Sent my PCM off for repair due to the NO BUS issue. Truck cut off on me 3 times on the way home then wouldnt start again. Got home and showed NO BUS. Received PCM after repair and truck starts up and runs fine. Took it for a test drive and the trans will not shift out of first. When i let out it seems to go into neutral and free rev until 3k rpms. Then it starts to pull again. Once i stop and start it pulls normal but still will not shift. Company that repaired PCM says they have nothing to do with that. Shifted fine before PCM was sent off. Any suggestions? Should i have to flash the PCM?