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Won't start ?

B.R.67

By B.R.67
in Troubleshooting, Warranty & Recalls

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mg2020at4 Enthusiast

mg2020at4

Posted
Posted (edited)

2020 AT4 carbon pro w/ 6.2L.  Threw a code and took it into the dealership.  Replaced the fuel control module.  Couple days later I walk out and the thing won't start.  Cranked but wouldn't turn over.  Check engine code said an issue w/ with the steering column sensor.  They ordered the part and I have been waiting for it to come in.  Oh yeah....1400 miles.  No faith in this truck, can't wait to see what goes wrong next. 

Edited by mg2020at4
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tystaples
tystaples

I have the same issue, started yesterday on my 2020 Denali 1500 with the 6.2. I purchased the truck new the end of April and it currently has 4900 miles on it. Crank and crank with no start. I did eve

tbarn
tbarn

A video of it not starting is of no use to the dealer or GM. It's not that they don't believe you but they cannot duplicate the concern. Watching it not start isn't any help diagnosing the issue.

econometrics
econometrics

True, but if you have a video with indisputable proof that the error is occurring, it will at least leverage them to take you more seriously and give more time to do tests needed to try and replicate

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Dnt Senior Enthusiast

Dnt

Posted
Posted
On 1/12/2020 at 4:53 PM, Cb2 said:

Thanks for heads up, had same issue with my factory floor liners.  Couldn't get to start, just cranked with no fuel.

Guys this does not make any sense, how could the floor liner being on the gas pedal cause the engine to turn over but not start? I intentionally pulled the factory floor liner out and tossed it back in on top of the gas pedal and mine starts, there has to be more to this? Is it just a coincidence and people are being told that is what it is maybe? The scenario of the floor liner just does not make sense!

mg2020at4 Enthusiast

mg2020at4

Posted
Posted
On 3/10/2020 at 2:46 PM, mg2020at4 said:

2020 AT4 carbon pro w/ 6.2L.  Threw a code and took it into the dealership.  Replaced the fuel control module.  Couple days later I walk out and the thing won't start.  Cranked but wouldn't turn over.  Check engine code said an issue w/ with the steering column sensor.  They ordered the part and I have been waiting for it to come in.  Oh yeah....1400 miles.  No faith in this truck, can't wait to see what goes wrong next. 

Got it back from the dealer with a replaced sensor.  Couple days later....won't start.  1600 miles!

 

This is phenomenal.  I should have never got rid of my toyota. 

Pinnacle Enthusiast

Pinnacle

Posted
Posted
On 3/10/2020 at 1:46 PM, mg2020at4 said:

2020 AT4 carbon pro w/ 6.2L.  Threw a code and took it into the dealership.  Replaced the fuel control module.  Couple days later I walk out and the thing won't start.  Cranked but wouldn't turn over.  Check engine code said an issue w/ with the steering column sensor.  They ordered the part and I have been waiting for it to come in.  Oh yeah....1400 miles.  No faith in this truck, can't wait to see what goes wrong next. 

Those carbon pros are beautiful, but ya this gen is the faultiest I have seen yet. 

mg2020at4 Enthusiast

mg2020at4

Posted
Posted
19 hours ago, Pinnacle said:

Those carbon pros are beautiful, but ya this gen is the faultiest I have seen yet. 

Thanks.  I love the thing when it works.  Truck is still in the shop.  They acknowledge an issue but can't figure out whats causing it.  

mg2020at4 Enthusiast

mg2020at4

Posted
Posted (edited)

UPDATE:

19 days in the shop in the first two months of ownership and I still don't have my truck back.  This is phenomenal. 

Edited by mg2020at4
mg2020at4 Enthusiast

mg2020at4

Posted
Posted (edited)

For those of you getting this problem - the codes in the ecm are the Fuel Control Module and the Steering Column sensor.  Both have been replaced multiple times on mine.  I went to pick it up from the repair this AM and on the first start it did the same thing and threw a code again.  GM has no idea what is causing the problem and are just throwing sensors in.  So my car is back in the shop and now the fuel control module code came on.  Thats four repair attempts on a truck with 1600 miles and purchased in the end of January.  I smell lemons.

Edited by mg2020at4
Convoytrucker New Member

Convoytrucker

Posted
Posted

Same exact problem for me. 2020 Trailboss, 1800 miles. Got in after work and wouldn’t start (couldn’t hear the fuel pump). Came back the next morning and it started right up. Now left wondering where it’ll strand me next.

mg2020at4 Enthusiast

mg2020at4

Posted
Posted
On 4/3/2020 at 8:51 AM, Convoytrucker said:

Same exact problem for me. 2020 Trailboss, 1800 miles. Got in after work and wouldn’t start (couldn’t hear the fuel pump). Came back the next morning and it started right up. Now left wondering where it’ll strand me next.

They are replacing the wiring from the steering column sensor to the ecm or whatever now.  This was the "fix" from GM HQ.  We will see what happens when its done..

Convoytrucker New Member

Convoytrucker

Posted
Posted
1 hour ago, mg2020at4 said:

They are replacing the wiring from the steering column sensor to the ecm or whatever now.  This was the "fix" from GM HQ.  We will see what happens when its done..

Interesting.. I’ll update with what the dealer tells me when it goes in this week. Hopefully they come to the same conclusion. 

Colossus Senior Enthusiast

Colossus

Posted
Posted

well, get it in so they can fix it so you can be happy again.

 

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jacbwils Enthusiast

jacbwils

Posted
Posted

I have a 2020 Sierra with the LM2 diesel. At 150 miles it stalled while driving and multiple crank-no starts. Sounds similar to other posts. Dealer replaced the crankshaft position sensor and has new fuse box ordered. Will see what happens next. 

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