Recently when attempting to reprogram a pcm on a 2004 Chevy C1500 4.3l AT. I found that during the programing process the status bar in TIS2WEB would only reach 5-10% programed before it would go back to 0%. After 3 returns to 0% the failed programing screen would appear. Now I realized that I had erased the programing and the vehicle would no longer communicate let alone start or run. I got nervous. I attempted to program the pcm as a new unit but with the same failure. Then I realized that this vehicle had an aftermarket radio, given my previos V.W. expierence I chose to remove the radio, it was then that I found a device that is designed to identify itself as the factory radio and chime and which is directly tied to the CAN bus. I unplugged this device and the programing went without further issues. I contacted the engineering department of this product and was not well recieved. They said that they will follow up with me for further info but have not as of yet. I have chosen not to name this company as I do not know the forum policy but will gladly answer any questions. Hope this will save somebody else the 2 hours I spent sweating over it. Zach at [...]

Zach from Washington