I have a 2002 5.3 and a 2002 4.3 4l60 bolted to it, the transmission is stick in first gear and won't shift out of it I hooked the scanner to it and there's no codes and drove it while shifting it manually with the scanner and it works fine I sent the pcm back to current performance so they could reflash the computer and still didn't work, there thinking it could be a bad computer any ideas?

 

There is no trouble codes coming up on the scanner

 

Is the VSS hooked up and working; in other words does your speedometer work?
What vehicle speed was the scanner showing?
Not sure that you could even shift with a scanner if you have the "M6" segment, but are you sure the PCM has the OS/Segment for the A4 automatic?

 

The speedometer works right both on the dash and scanner are the same I'm not sure what you mean about the segments this electronic stuff is fairly new to me I have the snap on solus pro scanner it shifted through all the gears

 

Have the speedometer work and scanner show the same speed is good.
There are basically two variations of the PCM - one for manual transmissions and one for automatic transmissions. The difference is software and a tuner can change from one to the other. The difference is often called a "Segment" which is part of the OS (Operating System).
In short, the PCM is acting like it has the manual transmission segment.
Where did the PCM come from?

 

The pcm came with the 5.3 current performance made a wiring harness for it and programmed the pcm for my combination I sent it back to them so they could reprogram it and it's still doing the same thing

 

Are you saying that it will shift with the scanner hooked or that it will shift if you shift it manually with the shifter? Does your scanner show that the PCM is commanding the solenoids to perform the 1-2 shift?

 

Since your speedometer is working and your scanner can read the MPH from the PCM, and the scanner can shift gears, I think there is something wrong with the PCM.

 

It will only shift when you make it shift with the scanner. The scanner would only show the gear to be in first didn't seem like the pcm was calling for second

 

I unplugged the transmission connector and drove it a few miles to a friends house to do the exhaust today in limp mode on the way back home tonight the air bag, security, and abs light came on then turned the high beams on and the radio cut off do those things run through the pcm? The vehicle is a 99 s10

 

In 1st gear both solenoids are no. In 2nd gear A solenoid is turned off and B solenoid stays on. Does the scanner show that the PCM is commanding the A solenoid to turn off when it get to the speed where you feel like it should shift?

I'm not sure about the S10 PCM. The F bodies use a body control Module for some of those things.

 

Sounds like a car out of Poltergeist II. Or Christine. http://www.imdb.com/title/tt0085333/

Limp mode is 3rd gear; I assume you noticed that then.
The Christine-like symptoms indicate a bundle of electrical problems; none of those systems go through the PCM.

 

Did you unplug the speed sensor too? That would cause most of those symptoms.

 

lol it's strange because the problem with the transmission has been going on for a while and none of them lights came on until tonight I guess I'll have to call the guys that built the wiring harness (current performance) tomorrow there harness is supposed to be plug and play but that doesn't seem like it now

 

I left it plugged in the speedometer is dead on with gps

 

The only way the solenoids would change is using the test mode on the scanner to listen to them clicking in transmission they all were working I don't think they would change while driving on there own only do it using the scanner to shift it

 

Call Mike Carnahan (404) 606-8434 he is a tuner at Vengeance Racing. He sold me a used PCM flashed for my car.

 

Current performance is sending me a used pcm flashed for my setup to try if it fixes it there only gonna charge 100 dollars for it thought that was pretty cool of them hopefully it fixes the problem

 

Thanks for everyone's replys love this site