i have a 2000 ram 2500 5.9 24v cummins.here is the problem i have.trans burps\in out od only at 48-58 mph no codes in pcm,drive with scanner hooked up no codes found no check trans light on dash,had trans rebuilt by my hd allison trans guy last year thought overdrive unit was going out only last year got so bad had to stop driving. stoped problem for quit a wile now starting up again some times mostly at 48-58 mph only.changed all sensors,new tps i work a lot of p/ups and medium duty trucks,hd diesel rep 22 yrs this one has me stumpt!!! any help would be helpfull thank you 72fj.

 

to the site this is the classic lock and unlock of the converter. Hereis how to fix it.

24 Valve APPS
Rewire Ground Instructions
1994+

Lock-Up-O/D shuttle/hunt

Symptoms: At steady throttle usually at approx 40-50 MPH the tachometer will rise and fall approx 150-200 RPMS as the Torque Converter Clutch engages and dis-engages.

Problem: Electrical noise in the conducting wires running from the PCM (power train control module) to the TPS ( throttle position sensor).

This may be verified by observing a scanner while the complaint is occurring. The PCM will command loc-up on &off, the transmission is only doing what it is being told. This is not a "transmission " problem. Working on the transmission will not fix the problem. The PCM reacts to monitored voltage spikes caused by the TPS power and signal wires picking up electrical noise from other wires in the harness. The primary culprit is the AC voltage produced by the alternator. Replacing TPS’s,sensors, or PCM reflash almost never fixes the problem.

Solution: Make sure both batteries are in good condition. Make sure all battery cable connections are clean and tight. Make sure all ground connections are not corroded, this applies to PCM, TPS, and all ground connections on chassis and engine. After rewire it is sometimes required to "re-learn " the TPS (APPS on 98.5 +). Here’s how: disconnect both batteries for 15 minutes, reconnect batteries, turn ignition switch to run position (do not crank engine), slowly depress the accelerator pedal to the floor and release, turn key off. Now you may start engine and road test to verify complaint is fixed. There is a very rare occurrence of the PCM itself being defective, this is the exception not the rule. Try the most economical fix first!

---AutoMerged DoublePost---

http://www.suncoastconverters.com/im...d%20rewire.pdf

Rewiring instructions.

 

turbo20psi i will check it out,makes sense becaus i new somthing was telling trans to go haywire not the trans its selft.will do some checking and let you know.thank you!!!

 

No problem The above post is the cheap fix you could buy a DTT noise filter also,which in most cases is not needed.

 

got a problem with my 2001 5.9 cummins 24 valves. engine breaks down under load or acceleration. changed the fuel heater. nothing.started in 25 degree weather

 

I had the same problem, fixed now by doing the above and added dielectric grease on all connections for even better grounding. Ive also heard sometimes you have to seperate out the alternator wires and isolate them. That is where the noise is coming from that is causing the problem. Some wrap then in tin foil then tape. I didnt have to go that far.