My 96 Deville does not downshift into first gear. When i take off from a stop it starts in second. The tranny shifts fine through the gears. The service transmission light is on. Anyone have an idea what causes this? I have put over 10,000 miles on the car and it still runs fine other then starting in second, but I'm sure there is more stress on the tranny., thanx

Sure, get it scanned for the trans code and post back, no other way here.