2022 L5P Parasitic Draw TSB

[paint94979]

Whats up guys,

I took my truck to the dealership a few months ago as the factory 3/36,000 mile warranty was expiring... I noticed shortly after the truck started having a slow start issue, followed to today the truck wouldn't start this morning. I jumped it, drove it about 70 miles. I went to start the truck up about 90 minutes later and the truck just clicked. The truck is now out of warranty, is there a TSB for a parasitic draw? The truck has 44k miles, I'd hate to spend $600 on new batteries if there was something else going on.

 

[Pure Diesel]

I don't know about the 2022s, but I know the 2024' were having the over air updates and the systems/modules are staying on I believe and not shutting off and draining batteries down. I believe software updates changed it so to only do it when driving. Did you have a software update done recently?

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[paint94979]

I don't know about the 2022s, but I know the 2024' were having the over air updates and the systems/modules are staying on I believe and not shutting off and draining batteries down. I believe software updates changed it so to only do it when driving. Did you have a software update done recently?

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I'm sure that the dealership did an update the last time it was in... I'll find out tomorrow by calling the little prick at the dealership.

 

[Chevy1925]

Just bad batteries. 3 years is common out here. My dads 24 made a year and they died. Those really do have junk batteries.

 

[Pure Diesel]

Just bad batteries. 3 years is common out here. My dads 24 made a year and they died. Those really do have junk batteries.

I had one battery go out in 6 months. They replaced the battery and then 3 months later same thing happened again. No start. They ended up replacing both batteries and the truck's been fine since.

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[jlawles2]

With these new computer controlled alternators, if the battery voltage is below a certain level it will not charge. Truck will run all day, but it will not put out enough to charge the batteries.

I'd second batteries as the first place to start, also watch the battery voltage gauge. My 24 after 1 year magically stopped putting out over 13.5 volts (GM will not let service change parts to fix it) and would regularly run at 12.5 volts (yeah scares the crap out of me). Had engineer look at it and he made comment batteries were at 85% (well no crap since the alternator is not putting out enough to fully charge them), but said nothing wrong since the light is not on. That's a whole other rant on stupidity in modern vehicles and how the charging system works though.

 

[malibu795]

With these new computer controlled alternators, if the battery voltage is below a certain level it will not charge. Truck will run all day, but it will not put out enough to charge the batteries.

I'd second batteries as the first place to start, also watch the battery voltage gauge. My 24 after 1 year magically stopped putting out over 13.5 volts (GM will not let service change parts to fix it) and would regularly run at 12.5 volts (yeah scares the crap out of me). Had engineer look at it and he made comment batteries were at 85% (well no crap since the alternator is not putting out enough to fully charge them), but said nothing wrong since the light is not on. That's a whole other rant on stupidity in modern vehicles and how the charging system works though.

I rented a 1500 Silverado bout 10 years ago ECM would kill the alternator at X voltage..

Gues it's a mileage/EPA thing to get what little extra they can.

 

[TheBac]

With these new computer controlled alternators, if the battery voltage is below a certain level it will not charge. Truck will run all day, but it will not put out enough to charge the batteries.

I'd second batteries as the first place to start, also watch the battery voltage gauge. My 24 after 1 year magically stopped putting out over 13.5 volts (GM will not let service change parts to fix it) and would regularly run at 12.5 volts (yeah scares the crap out of me). Had engineer look at it and he made comment batteries were at 85% (well no crap since the alternator is not putting out enough to fully charge them), but said nothing wrong since the light is not on. That's a whole other rant on stupidity in modern vehicles and how the charging system works though.

I rented a 1500 Silverado bout 10 years ago ECM would kill the alternator at X voltage..

Gues it's a mileage/EPA thing to get what little extra they can.

That is exactly whats happening. Battery(ies) could have developed a bad cell so wouldnt take a charge or the battery(ies) just gave up the ghost. Its far more commonplace with all the electronics in vehicles now.
Its not just the trucks, either. Its all GM cars from about 2014-ish on (ive no experience with other makes). My Regals did it, all our Cruzes did it, the Colorado does it. I replaced the alt on the '14 Regal bc I thought it wasnt charging (c'mon -- the car had 230,000 on it)...but the new one did the same thing. Its unsettling to scroll thru the DIC and see "12.5 volts", thats for sure.



BTW, Hi Paint! Miss ya around here! Congrats on the baby!

 

[Ron Nielson]

It would be nice to have access to a graphing voltmeter that you could leave connected overnight or over an extended period when the electrical system is asleep. Works like a charm if you can't find the problem otherwise

 

[Mikey52]

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