Thread: Yet again, I need some help :\

So I swapped the shifter from my GTP to my GT because I want the performance button for the tranny.
I put a bulb in the DIC for the "perf shift" light and fired her up... Needless to say, the button doesn't work.

The pcm is from the GTP, along with the engine and trans, so I know it's programmed.
Code pending is P0706 [Transmission Performance Range]

anyone?

Edit: I tried to read the thread posted in the how to section about wiring it from scratch but the page has an error on it and won't render for me.

What year is the PCM from?

2000

Did you plug the button for the shifter in?

I'm with Dan.

Originally Posted by dsmuts

Did you plug the button for the shifter in?

Yessir, I believe the wires were red and black.

Does the car shift like it's in perf w/o lighting it up?

Nope. Shifts the same. I don't believe perf mode is being enabled?!

Double check your connector. Other thing is find out which wire it has..then check that your pcm has that wire.

Will do. Do you know if the PCM is supposed to see 12v or ground? That way I can probe it as well.

Ground

Thanks again Bill, I followed the first connector to the second connector which was just about below the radio, sure enough the wires changed from red/black to blue/black... and the blue stopped right there. I extended to the 21 pin on the pcm and voila! I have performance mode

Now, if only I can get the perf light to work, life would be goood.

Check the socket at the perf light. I'd almost bet it needs a splice of that same ground.

FWIW I followed a similar thing on the Bonneville. They didn't have a metric/eng switch starting in 97, yet it was kinda listed on the diagrams. I hunted it down to find that GM added the wire from the ground to the dash main connector on all cars. The wire was not in the dash for the US models, Canadian had the wire from that connector to HUD. Was pretty interesting to see the ways that save production costs etc.

Once again Bill. Thank you. Sure enough the DIC had no pin or wire. Installed a pin and ran it to the ground trigger from the button. Success.

Glad it was so easy. So next time that kinda question comes up.. we've both learned how to get it going!

It's one of those things though...look at it and realizing the pcm uses ground vs power so it doesn't have to conduct much, and then that it uses a ground to turn things on/off like the light. All GM would have done is splice that light off the wire aiming to the pcm and poof.. accomplished two things with one wire.

Very true. I took pics of every step. Maybe I'll write up a "how to" for the next guy with this issue.

That would be good. I think I saw another guy ask about it