Originally Posted by
LBZoom
When I was having trouble with a friend of mine's DSP 5 on his LB7, we physically had to pull the ecm connector back off and verify that one of the pins hadn't been shoved back out to the point of not making contact, sure enough the ground pin had not been inserted far enough in to catch and it got pushed back out just enough that it wouldn't ground. You can monitor the DSP switch in the scan tool to see if it's changing voltages/tunes, if it's not as you say I would try taking the ECM connector off and re-verify the pins are in place, or ground it the same way as the DSP 2 if it's possible although I'd say ECM may be the better option. Hope this helps!