2014 GMC Sierra 5.3 error msg

riderover · Post by **riderover** » Mon Feb 11, 2019 3:45 pm

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 by **mikel** » Wed Feb 13, 2019 4:58 pm

seems its skipping the tcm, try going back to stock then retune.

riderover · Post by **riderover** » Wed Feb 13, 2019 5:35 pm

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 by **mikel** » Thu Feb 14, 2019 9:10 am

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

2014 GMC Sierra 5.3 error msg

2014 GMC Sierra 5.3 error msg

Re: 2014 GMC Sierra 5.3 error msg

Re: 2014 GMC Sierra 5.3 error msg

Re: 2014 GMC Sierra 5.3 error msg