1990 Dodge Ram No Overdrive

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ZANNKIND
  • MEMBER
  • 1 POST
At about 148,000 miles the transmission stopped going into overdrive. I bought this from my dad so i know it wasn't beat or anything. I have done the following things to try and fix the problem. Changed trans fluid, new solenoid in transmission, My dad also tore apart dash to make sure the overdrive override switch wasn't blown and that checked out. It has been suggested to me that it probably needs a new Power Control Module (PCM). I'm thinking this is where I go next but at the $168.00 price tag after the $120 core charged returned I wont to get options whether this could be the deal. Another thing that may be helpful is that I drive this truck still about everyday it shifts smoothly and runs great interstate driving without the OD is a no go though.... Any help/advice on this would be greatly appreciated.....thx Jon.
Jan 20, 2006 at 3:10 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,694 POSTS
Hello,

Yep you have done all of the steps before replacing the control module. I would tap into the the trigger wire for the OD solenoid and drive it to make sure it is or is not getting signal.

Here is a guide to help.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Please let us know what happens.

Cheers, Ken
May 1, 2021 at 11:30 AM

Suggested Repair

Before replacing the PCM, tap into the overdrive solenoid trigger wire and road-test with a test light to confirm whether the solenoid is receiving a signal.

Conversation Summary

A 1990 Dodge Ram with about 148,000 miles stopped engaging overdrive. The owner had already changed the transmission fluid, replaced the transmission solenoid, and verified the overdrive override switch. An expert said those steps were appropriate before replacing the powertrain control module and recommended checking the OD solenoid trigger wire for a signal while driving.

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