Chosen Solution

The O/D light on my 2004 Ranger with a 5R55E transmission is blinking after about 20 minutes of driving. The code is P0735, “gear 5 incorrect ratio.” It shifts fine before the light blinks. Even after it blinks, it drives fine in gear 5, but once the light blinks, shifting is abnormal. Might changing the TR Sensor help?

Bob DeCamp, this is going to be tough on. This could be as simple as

  • Low transmission fluid level
  • Dirty transmission fluid
  • Shift solenoids after that you could be running into major issues. It could be a valve body problem as well as the front (OD) servo or a bad OD band (unlikely since your trouble start after some driving). I’d start with simple (inexpensive) to complicated (expensive) as well as a good manual

Can low transmission fluid cause the od off light to come on