Question about Dodge Ram 2500

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2001 Dodge Ram 4x4 automatic transmission shift problem. First two shifts are ok. Then the next shift and sometimes the following shift can only be achieved by letting off the throttle for a few moments after getting up to no less than 65 kms per hour. This means that part throttle and medium throttle aceleration will not produce a proper up shift. Down shifts are fine, and kickdown shifts are fine. I had tried to adjust both bands and even changed the throttle position sensor at the recommendation of a Dodge Dealer, but this was a 700 dollar waste of my money! Is there anything I can do? I even changed the tranny with a used one that seemed to do the same thing which is quite unusual don't you think? Please help me, my truck has 350,000 kms on it, but they are not all on this tranny.

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If the truck has 350K Kms on it, replacing the tranny with an used one could have been a right move.
You would probably have needed a new box shortly in any case, this would have costed far more than $700.

Since you have done most of the job already I will spare you my creative writing skills, and I will start listing the possible causes for your problem.

Faulty TPS.
Faulty Shift solenoids.
Slipped component, or faulty tranny box.
Faulty TCM box.
Wrong signal from crankshaft position sensor.

From your description the problem looks like a defective TPS.
I know that the TPS has already be replaced, but it should be tested again , reading OBD codes, and reading volts at TPS terminals.

Even If TPS testing does not show anything wrong, like a sudden voltage change while smothly pressing the accelerator pedal, then the problem may still be TPS.

The TPS can also be tuned up and adjusted using capacitors to give stability to TPS signal.

Modification and tuning are explained on web site below:

Here a description of detailed procedure - Dodge Ram TPS.

If the TPS is not responsible, other common reasons are gearbox internal problems , slipping components and shift solenoid faults.

All this problems belong to the gear box (shift solenoid pack is mounted on valve body).
Since your replaced the tranny box, it is rather unlikely that you are getting any of this problems because of this same defects on new box.

The electronic module controlling the transmission is called TCM. This elaborates the input from sensors, and send signal to tranny solenoids to shift gears.

The TCM can be tested at a Dodge authorized garage using a diagnostic scan reader tool.

Troubles caused by a defective TCM may be difficult to troubleshoot.
Sometimes you will not even get an error code scanning TCM.

Before replacing the transmission control module, all other parts must be tested, including the Crankshaft position sensor that is sending inpulse to TCM.

Resuming, things that you can still do are the following:

Do again an OBDII code reading. This can be done for free at Autozone.
Test the crankshaft position
Test the CPS.
Test again volts at TPS.
If you want do the TPS tune up proposed in the article above.
Test wiring that can affect transmission (TPS, speed sensor, TCS, TCM)
If none of the above will work, then test and eventually replace TCM.

I hope my comment had been helpful, in case do not forget to leave feedback.



Posted on Nov 16, 2009

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