Have you checked the trans control relay and wiring? The low battery voltage code could be the result of the control relay open or high resistance or control relay to PCM high resistance or open. Since the light comes on right away, my guess is there is either a wiring issue between the PCM and control relay or the relay itself.
At this point, nothing is pointing me in the direction of the pressure solenoid. Can I ask why you feel that is a suspect?
Saturday, August 16th, 2014 AT 6:24 PM