where it's not charging up the batteries, until it's boosted. And like other have said, it could just be the batteries? I know it's a long shot, but doo you have 2 other batteries you can try in it?

 

[Mountainman52]

I would just BUY a new truck how about a Ford this time........... early Christmas present ?

 

[Teth-Air]

I would just BUY a new truck how about a Ford this time........... early Christmas present ?

Only if you want it for next Christmas. Delivery is about a year out.

 

[maxwell]

Weird.... almost sounds like an alternator thing, where it's not charging up the batteries, until it's boosted. And like other have said, it could just be the batteries? I know it's a long shot, but doo you have 2 other batteries you can try in it?

thats exactly what it is doing. Not sending charge to the batteries from the alternators, but rather just drawing off the batteries until they die

 

[maxwell]

I would just BUY a new truck how about a Ford this time........... early Christmas present ?

when she finds out that she has to go outside to warm up her truck that will be an easy sell.

 

[Teth-Air]

volt meter is good when i fire it up with the key and drive it, but i cant see the voltage when i remote start it to see if its dropping. it doesnt fire up the guages with the remote start. Ill throw a volt meter on

I remember driving with the volt meter super low. And this was an almost new truck at the time. If it was not from remote starting it does not mean that it might not do that at times where you start with the key. It was a software glitch or bad relay contact as it happen only 3 times in the first 3 years of ownership.

 

[maxwell]

Only if you want it for next Christmas. Delivery is about a year out.

maybe, im still waiting on a 2022 i ordered may 2021. GM wrote it off on the 2021 books so im sure they are in no rush to get it to me now