Engine/Transmission (1998.5 - 2002) Lockup problems on an 01' 2500

[Lonestar]

I'm trying to help out a friend who has an 01 2500 with a 47re. transmission shifts great, TC seems to be fine, so I'm thinking this is an electronc problem.

At 45mph when the truck goes into Lock Up, the transmission just bounces in and out continually. I have heard of trucks and even felt trucks do this to some degree, but this one is terrible. It never makes a full L. U. before bouncing out and immediately trying to L. U. again. The only speeds this occurs is between 45 and 51-52mph.

Any help would be greatly appreciated.



KEEP ON TRUCKIN'

Lonestar

 

[MDW]

Could be a few things but I would check out the TPS first

 

[59Turbo]

It might be a bad brake light switch. If the pcm thinks your touching the brake it will unlock the converter.

 

[AKAMAC]

Call DTT they have a filter to fix this, costs about 50 bucks.

 

[DieselMinded]

Give this a try.





This procedure has shown to help 24 valve ISB engines. It is basically teaching the fly by wire accelerator on these trucks to reread the position of the pedal and it's limits. Most complaints this will help with is poor acceleration, improper shifting, bucking in 5 and 6 speeds. Has been known to increase fuel mileage in some instances.



1. Set parking brake

2. Disconnect negative battery cables on both batteries

3. Turn ignition key to run(to drain any remaining capacitors)

4. Let truck sit for 30 minutes( this is the recommended minimum)

5. Return ignition to OFF position

6. Reconnect both batteries and secure, not a timed event

7. Turn key to run position(not start) and depress accelerator pedal slowly all the way to the floor

8. Allow pedal to return to top position slowly

9. Turn ignition switch OFF

10. Release parking brake







DM

 

[Lonestar]

Thanks for the tips folks. I'll try some of these tomorrow and see if we can get this fixed. Man I love this site.



KEEP ON TRUCKIN'

Lonestar

 

[magaliasram]

I believe the problem to be with the grounding of the APPS. I started having this problem about 45000 miles ago. At first I just did the reset and it helped but soon returned. Then I decided the only thing that could have changed since the truck was new may be the grounds getting dirty. So I removed the Negitive Battery Cables and while they were off I cleaned every ground on the truck. Problem dissappeared for almost a year. When it came back I again cleaned the grounds and again it worked great. When it happened the third time I decided to make a ground to the APPS using the hole in the front of the unit. I tapped the hole and made up a 14 guage wire to run from the tapped hole to the negitive post on the driver side battery. This has been working for over a year now and much cheaper than the filter that the truck didn't need to have when it was new. Don't forget that you still need to reset the APPS when you hook the batteries back up.