Transmission not shifting properly

1999 MITSUBISHI TRUCK
200,000 MILES • 1.4L • 4 CYL • 2WD • AUTOMATIC
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MATEO LIBONATI
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  • 1 POST
the box truck runs fine but the transmission will not auto shift on it own; once I stop I must manually place auto lever in lowest gear then manually shift it up to next higher gear to make transmission achieve higher gears.
is there a module of some type that's gone bad or is transmission on its way out?

thanks
Mar 13, 2021 at 11:01 AM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,193 POSTS
  • ASE Certified Mechanic
It could be an internal issue. However, if you can shift it manually, the clutches sound fine. The first thing I would check is the transmission fluid. Check to make sure it is full and its condition.

Also, I am not showing this vehicle as a "truck". What model is it? Was the transmission fluid ever changed?

Let me know.

Take care and God Bless,
Joe
Mar 15, 2021 at 6:20 PM
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