Not shifting into overdrive

Tiny
BIGHUGH
  • 1995 DODGE RAM
  • 5.9L
  • V8
  • 2WD
  • AUTOMATIC
  • 236,000 MILES

Tranny is 46rh automatic.I replaced od/ lock up solenoid inside the tranny, put fresh atf 4 tranny fluid in it along with new filter. Still not shifting into overdrive.I've been driving the truck over 2 years with out overdrive.I don't drive the truck over 55mph. Because of the no overdrive shift problem.I did the obdi fault code thing by turning the ignition on and off 5 times within 5 seconds. And code 12 37 32 55 came up. Looked at the trouble code chart online.37 means. Ptu solenoid. Or tranny temp sensor. So I called the local dodge dealer. The parts guy said not showing anything for a ptu or tranny temp sensor. And he even asked the tranny mechanic and I still can't get an answer why the tranny won't shift into overdrive. By the way code 32 is egr problem which I will be replacing egr.12 is code for 50 starts.55 is code for end of trouble code. Anyway.I still drive the truck everyday without od. Now its driving me nuts cause I don't know why its not shifting into od. Its a work truck and I'll drive her into the ground.I'm not sinking any big bucks on tranny rebuild or replacement. Hope it is just a simple fix. Please give me an answer! Going bonkers! Can't get an answer from anyone. Please help! Thanks

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Monday, June 2nd, 2014 AT 8:49 PM

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Tiny
2CARPROS KEN
  • ADMIN
  • 10,221 POSTS

I have seen where if the thermostat is stuck open or is missing the computer has a difficult time going into closed loop which is when it will allow the transmission to go into overdrive so check that first. It will cause the EGR not to open as well There are two shaft speed sensors I would go toward next. Here are some wiring diagrams so you can see all electrical components related to the transmission.

Here is a guide that will help you do some testing to get the problem figured out.

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

Please let us know what happens so it will help others.

Cheers, Ken

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Wednesday, August 23rd, 2017 AT 8:26 PM

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