Another GM Fail

David Diagnostician New York Posted   Latest  
Resolved
Programming
2019 Cadillac XT4 Premium Luxury 2.0L (4 LSY) 9-spd (9T50)
P1467

Got called to do a computer update for a garage. This is a shop that I have done work for in the past and these guys are pretty sharp. Their customer wanted this done as he had seen a TSB somewhere. At about 75 % of the writing process it failed. I shut it all down, checked all my connections, and restarted the process. It failed again. I got an e4423 and e4492 programming code. I am unsure of what the e4492 code means. It did say Cyber Security Access Failure. However, now the ECU is a no comm and of course a no start. I have comm with all the other modules. I have had programming failures before, but never one that rendered the ECU to a no comm. If anyone has any thoughts on this I would love to hear them. My call to GM went nowhere. Any help is truly appreciated.

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Richard Mechanic
Illinois
Richard
 

testing-public​.​carmd​.​com/Tsb/Download/1…

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Interesting
Phillip Educator
Ontario
Phillip
 

Wow thats a pretty good TSB. Wonder why the help desk didn't know that when he was on the phone.

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David Diagnostician
New York
David
 

Phillip, I never got to the help desk. I am still waiting for them to call back.

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Maynard Technician
Ontario
Maynard
 

How concrete is the ‘no communication’ ? There is cases where the modules appear to be a no communication and yet will accept a programming event. New module installations. Just passing that on in the event you may be able to try again even tho it looks to be a no comm.

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David Diagnostician
New York
David
 

Maynard, I have tried 2 different scan tools and I also tried the programming event. No comm with anything.

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Josh Manager
Florida
Josh
 

Are you using a MDI2?

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David Diagnostician
New York
David
 

Josh, Autel Ultra and IM608

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Josh Manager
Florida
Josh
 

Sorry, I don’t have access to my computer at the moment (and on terrible WiFi so I can’t look). I know Cadillac had a couple Global B models in 2019 and I know it’s been a struggle to program those platforms with anything other than an MDI2. Again, not saying that’s what it is, just don’t have access to login and look but wanted to throw out there to possibly help.

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Randall Owner/Technician
Michigan
Randall
 

Their may be some additional help here: diag​.​net/msg/m1vpuww9r0… gmrepairinsights​.​com/programming-er… productforum​.​autorepairdata​.​com/forum/showthre… static​.​nhtsa​.​gov/odi/tsbs/2016…​.​pdf gearsmagazine​.​com/magazine/oh-no…

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David Diagnostician
New York
David
 

Randall, Thank you for all the links. I have read most of these and still have my problem. I see a lot of information for e4491, but I have found nothing for e4492.

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Randall Owner/Technician
Michigan
Randall
 

You may have seen it, but this was the only reference I found for a E… savana, information 2 months old): "Good day all this van came in as a no crank no start. We diagnosed it to have a bad theft deterrent module not on the low speed bus. Replaced the module and lock cylinder with new key. Programed module and key but ecm doesn't receive the ok from the bcm during programing we get an…

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Jamie Mobile Technician
British Columbia
Jamie
   

I'd suggest that you purchase an MDI2. Well worth the investment. Also, GM will not provide support to someone who is using a non-validated interface. Autel Ultra and IM608 are not supported officially by GM.

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Kevin Technician
Manitoba
Kevin
 

Good to have them all! Tech 2 MDI MDI2

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Robert Technician
Michigan
Robert
 

Any chance the module already has the correct calibration . I saw that code yesterday just a lost communication code .

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Jeffrey Manager
Arizona
Jeffrey
 

David, Not much out there on the e4492 other than this (iATN is still good for something) I'd be looking real close for something aftermarket connected to the bus. members​.​iatn​.​net/techmail/view…

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David Diagnostician
New York
David
 

Jeff, Thanks for the reply. I just got off of the phone with GM and after an hour or so, they said that they have no idea of what could have gone wrong and no idea of what to try next. They were very pleasant though. They told me that I need to reprogram the unit again and I told them it would not communicate. They said to replace it. I have looked all over the car for anything aftermarket…

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William Owner/Technician
Kentucky
William
 

I would definitely try a different vci, we had a 2002 trailblazer the customer put the wrong pcm in and the gas gauge worked backwards. After three hours and isolating the bus the bosch vci worked after the mdi 2 and cardaq failed.

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William Owner/Technician
Texas
William
 

Sounds simple but it's bailed me out of many a failed write, hard reset, unplug module/wait/replug.

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David Diagnostician
New York
David
 

William, Thank you for your reply. Reset was one of the first things I tried. Nice to know that someone else feels the same way I do.

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David Diagnostician
New York
David Resolution
 

Replaced the computer, programming went fine on this new unit. The down side of this whole thing was that the same p1467 code came back. Thank you to all who helped. The resolution to this problem was the new ECM.

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