Communication Issues

[n_kremer36]

Good Morning Tuners of all ages,

I am struggling BIG TIME with this, and ive tried just about every test i can think of, or find on ye ole interwebs.

2006 Trailblazer SS - 6.0L 4L70E

TL;DR - Engine blew, rebuilt, Cam is only upgrade..

Tune's flash just fine, car starts, idles, and runs GREAT.. Now the issue.
When trying to log, connect to vehicle, hit record.. as soon as i start the vehicle, within 5 seconds the VCM Scanner logs freeze completely, and dont record anything.

Throws U0001 U0073, and randomly will throw U0101..

Ive tried back probing all comm lines, all CAN BUS, reflashing, redownloading, resyncing, cannot find anything wrong anywhere.

Ive attached a screenshot of the DTC's, Freezeframe, as well as a failed log, and the tune from PCM NC

Any Help would be greatly appreciated. Thank you!

DTC screenshot 1.pngfreezeframe 1.pngFAILED LOG 11.21.hpl11.21.24.hpt

[Bill@HPTuners]

I would suspect a ground issue based on the fact that the engine was pulled, its pretty common a ground doesn't make it back to where it was supposed to go. Additionally its a 19 year old vehicle which tends to lead to more wiring gremlins in general.

[n_kremer36]

I would suspect a ground issue based on the fact that the engine was pulled, its pretty common a ground doesn't make it back to where it was supposed to go. Additionally its a 19 year old vehicle which tends to lead to more wiring gremlins in general.

Shockingly enough, just tried my buddies MPVI2, and it all worked flawlessly. So not sure wtf happened to mine, but guess it’s a paper weight now.

[Bill@HPTuners]

if you think its a device issue open a support ticket.