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When you are not towing during highway use.
the overdrive sencer
I have a 1989 Dodge B250...it has overdrive
Light being on means overdrive is inactive
throttle position sensor most liekly cause
I drive a 1993 Dodge D-250 equipped with the 5.9 Cummins and 46 RH automatic overdrive with 304,000 miles on it. I get 23 mpg on the highway and 18 mpg in the city/ back country.
No.
Get it fixed
Most likely cause is a failed throttle position sensor.
Normal cause is a failed TPS. (throttle position sensor)
there is a 10 amp fuse marked console in the fuse box that actually provides power to the overdrive cut of swicth and overdrive relay
It could have.