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Re: 2002 Pontiac GTP 40th anniversary cant read or com with pcm
Posted: Tue Mar 18, 2025 2:37 pm
by antus
No communications with the PCM at all. Check your power and data wiring and make sure the ignition is on.
Get to the point where you can do a "get properties" and get basic information about OSID etc back from the PCM before attempting anything more.
Re: 2002 Pontiac GTP 40th anniversary cant read or com with pcm
Posted: Thu Mar 20, 2025 3:48 pm
by Kdog
antus wrote: ↑Tue Mar 18, 2025 2:37 pm
No communications with the PCM at all. Check your power and data wiring and make sure the ignition is on.
Get to the point where you can do a "get properties" and get basic information about OSID etc back from the PCM before attempting anything more.
i wouldnt be asking as a mopar tech if i hadn't exhausted all of possibility's of connection issues as well as com issues like OnStar radio ect i think im going to try and bench flash it after a trip to the jy to get the plugs i need to do so and if it works its something i probably dont have the time to tear apart n see, as i know the steering Colum has ben out and they may have done something there, and it says unknown pcm and doesnt error out saying couldnt communicate with pcm right? wires are there that are supposed to be and more for it do do its thing. maybe the jet dst box is broken someway or another.
Re: 2002 Pontiac GTP 40th anniversary cant read or com with pcm
Posted: Thu Mar 20, 2025 5:14 pm
by antus
If you look at the debug log, you only see TX (transmit) and not a single RX (receive) from the car. You can see its failing everything it tries due to no response as it goes through all options and recovery options, the "cant recognise" is assumimg something is connected (true) but it cant talk to it (also true in your case). Its probably a bad connection between pcm and obd port on ground or vpw, bench is a good idea to work around that.
Re: 2002 Pontiac GTP 40th anniversary cant read or com with pcm
Posted: Wed Mar 26, 2025 12:47 pm
by Kdog
well looks like my homemade benchtop VCM programmer is tits. she working well farthest ive ever got, selling jet dst.....if anyone.......anyway got a OBDLinkSX and obdwiz was confused by the wizardry and pcm hammer FTW!!!!! thanks antus your right about the rx. here is another bump i hit, 2000pcm that performance shift works on, out of car bench mode.
Re: 2002 Pontiac GTP 40th anniversary cant read or com with pcm
Posted: Wed Mar 26, 2025 12:48 pm
by Kdog
Kdog wrote: ↑Thu Mar 20, 2025 3:48 pm
antus wrote: ↑Tue Mar 18, 2025 2:37 pm
No communications with the PCM at all. Check your power and data wiring and make sure the ignition is on.
Get to the point where you can do a "get properties" and get basic information about OSID etc back from the PCM before attempting anything more.
i wouldnt be asking as a mopar tech if i hadn't exhausted all of possibility's of connection issues as well as com issues like OnStar radio ect i think im going to try and bench flash it after a trip to the jy to get the plugs i need to do so and if it works its something i probably dont have the time to tear apart n see, as i know the steering Colum has ben out and they may have done something there, and it says unknown pcm and doesnt error out saying couldnt communicate with pcm right? wires are there that are supposed to be and more for it do do its thing. maybe the jet dst box is broken someway or another.
job security, honestly if you can follow a cookbook ya can tech.
Re: 2002 Pontiac GTP 40th anniversary cant read or com with pcm
Posted: Wed Mar 26, 2025 12:50 pm
by Kdog
pcm repair also seems to be working 100% as im able to get farther, but im sure those cracked solder joints still connected, the car ran good, had hiccups once a start tho. weird shit i thought was the tune. guess not folks, use cpu bracket when using k&n and dont let it bounce around!
Re: 2002 Pontiac GTP 40th anniversary cant read or com with pcm
Posted: Thu Mar 27, 2025 2:22 am
by Kdog
here some interesting stuff, dont have the og pcm unless is is but some one wrote 00 gtp, ima check that out fast
Re: 2002 Pontiac GTP 40th anniversary cant read or com with pcm
Posted: Fri Mar 28, 2025 4:09 pm
by Kdog
well, saved my first bin file. Performed with my homemade bench programmer. thanks Antus.
Re: 2002 Pontiac GTP 40th anniversary cant read or com with pcm
Posted: Sat Mar 29, 2025 12:57 am
by antus
well done
Re: 2002 Pontiac GTP 40th anniversary cant read or com with pcm
Posted: Mon Mar 31, 2025 7:17 am
by Kdog
shit.any help????