Jump to content

3.0 Duramax cranks but won’t start

Dbersuch
 Share

Recommended Posts

gemarsh Senior Enthusiast

gemarsh

Posted
Posted
27 minutes ago, gemarsh said:

Never have had this problem and have 14,200 miles on it. 2021 GMC Denali. 

I did re-torque the fuse box bolts the first month of ownership. Less than 300 miles.

  • Replies 510
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

ColoradoCub
ColoradoCub

There’s nothing you did that will avert it happening again, and as of now GM has no clue how to make this problem go away. They are 0 for 3 on bulletins to fix it, and tightening fuse block bolts, hol

Another JR
Another JR

Moderators    Could you please move this thread?  This engine is not used in the HD trucks. Thanks

MyFordsNeverBreak
MyFordsNeverBreak

The confirmed fix is to trade the vehicle in..

Posted Images

Barrett10 Enthusiast

Barrett10

Posted
Posted
On 7/20/2021 at 6:07 PM, Barrett10 said:

Truck is currently at 3900 miles.

Truck is in the shop, they had a GM engineer come and look at it today.  He wants to have the cam shaft cover removed for inspection... I told them that the exciter wheel has not proven to fix the issue.  The service advisor said they are not going there yet, but need to remove the cover to inspect.  4-5 hour job.  Monday will be day 24 in the shop, not consecutive but cumulative.  Will update when I get more info.

  • Thanks 1
GJR1212 Enthusiast

GJR1212

Posted
Posted
On 7/22/2021 at 2:31 PM, gemarsh said:

I did re-torque the fuse box bolts the first month of ownership. Less than 300 miles.

I had one long crank episode.  It happened on the same trip to town that set the CEL for a circuit fault, short or open, to the radiator dampner motor.  I don't know think they are directly related, but I did decide to torque my fuse box per the service bullitin I had seen on this forum.    The screws were loose.  It took several turns to get to 40 in-lbs.   I stepwise took the four screw to the 53 in lb spec.   Since then, no CEL codes or long starts.  An anadotal observation is that my charging volts indicate above 14 Volts and I recall the gauge always reading less than 14 before tightening the fuse box.   GM should tell dealers to chech and torque these bolts as part of any routine service.

ColoradoCub Enthusiast

ColoradoCub

Posted
Posted
On 7/13/2021 at 8:47 AM, Gruggas said:

Sorry for not updating fellas. So, after losing my mind on GM, we came some sort of agreement. I’m not 100% happy and that they fixed the problem, but I ended up keeping the truck because it’s everything I wanted and they gave me a BUNCH of stuff to keep the truck. A new sister to that truck would have taken forever dude to parts shortages. After the 3 time the issue happened, I took it to the dealer the next morning and the did a huge update to the ECU. Since then, no problems… for now. I’ll keep you guys posted if anything else happens.


Well how goes the battle, are you still getting crank no starts?

Elstro17 Enthusiast

Elstro17

Posted
Posted

I’m assuming this issue hasn’t been resolved.  I read this whole thread and nobody seems to have it resolved.  What’s the next step in this process?  I love this truck, but it can’t be unreliable.  

Hello32 Enthusiast

Hello32

Posted
Posted
4 minutes ago, Elstro17 said:

I’m assuming this issue hasn’t been resolved.  I read this whole thread and nobody seems to have it resolved.  What’s the next step in this process?  I love this truck, but it can’t be unreliable.  

For whats its worth, I opened a case with GM regarding a dispute at a dealership regarding this issue. They offered me some points to use on accessories. The executive resolution team did let me know GM engineers are aware of the problem. He did confirm their is no fix as of yet and reccommended I don’t have the dealership rip apart the truck but instead wait for a more current update.

  • Thanks 1
Booger T Enthusiast

Booger T

Posted
Posted
On 7/20/2021 at 11:37 AM, MNJoel said:

Anyone with this issue on higher mileage diesels (greater than 5k)?

 

Mine had three instances all under 1100miles. Currently at 5500 miles and no instances since 1100

2020 Silverado, 25k and nary a problem🙃

jmac576 New Member

jmac576

Posted
Posted

Add one more to the list of long crank/ no starts. 2021 Silverado first happened at 700 miles after sitting all night (remote start) started on second try. Second time it happened at 802 miles after running and sitting for 10 minutes. Also started on second try. I hope GM fixes this issue quick, I’m pretty disappointed after buying a $63k truck that is not reliable. I have more confidence in my lawn mower starting than this really heavy paper weight. 

  • Haha 1
Frankhpns Enthusiast

Frankhpns

Posted
Posted
4 hours ago, jmac576 said:

Add one more to the list of long crank/ no starts. 2021 Silverado first happened at 700 miles after sitting all night (remote start) started on second try. Second time it happened at 802 miles after running and sitting for 10 minutes. Also started on second try. I hope GM fixes this issue quick, I’m pretty disappointed after buying a $63k truck that is not reliable. I have more confidence in my lawn mower starting than this really heavy paper weight. 

Sorry to hear of your plight. My truck is still in shop  Hopefully it will be out this week after 37 days. Bent camshaft sensor exciter ring and they are also checking fuel pump for a potential secondary problem. 

20210719_122357.jpg

  • Sad 1
Hello32 Enthusiast

Hello32

Posted
Posted
42 minutes ago, Frankhpns said:

Sorry to hear of your plight. My truck is still in shop  Hopefully it will be out this week after 37 days. Bent camshaft sensor exciter ring and they are also checking fuel pump for a potential secondary problem. 

20210719_122357.jpg

How many times did you have the long start issue before you began this repair? Also was dealership able to duplicate start?

Joe Brooks Enthusiast

Joe Brooks

Posted
Posted

Man.  Seeing that is disheartening.  I want mine fixed as much as anyone but that’s a big decision to let them tear into the truck that far and not be 100% sure that is the issue.  I hope it fixes for you.  

  • Like 1
Frankhpns Enthusiast

Frankhpns

Posted
Posted
11 minutes ago, Joe Brooks said:

Man.  Seeing that is disheartening.  I want mine fixed as much as anyone but that’s a big decision to let them tear into the truck that far and not be 100% sure that is the issue.  I hope it fixes for you.  

I don't have a picture of the bent exciter wheel but I looked at it and one of its tabs was bent at least 1/2". When they removed the camshaft cover to borescope the sensor, I asked if I could use the vehicle while parts ordered, they informed me that is not a good idea because further engine damage could happen. They don't tear the engine apart unless they find that the sensor exciter wheel is bent. I would suggest that you have the inspection done to confirm. 

Joe Brooks Enthusiast

Joe Brooks

Posted
Posted (edited)

Does anyone have the actual service bulletin number I could give my dealer?  I saw it earlier in this thread but could make out the number. Thanks. 

Edited by Joe Brooks

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • Chuck FB
      Fluid Change Questions

      By Chuck FB · Posted

      There would be one way of determining the quality of the factory oil although probably more than a typical oil lab test, and that would be to draw out some oil from a new truck and send a sample to a lab that could do a more elaborate test of the oil. The issue with too little oil in the diff may not be the lack of lubrication of the diff bearings and gears themselves ( although a lack of oil volume for cooling ) but the wheel bearings because at some point the oil would be too low to properly get onto the spinning axle or fed along the axle tube. That was the claim by the local dealer from a couple of trucks in recent years that had the wheel bearings fail and they figured from lack of sufficient oil due to a severe underfilled diff and some of the bearing material made its way to the diff and it got damaged as well so the axle housings were just replaced on warranty. But your right that if the diff is over filled by whatever margin that it causes more churning of the oil than is desirable and that is no good either and can cause a pinion seal to leak. Also old oil I believe can tend to loose some of its properties like antifoaming and another good reason to change the diff oil every so often. 
    • Z45
      Fluid Change Questions

      By Z45 · Posted

      I would be surprised if the diff's were not filled (with the cheapest gear lube) at the axle factory before being shipped to GM.  If you ever watched them building trucks they install the axles and all suspension parts with the frame upside down and then turn it over before its time to install the engine.     Too much gear lube in a axle can be worse than not enough especially with a lower quality GL where is get whipped up with entrained air (foam)  weakening its ability to lubricate.        
    • MORSNO
      Oil Consumption

      By MORSNO · Posted

      This is the 6.6 gasser section of the forum, you should either delete or modify your previous post as it is misleading for anyone looking for factual information on their 6.6 gas engine.
    • Atlas
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Atlas · Posted

      Well....I've done my first intake gasket. Probably wrong, but...we'll see?   Ultra black on the china walls and 1/4" up onto the sides of the intake gaskets. Permatex High Tack (couldn't find Gaskachinch) on the head side of the intake gasket. I read wrong and it says you're supposed to put it on the mating surface of the head, not the gasket. Hoping it's like a PB&J sandwich where it doesn't matter what side the PB goes on so long as there's jelly. That crap is messy/sticky and I got a dab or two on the intake port openings, tried to wipe it off. Hopefully it won't be a big deal and will only aid in sealing.   Per instructions I left the intake (top side) of the gasket dry except for a light smear of RTV around the coolant ports. Wiggling the intake in there was a bear but I had help to free me of surrounding wiring/stuff but I was basically able to set it straight down lined up with the bolt holes.   I did not think to wait until the RTV skinned over but there probably was 5-10 minutes while it sat before installing the intake.   Bolts finger tight first. Then, followed the Chilton's manual pattern to snug them to 15 lb-ft.   Waited a little over an hour, and then did the final torque in sequence again to 35 lb-ft.   Yesterday I replaced the fuel pressure regulator and got my new "nut and bolt kit" (fuel lines) installed. Damn GM used security torx on the spider, which I don't have, so I got scammed at the local HW store for an off-brand security Torx bit set.   The new driver's door mirror arrived yesterday, so, there's a chance this thing could be running and road legal tomorrow? I don't want to get my hopes up.   This will be my first time stabbing a distributor, too. Although, lucky me, someone else marked the old distributor for removal previously, I did see that. (Someone's been here before!!). Engine is still at TDC so it *should* be just a matter of transferring the mark to the new dizzy and rotating it into place.
    • KARNUT
      2027 GMC Sierra: Official Discussion

      By KARNUT · Posted

      He has his dad’s newer truck he’s put away. He has several old cars he rotates between him and his family. I’ve seen a restored square body and a SS Chevy truck he’s sometimes drives. He did raffle off a new suburban recently. As much as he is watched if he drove new stuff as a rule we’d know it. It would be fine by me. I don’t care what people prefer. I got one more new one in me. I’d rather my wife get one. I can’t get her out of the Genesis. Don’t tell anyone. I want her to get an electric truck. I want to put a generator in the back. Just because. She hasn’t bit yet.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...