Hey guys,
forgive me in advance for the vague description, I'm posting this up for a fella who emailed me an inquiry...

His truck (LLY I believe) will not accept any programmers besides a Superchips, he's tried PPE, Quadzilla, and one other I think and they all say there's an error reading the ECM, the Superchips brand works just fine.

He does have an aftermarket radio, and he's unplugged the radio and tried as well as the fuses associated with the radio and tried it that way he said.

Sounds like the Superchips brand programmer has locked the ECM, even when he removes the programmer and puts it on another truck, his ECM will still not cooperate with any other brands... hasn't tried EFI Live yet so you can see where I'm going with this..... any thoughts? Thanks!