A PMT feels like a bang or shudder when it stops. It's important to know if it is doing a PMT or just simply stopping. If it just stops I would take a look at the harness that goes from the floorboard and brake switches to the card. It should just connect to another connector behind the contractor access panel. Sometimes codes will throw you off. In my 13 short years as a tech I have learned to simply look at what the truck is doing or not doing. Know what circuit and components come in to play and start from there. I have learned the hard way of just concentrating on error codes. You can sometimes get led astray if your main issue s causing a secondary event code. But in this SRC truck you must know if it's doing a PMT or not to know which direction to go. Hope this helps.