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2014 GMC Sierra 5.3 error msg

Post any questions or comments about your Trinity for your GM car or gas truck here.

Moderators: mikel, 06MonteSS

Post Mon Feb 11, 2019 3:45 pm

Posts: 21
When the Trinity completed writing the PCM it returned a message: “ Unable to write one unit” ! I attempted to write 2 more times but it returned same mrssage. I drove it like that with no issues. Do I have to worry? Should I program the OEM backup to the PCM. Is there a fix?

Post Wed Feb 13, 2019 4:58 pm

Posts: 54226
Location: DiabloSport World Headquarters

seems its skipping the tcm, try going back to stock then retune.
Mike Litsch
Powerteq Customer Service Manager
Diablo Tech support by phone:
561-908-0040x4
M-F 8:00 AM to 5:00 PM EST

Post Wed Feb 13, 2019 5:35 pm

Posts: 21
I skipped TCM ! Is it possible the Trinity doesnt recognize I skipped tranny ? I already did all of the troubleshooting like updated Trinity and made sure latest file. I tried 3 x to program the truck. What I will try is Inwill choose an option for the tranny (tcm) and see what happens.

Post Thu Feb 14, 2019 9:10 am

Posts: 54226
Location: DiabloSport World Headquarters

so you are skipping the trans on purpose? If so its not crazy for it to tell yo it didnt program one of the modules at the end ;)
Mike Litsch
Powerteq Customer Service Manager
Diablo Tech support by phone:
561-908-0040x4
M-F 8:00 AM to 5:00 PM EST


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