I have a 98 2500 with a cummings under the hood. The transmission keeps shuttling out of overdrive at 48mph to 60mph. The dealer looked at it and stated it was a bad ground they cleaned the battery cables. This problem came back after 2 days. My truck is now back at the dealer and they are troubleshooting it. I have changed out the governing senser and both selonoids in the trans. I have heard about a program update for the torq. converter to keep it locked in. Any suggestions?

 

Cummins! No "G."

Anyway, yes there is a flash update, at least for the 24Vs that they should install if the T/C is going in and out of lock-up. The other possibilit for a 24V is the bell-crank (throttle position sensor) about the only function that thing serves is when to go into O/D and T/C lock-up. If you have a 12V, my only guess would be the tranny program, but I don't know if it applies to those engines.

 

I just picked up the truck from the dealer, and he is stumped he did mention that he thought it could be the throttle positioning sensor. We will see!

 

you might also have a check valve that is stuck

 

Sorry to bump up an old thread but I am haveing the same problem.

99 CTD Ram 2500 40K miles.


It is/was my Father in laws truck and was doing this just before he died. He had the dodge place check it but they did not find a problem.

 

take a look at all the grounding wires and the main ground. if there is any corrosion it will cause this.

I have been reading up about this and it is an issue that can lead to the need of a new wireing harness due to corrosion.

 

I will take a look at them.

On the same note. my Brother in Law just got an 06 2500 one month in and the wires had corusion and needed replaced.