The Powertrain Control Module (PCM) is setting trouble code P0748. Transmission starts out in 3rd gear.
Average Reported Mileage:
119801
Tests/Procedures:
1. Test the resistance of the governor pressure solenoid, normal is 3-4 ohms.

2. Check to see if the solenoid is losing the power supply to it just before the code sets. If so, swap the transmission relay and verify the wiring to it.

3. Check the signal on a scope to see if the circuit is staying grounded all the time. If so, check the wiring to the PCM and for a possible bad PCM.