Won't start ?

NHM25 · July 7, 2020

14 hours ago, NHM25 said:

I may have everyone beat on my timeline to frustration. Just purchased new 2020 GMC AT4 from Van GMC Buick in Scottsdale 3 DAYS AGO! The assembly date is June 20, 2020! It ran great the first two days... day 3, won't start. Total of 170 miles on the truck. Same issues that everyone has noted. Came outside, tried to open her up with the key fob and the battery was completely dead. Had to open manually. Push start did not function, no power whatsoever... basically a $65k brick in my driveway.

Connected battery to wife's Explorer and got the dash to light up but it wouldn't start. Tons of error messages. Kept trying to start it and it finally lights up... but was running very rough with knocking. This morning, started it up and it ran great. Dropped it off at dealer and they tell me there are no codes, it's running fine, the alternator and the battery look good. So I send them the videos below and a link to this thread... No word yet but will keep you all posted. So incredibly frustrating. Love the truck but now have to worry about this... what happens if it doesn't start when my family and I are in the middle of the woods camping/hunting? Ridiculous. 2020 could not get any worse.

Truck not starting when connected; charged for 20 min. https://www.youtube.com/watch?v=wEV5n6ZbkXU

Truck won't start after charge: https://www.youtube.com/watch?v=_78kJthwf58

TRUCK FINALLY STARTS: https://www.youtube.com/watch?v=8xEFiD66ZIM

Truck starts, idle is off:  https://www.youtube.com/watch?v=xGd-6nNTU58&t=8s

UPDATE: Dealer thinks they found the problem: Loose UBEC Bolts. There was a recent bulletin posted on 6/26/20 about this that may be the cause for this issue as a whole. Ask for document ID 5628169 or the following title for the GM bulletin: #PIT5756: Various Electrical Concerns (Inspect UBEC Bolts for Being Loose) - (June 26, 2020).

Condition: Some customers may comment on any number of electrical related symptoms. The following are some of the known reported ones:

no crank
no start
starter grinds or re-engages after engine starts
SES MIL
IPC guages sweep/fluctute and/or various IPC warning lights or messages
High or low system voltage
May have any of the following DTC's: B1325, B2750, B305D, B297B, C0049, P0562, P0700, U0100, U0101, U0102, U3006
some of these concerns may be noticed with powertrain movement, like when accelerating or braking.

Cause: These concerns could be caused by the X50A underhood fuse box bolts being loose. The X50A has built in indicators which pop up as the X50A bolts are tightened down, to inidcate the X50A is fully installed. In some cases, even if these green indicators are popped up, the bolts may still be loose.

Correction: Inspect the X50A Underhood Fuse Block bolts and verify they are properly torqued to 53 lb in (6Nm)

Dealer stated that my box was indeed loose (that's what she said). Has not been able to replicate issues. Really hoping this is the fix for my truck and all of yours. Will update forum either way. Best of luck.

Edited July 7, 2020 by NHM25

tystaples · July 7, 2020

On 7/3/2020 at 5:21 AM, Colossus said:

Very cool. What type of auto repair shops do you own? Also, welcome to the forums. What kind of 13 Dodge did you have?

General repair and maintenance shops but we focus mostly on the repair business. I had a 1500 Big Horn with the 5.7 and 8 speed. It was a great truck overall.

tystaples · July 7, 2020

On 7/3/2020 at 2:41 PM, Pinnacle said:

Good to see another one from the industry, Have you seen camshaft scaring on the Hemis from 2009 to 2014? TIPM was a big problem and still havent been changed out.

Not 100% sure on the year range but we do see cam/rocker issues on the Hemi engines- usually because people don't maintain their vehicles properly. Full synthetic oil changes every 5k miles will prevent most internal engine problems for the useful life of a vehicle IMO.

shellbunner · July 14, 2020

On 7/6/2020 at 5:27 PM, NHM25 said:

UPDATE: Dealer thinks they found the problem: Loose UBEC Bolts. There was a recent bulletin posted on 6/26/20 about this that may be the cause for this issue as a whole. Ask for document ID 5628169 or the following title for the GM bulletin: #PIT5756: Various Electrical Concerns (Inspect UBEC Bolts for Being Loose) - (June 26, 2020).

Condition: Some customers may comment on any number of electrical related symptoms. The following are some of the known reported ones:

no crank

no start

starter grinds or re-engages after engine starts

SES MIL

IPC guages sweep/fluctute and/or various IPC warning lights or messages

High or low system voltage

May have any of the following DTC's: B1325, B2750, B305D, B297B, C0049, P0562, P0700, U0100, U0101, U0102, U3006

some of these concerns may be noticed with powertrain movement, like when accelerating or braking.

Cause: These concerns could be caused by the X50A underhood fuse box bolts being loose. The X50A has built in indicators which pop up as the X50A bolts are tightened down, to inidcate the X50A is fully installed. In some cases, even if these green indicators are popped up, the bolts may still be loose.

Correction: Inspect the X50A Underhood Fuse Block bolts and verify they are properly torqued to 53 lb in (6Nm)

Dealer stated that my box was indeed loose (that's what she said). Has not been able to replicate issues. Really hoping this is the fix for my truck and all of yours. Will update forum either way. Best of luck.

Still running fine? My truck is Dead in my driveway and can't get an appt for 8 days at the dealer. Hoping your fix is what fixes mine as well.

NHM25 · July 14, 2020

54 minutes ago, shellbunner said:

Still running fine? My truck is Dead in my driveway and can't get an appt for 8 days at the dealer. Hoping your fix is what fixes mine as well.

Yes, no issues whatsoever. While working from home, I start it and drive it daily. Slowly building back my confidence in the 65K rig.

If you are 8 days out I would say try the fix yourself. It appears to be very easy. I've attached the bulletin here. Good luck and let us know if it works.

BUELLTIN (1).pdf

shellbunner · July 14, 2020

25 minutes ago, NHM25 said:

Yes, no issues whatsoever. While working from home, I start it and drive it daily. Slowly building back my confidence in the 65K rig.

If you are 8 days out I would say try the fix yourself. It appears to be very easy. I've attached the bulletin here. Good luck and let us know if it works.

BUELLTIN (1).pdf 1.02 MB · 3 downloads

Talked them into an appt tomorrow morning so crossing my fingers I can get it started and to the dealer. Thanks for the info. I forwarded the bulletin to them so they added it to my notes and we'll see what happens.

Cheers!

NHM25 · July 14, 2020

1 minute ago, shellbunner said:

Talked them into an appt tomorrow morning so crossing my fingers I can get it started and to the dealer. Thanks for the info. I forwarded the bulletin to them so they added it to my notes and we'll see what happens.

Cheers!

Awesome. Please keep us posted. Not sure I'll ever get the confidence back in my rig until I know this fix works for everyone who has experienced this nightmare.

Jack Hunnicutt · July 14, 2020

scheduled my appointment for this friday. appreciate you posting the bulletin. i am going to provide the dealership a copy.

shellbunner · July 14, 2020

2 minutes ago, NHM25 said:

Awesome. Please keep us posted. Not sure I'll ever get the confidence back in my rig until I know this fix works for everyone who has experienced this nightmare.

WIll do. I feel the same way. Supposed to take a road trip on Monday so we're nervous that we'll be stranded. Hoping it's either the UBEC bolts or the Brake Module that maybe got stuck on and drained it over the weekend. Dealer seemed receptive to the info and I'm making sure to bring 2 battery jump starters in the truck until I know for sure this is fixed.

jacbwils · July 14, 2020

I’ve had an intermittent no start issue for past month now and dealer hasn’t been able to find the issue. Replaced the ECM, EBCM, fuel pump driver module and performed every software update. I finally found the cause: there was a nut not fully seated on the battery distribution block on top of the battery. It’s the nut directly above the positive terminal with a small red wire attached to it.

NHM25 · July 14, 2020

6 minutes ago, jacbwils said:

I’ve had an intermittent no start issue for past month now and dealer hasn’t been able to find the issue. Replaced the ECM, EBCM, fuel pump driver module and performed every software update. I finally found the cause: there was a nut not fully seated on the battery distribution block on top of the battery. It’s the nut directly above the positive terminal with a small red wire attached to it.

Interesting. I'll have to check mine. Seems like GM 's having issues tightening nuts on all critical electrical parts!

shellbunner · July 15, 2020

Checked the UBEC bolts and they are all tight so probably not my issue. Checked the wire on the battery and tight as well. Tried jumping the truck to no avail. Charged the battery for an hour and still wouldn't start.

Called Roadside Assistance and they couldn't get it started. Guy said it was the 1st vehicle in recent memory that he couldn't start.

Called for a Tow after and he was just laughing about how many of these trucks he's towed recently. He said EVERY truck that he's towed had "computer" issues and clearly wasn't impressed with these.

Appt at the dealer is in an hour so can't wait for the phonecall about how they will "fix" it when I'm sure I'll be dealing with this issue again.

NHM25 · July 15, 2020

1 hour ago, shellbunner said:

Checked the UBEC bolts and they are all tight so probably not my issue. Checked the wire on the battery and tight as well. Tried jumping the truck to no avail. Charged the battery for an hour and still wouldn't start.

Called Roadside Assistance and they couldn't get it started. Guy said it was the 1st vehicle in recent memory that he couldn't start.

Called for a Tow after and he was just laughing about how many of these trucks he's towed recently. He said EVERY truck that he's towed had "computer" issues and clearly wasn't impressed with these.

Appt at the dealer is in an hour so can't wait for the phonecall about how they will "fix" it when I'm sure I'll be dealing with this issue again.

Man, really sorry. That's disappointing; GM really needs to get this thing straightened out. Completely unacceptable.

shellbunner · July 15, 2020

1 minute ago, NHM25 said:

Man, really sorry. That's disappointing; GM really needs to get this thing straightened out. Completely unacceptable.

Yea it's been frustrating. My wife is pretty stressed about taking the truck anywhere once it gets fixed. She's worried that we'll get stranded with the kids on a roadtrip or she'll get stuck somewhere by herself. The 3 months we've had it have been GREAT and we all love taking it everywhere, but now that our trust in it is shaken it's really hard.

Had to cancel our roadtrip for next week and the kids are going to be bummed when I break the news to them.

Couldn't get a loaner from the dealer since they're out of them supposedly and they suggested I front the money for a rental car and GM would most likely reimburse me. Wasn't willing to take that chance so now we're down to 1 car for the foreseeable future.

Have had 4 new cars in the past 7 years and EVERY one has had its fair share of issues. But none has just flatout failed to start and left us waiting for a tow. Really hope GM gets their ****** together and we can get back to enjoying our truck.

shellbunner · July 16, 2020

Dealer had the truck all day yesterday. Called me before they closed and kinda gave me an update.

They attempted to start the truck to move it to the service area. Wouldn't start. Tried jumping it and couldn't get it to start.

Eventually got it running, and moved it.

They tried to start it again to move it into the service bay and it was dead again. Eventually got it jump started.

He told me my truck is "weird". Not very reassuring to hear, but I'm obviously aware there is an issue somewhere, duh.

Checked the battery, all connections, computers and everything is 100% and showing fine. Didn't give me exact error codes when I asked him, but did mention that the truck was saying low voltage somewhere.

Told me it's running fine now and I could pick it up. I read him the BSCM bulletin since I park on an incline and mentioned that could have POSSIBLY been my cause and he said it very well could have caused the battery to die. I told him nothing was left on, but he kept asking if I maybe left a light on or something. I mentioned that the truck has a battery saver function built in and the lights will auto shutoff for that very reason. He said "oh yea you're right".

He asked if I wanted to pick it up and I told him unless he could assure me it wasn't going to fail on me and that everything is fixed that I wasn't comfortable taking it home without some further diagnosing. He offered to put it on a Parasitic machine?? to see if any of the computers are draining the battery overnight and he'll call me today.

Fun stuff.

Edited July 16, 2020 by shellbunner