2003 DENALI WONT CONNECT TO PCM

[squatch422]

Already tried programmer on 2008 SS Impala, no problems, but it seems that on this vechicle it won't connect. this also happened on a 2004 Escalade...Any thoughts?

[06MonteSS]

Anything aftermarket installed in the truck? i.e did not come from the factory?

make sure anything aftermarket is disconnected/pull the fuse for - anything like aftermarket stereo, subs, amps, nav, alarm, remote start, seat heaters, trailer brake/light setup, etc.. anything like that, their wiring harnesses need to be disconnected/pull the fuses for it before you try to tune anything...

also make sure everything is turned off inside the truck.. lights, radio, heat/fan/blower, do not operate power windows, put your parking brake on, etc...

[squatch422]

I am totally honest when I say, this truck is 100% stock, no exhaust, no CAI, no stereo (other than factory) All the power is turned off in side. door closed. All is done with the exception of the parking brake...and nothing happens.

[mikel]

if the trinity talked to the 08 Impala SS, you need to go to options/change vehicle type and select the 04 Escalade or 03 Yukon to change the application from GM CAN to GM J1850, then it should work.

Thanks