Sierra 3.0L Duramax Software Update Problem

cwhite158 · April 16, 2022

A lot of people on this forum have noted the extended crank/no start issue, but I just started getting something a little different. After taking my 2021 AT4 3.0L LM2 to the shop with a check engine light for NOx efficiency, the dealer completed an ECM update. Every start since I picked it up last week the truck cranks three times longer to start than it did before the update. It is not as noticeable as when the truck cranks forever and fails to start, but it is not right. I have one other confirmed case of this situation from a friend with the same truck, but was wondering if anyone else is having this problem after the newest update? To make matters worse, when the auto stop feature kicks in there is a longer delay than normal for engine re-fire which is not doubt a safety issue when in traffic. Thanks in advance for your responses.

redwngr · April 17, 2022

Most everyone who has the crank/no-start update applied reports that the vehicle cranks slightly longer after the update.

Presumably the checks that are done after cranking begins, but before the injectors are fired is the reason.

Mine seems to crank longer too.

I've not heard anyone else comment about the auto stop/start taking longer.

I don't think mine takes longer for the restart.

Auto restart does a bunch of things different, so I'd not be surprised (but can't verify) if it doesn't do all the same 'pre-start' checks that are done before the first start.

I don't recall anyone ever reporting a crank timeout / start when restarting from auto-stop.

My 3.0 was at about 17,000 miles and 16 months old before the update was applied.

It has never had a crank timeout / no-start.

I guess what I'm suggesting is the longer crank at first start is to be expected.

Messing around with mine, I find I can reduce foot pressure on the brake enough that it restarts, but does not permit the vehicle to move.

It must reach a minimum speed before autostop will activate again, so if brakes pressure reduced enough that the vehicle is allowed to creep ahead to make it start, and then brake pressure again increased to hold vehicle -- it won't re-stop.

Cody Silva · January 5

I took my 2021, 3.0 L Duramax in due to the crank no start issue. It never popped a check engine light and it’s done it twice in the last three weeks. Dealer performed an ECM update and when I went to pick the truck up today as soon as I started, it had a check engine light for P1098 coolant control valve. Has anyone experienced this code after an ECM update for the crank no start issue.

silveradosid · January 6

it is common to get codes after programming has been done , the tech should have checked and cleared codes, this is the procedure from gds2

codyb209 · January 7

14 hours ago, silveradosid said:

it is common to get codes after programming has been done , the tech should have checked and cleared codes, this is the procedure from gds2

So i left my truck for another day and they performed another updated they stated it needed after the first update which kicked the check engine light. Went to pick my truck up yesterday and sure enough the check engine was on AGAIN before i left the lot. Dealer is now saying it need the coolant flow control valve replaced....Which as we know it on back order. Im pissed that I took it in for a crank no start issue with no codes or lights and now Ive had two updates and codes and lights pop after each update. How does a truck all of a sudden need a CCV when it was being serviced for a completely different issue....

GMCustomerService · January 8

On 1/4/2024 at 10:07 PM, Cody Silva said:

I took my 2021, 3.0 L Duramax in due to the crank no start issue. It never popped a check engine light and it’s done it twice in the last three weeks. Dealer performed an ECM update and when I went to pick the truck up today as soon as I started, it had a check engine light for P1098 coolant control valve. Has anyone experienced this code after an ECM update for the crank no start issue.

This is certainly not what we like to hear, Cody Silva. Please know, customer satisfaction is extremely important to us. Our team would be more than happy to take a closer look into the concerns with your 2021 Chevrolet Silverado's Coolant Control Valve. To do so, please send an email to [email protected] with ATTN: Cody Silva/GM Trucks in the subject line.

Please include your contact information, VIN, a brief description of your concern, and the name of your preferred dealership. We look forward to hearing from you. To learn more about GM’s Privacy Policy, please visit https://www.gm.com/privacy-statement.html. The information you provide may be monitored and recorded and is subject to the GM Privacy Statement.

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Mike Bradley · February 9

IS THERE A TSB ON THE CRANK NO START ISSUE?

redwngr · February 11

On 2/9/2024 at 7:56 AM, Mike Bradley said:

IS THERE A TSB ON THE CRANK NO START ISSUE?

There was.

The software solution/update for the LM2 was released November 2021.

If the truck was built after then or if it has been updated since then it will have the revised software.

Edited February 11 by redwngr

BigBadSierra · February 13

On my 2022 Refresh what you are calling a longer crank is my normal start every time on my truck. Crank Crank Crank start. Probably three full revolutions of the engine. I think the fix was to take more reading from the Crank Position sensor before starting. Originally it only took one reading and if it missed that the engine would not start.