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Won't start ?

B.R.67

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

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Conecraft New Member

Conecraft

Posted
Posted

Took truck in to the Chevy dealer .. Code P12A6 came through on the scan. This is a fuel pump driver fault code. The dealer found Bulletin #20-NA-218 which addressed the spin but no fire problem and instructed to reprogram the ECN. As I read the bulletin & code P12A6.. I believe this bulletin address' the problem. We shall see, but I have confidence that the issue is resolved. 

  • 6 months later...
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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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JonoLainez New Member

JonoLainez

Posted
Posted

I have a 2015 Silverado with the code P12A6. I have had the ECM changed the fuel module changed and the fuel pump changed even have had a ground rewired. All just to land on the truck leaving me stranded which is weird because in the morning it works just fine on the way home from work is when it turns off on me. I cannot find any resolutions to this problem has anyone figured this out? This is the weirdest code I have ever seen and when it leaves me stranded i can wait a little bit and then it cranks back up just enough for me to be able to pull it over to the side so i can leave it for a couple hours and come back to get it to take it home.

  • 5 months later...
Briggs Hollow New Member

Briggs Hollow

Posted
Posted
On 12/23/2019 at 1:51 PM, Icefisher said:

I am embarrassed to report my issue was operator error.

When I was washing my truck, I cleaned the Weather-Tech Floor mats.  When I reinstalled them, I accidentally covered the accelerator pedal.  By doing this, the vehicle will turn over but will not fire.

 

I didn't feel too bad, because it took the tech 5hrs to find the issue as well.  My dealer was really cool, and did not charge me a dime for the issue.

Thanks so much for your post! I tried a new fuel control module, which didn't fix it, and was just getting ready to have it towed when I read your post. Just cleaned my truck right before this happened and unknowingly covered the gas pedal. Debating on letting my wife know or not. Thanks again!!!

  • 1 year later...
Steve in MO New Member

Steve in MO

Posted
Posted

I just had the same issue described above, washed my floormats, replaced them, (accidentally put my floor mat over the gas pedal and didn’t know it) and then tried to start the truck.  Turned over but wouldn’t start.  Thanks for posting this, saved me a lot of headaches and time.  Put the floor mat in correctly, and it started right up.  2019 GMC Sierra 1500.  Your post is appreciated!

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    • Atlas
      Tire psi

      By Atlas · Posted

      It's possible the two trucks are using different body control modules which is why yours works and the OP's doesn't.   So much in these newer vehicles depends on model/trim configurations, production date. They don't all use the same modules like back in the day.
    • Chuck FB
      Tire psi

      By Chuck FB · Posted

      I forgot to answer the question as per what market mine is set to and yes I finally found that area on mine and yes its also set to America.   So here's something I realized as I wasn't looking at that part in the Sierra section until now, your right that what I see here as choice 3 under Sierra which says 07/2023-06/2026 ( 433 MHz 13542523 ) it has no choice 5 for tire pressure selection. Where as it does under the Chev choice. However I kept going down the list within the Sierra and I am really wondering if choice 9 will work for your truck as it has the same model number and hertz sensor as my truck. I would say try that choice first, if that doesn't work then jump over to the Chev section and again choose that same model and hertz choice as for some reason the Chev section gives the choice 5 of tire type/pressure selection for going back a number of years. Could very well be an Autel thing that they just didn't get the updates all done properly under Sierra but anyway first try that selection 9 I suggested under Sierra and then go from there. 
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    • Chuck FB
      Tire psi

      By Chuck FB · Posted

      Ok I missed that part that yours is a GM. The strange part is that the choice for year ranges and within the year of 2026 is different on the Sierra then on the Chev for some reason as I am looking at my tool at the Sierra choices. Now I am guessing you see as to your sensor part number as it may be different on your truck for some reason and a call to GM should get you the part model number of the sensors you should have as well as which MHz your sensors are. I know mine are the ones as per what I listed but there are other choices in the Autel and got me wondering if by some chance they put different ones in your truck. Having said that, did you try using each of the choices starting from No 1 and going on down the list, not sure if that would mean shutting off the engine each time and resetting the tool and going at it again each time. Also I thought of something else which may sound retarded but if there was some stupid chance that the chev choice would work. The reason I say that is that the Sierra is showing a range up to 06/2026 for the various choices of sensors it could be where as the Chev has one choice that has that 12/2026. By the way it is possible to not run the truck and you may know that as per not pressing the brake but pressing and holding the start button for a few seconds and it lights up the dash ( its called service mode ) but that sucks battery power and if it were me doing it that way I would be throwing on a decent sized battery charger before doing it that way as killing your battery won't make you happy at me at all !.    Like I say, just a thought to try the Chev choices if you have already exhausted the Sierra choices but first it would be nice to know for sure what exact sensor model and hertz your truck uses as I assume only those choices that mention the sensor would work unless a choice that does not mention the sensor model would somehow work. Its frustrating when one is trying to use tools like this without the experience of the tool and the vehicle, as I am sure dealer techs themselves struggle with it when starting out or a new model year comes along that is slightly different. 
    • jgaudet99
      Tire psi

      By jgaudet99 · Posted

      I tried before I updated the scan tool just incase an update messed it up, but it never worked so I updated the scan tool and it still didn't work.   Only difference is I click on Sierra not Chevrolet cause I have a Sierra.   If I click on 2026-2024 I didn't have any option to change placard, when I click on 2023 it does give me the option but when I try to do it,.it says vehicle not supported!   I have my region or market or whatever it is set to America I think, is that what yours is set to?

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