ECM not communicating with Trans Controller
Thread Starter
Staging Lane
Joined: Jan 2008
Posts: 60
Likes: 0
ECM not communicating with Trans Controller I have a question that I hope somebody can answer. I have a LS2 with a 4L65E behind it. The issue I am having is I cannot get a reading from the trans controller through the OBD port. I had Speartech make me a pedal harness to run the drive by wire pedal. The harness that he made basiclly connected the ecm to the trans through the pedal. When the car is not running with the key on it shows the throttle to be fully open, however when you start the car it drops to 33%. Other than that it runs fine it just does not have the power it should. Is there something I need to look at. Also I forgot to mention I am running the factory GM harness with the exception of the piece that Speartech made. I already called Speartech and he is unavailable until next wednesday. Any help would be appreciated. By the way it is in a older Chevelle.
