No VIN programmed

Ricardo Diagnostician Plymouth, Michigan Posted   Latest   Edited  
Question
Programming
2019 GMC Yukon Denali 6.2L (J L86 Gas) 10-spd (10L80)

Hello to all. I'm working on a 2019 Yukon Denali that was in a crash , the pcm got dented and truck would not run so customer bought a new one from ebay (supposedly they're in back order at the dealer) and installed it then called me to program it , of course is global platform but when I got there I noticed there's no CEL inform customer that there must be an electrical fault on the electrical system and if the ecm gets locked I'm not paying for it but he says it's because is not programmed (which I know is not true) so he insists to try and program it, as expected it doesn't work ,it programmed the calibration but no VIN , I got paid and he gets pissed and says it must be defective so orders another, calls me second time and informs me that I'm wrong and he checked every fuse in the truck and wiring around the crash area and he even talked to his buddy at the gm dealer and he told him that I don't know what I'm doing and the no CEL is because there's no software in the ecm so again insists to program it guess what ; I got paid 2nd time and customer is really pissed so I asked him : you want me to diagnose it? Told him there's a charge for diagnostic and he gives the ok. It's late so I'll be back tomorrow morning; next day I got there and again he informs me that last night he checked fuses again and all are good but still no CEL so it must be another defective pcm. I then hooked up my scanner and there's code for no power on signal at the chassis control module following schematic found that the signal (12v) comes out of the fuel prime fuse which shares power to ECM checked fuse and ...... that's when customer starts swearing left and right . Now we have CEL , I tried to reprogram ecm to see if it will write the VIN because calibration is already there but that's a no go so I tried to program security and that's a success so truck starts and runs fine but no VIN , we're waiting for a 3rd pcm

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Caleb Diagnostician
Mishawaka, Indiana
Caleb Default
 

You must have new ECM from the dealer. The ones he is getting online I can guaruntee you are not new. They will never let you write the VIN man. I really doubt these ECMs are on backorder. I worked at GM up till a week ago and havent had a problem. Walk away man. Just your diag in this post tells me you are way too intelligent to be wasting your time on this nonsense. If this customer wants too…

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Agree
Ricardo Diagnostician
Plymouth, Michigan
Ricardo Default
 

I was skeptical about his back order claim too, its global platform so same ecm is being used in pretty much any gm SUV and truck since 2014 I think . I guess he was just trying to be cheap but after all the money he paid me I hope the next pcm is from the dealer.

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Bruce Owner/Technician
San Antonio, Texas
Bruce Default
 

Caleb, Some people sell new modules on Ebay. I know as I was one of them but because of stupid people who can't read a listing and Ebay taking the side of absolute morons who cannot and will not follow instructions, I do not sell anything on Ebay anymore. But until a week ago I did sell new AC Delco modules on Ebay. This case is not one of mine.

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Albin Diagnostician
Leavenworth, Washington
Albin Default
 

Your so called "customer" seems to know more than you do. At this point, I would let him prove to himself that he wasn't so knowledgeable as he thinks he is. I really doubt you will ever get this fixed with the "used" computers you are using.

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Ricardo Diagnostician
Plymouth, Michigan
Ricardo Default
 

I get what you're saying since they're global ecm it can't work because it will have a VIN already programmed. What I don't understand is if they were used how is that now that the electrical issue is fixed still there's no VIN? I would guess if they were used it would show the incorrect VIN , sps wouldn't allow me to do the immobilizer learn and truck wouldn't run because the ECM -immobilizer…

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Michael Owner/Technician
Irving, Texas
Michael Default
 

So SPS is not reading the VIN and you have to enter it manually? Was programming a no go, because the calibration said it already matched? If that was the case, change an option and replace/reprogram then go back with the correct calibration.

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Ricardo Diagnostician
Plymouth, Michigan
Ricardo Default
 

Tried that too and no go , calibration is already programmed so it just messages that is not allowed to reprogram with same cal , that's when I decided to try immo learn to see if it will write vin on ecm , truck started but still no vin

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Ricardo Diagnostician
Plymouth, Michigan
Ricardo Default
 

There's only 1 calibration since it's 2019 and no options to change

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Bill Owner/Technician
Jackson, Michigan
Bill Default
 

Ricardo your gonna need a New / Not previously programmed PCM. You can not reprogram this computer using SPS....

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Michael Mobile Technician
Clinton, Utah
Michael Default
   

Ricardo, It is true that there are some of these GM PCMs on back order. If you reach out to Bill at Automotive Perfection in Jackson, Mi. He has a tool that can fix the problem. The tool will allow the use of a second hand part. -Mike

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Ricardo Diagnostician
Plymouth, Michigan
Ricardo Default
 

Thanks Michael, he just replied and said that's a no no,

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Bill Owner/Technician
Jackson, Michigan
Bill Default
 

Ricardo Please give me a call …

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Dwight Owner/Technician
Oceanside, California
Dwight Default
 

Side note, you have a good looking shop and a nice web page. Excellent job!

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Albert Owner/Technician
Towanda, Pennsylvania
Albert Default
 

Maybe you should have told him that you'd diagnose it first before you go down that rabbit hole. Personally I always tell the customer before I fix anything I'm going to diagnose it first that what I know what I'm dealing with.

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Eric Owner/Technician
Edgerton, Wisconsin
Eric Default
 

But this vehicle owner sounds like he knows it all and is willing to pay someone over and over, so, why argue? Just take the money. I know what you mean, many years ago I let customers tell me what to do too. It got old after a while and I decided to stand up for myself. Things were much better after that. Besides, I can handle admitting I'm wrong when I'm wrong, which, although it happens…

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Ricardo Diagnostician
Plymouth, Michigan
Ricardo Default
   

Thanks Albert. First thing I told him was " there's something wrong with the electrical system" and he pretty much said I was wrong and just try to program the ecm. He knows I do electrical diagnostic but he just wanted to save money and do the diagnostic himself. So I don't feel like I did anything wrong nor that I'm in a rabbit hole.

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Albert Owner/Technician
Towanda, Pennsylvania
Albert Default
 

It is a rabbit hole if he keeps calling you for the same problem. instead of letting you diagnose it right the first time. For me I always tell the customer that I'm going to diagnose it then go from there. If they insist i that I just replace the part with out diagnosing it then I'll decline the job. I will not do any repairs until I've diagnosed the problem.

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Ricardo Diagnostician
Plymouth, Michigan
Ricardo Resolution
 

New pcm fix the issue. Thanks for everybody's replies

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