Diesel Bombers - Transmission help

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- 24 Valve 2nd Gen Dodge Cummins 98.5-02 (https://www.dieselbombers.com/24-valve-2nd-gen-dodge-cummins-98-5-02/)

- - Transmission help (https://www.dieselbombers.com/24-valve-2nd-gen-dodge-cummins-98-5-02/108696-transmission-help.html)

Transmission help

I noticed this week that my truck has less power its not as noticeable at low speeds. The transmission does not want to make that last shift between 30 and 40 mph. I have to really get into it to where the engine is working more than it should or almost completely let off the throttle. I've also noticed that my fuel mileage has suffered considerably because of it. I use the truck mostly for commuting to work taking the same route and it is burning more than it should. I want to know if its something I can fix before I take it to a shop for something stupid. I'd appreciate any help you can give me, thanks.

I'd try resetting the apps def worth a shot.

Procedure
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

ck your brakes and drive line, make sure everything is moving freely .

I think the only thing in the 47re that is electrically controlled is the torque converter lockup. So if you are having shift problems I would recommend a fluid/filter change first. Also the throttle valve cable for the trans might need to be adjusted here is a link for that https://www.dieselbombers.com/98-5-0...nsmission.html Another thing you might try is a torque converter lockup switch. When the t/c is locked it makes a solid connection between the engine and trans, instead of fluid coupling, which will get you better mileage. With the switch you can lock the t/c in second gear and it will shift up through all the gears as normal but it will not down shift until the switch is turned off. Also if the switch is on and you come to a stop the engine will stall out. A t/c lockup switch is not recommended unless you have a built trans but I think as long as you take it easy a t/c switch would be fine on a stock trans. Here is how to install the switch http://www.tstproducts.com/Torque%20...p%20Switch.pdf

The RE uses a combination of hydraulic pressure and PCM inputs

I put this to another forum and got similar responses. I just did a fluid and filter change last spring when I swapped in the Borg Warner solenoid. Do I have another problem with needing new fluid this soon!?

Well I changed filter and tcc solenoid Sunday. I drove home with hardly any improvement. I checked fluid today and filled to 'ok' mark (was missing a quart and a half). I also replaced trams relay under hood. Nothing. Made slight adjustment to tv cable but set it back when nothing changed. The solenoid changed allowed me to clear the p0743 at advance auto parts and no more codes came up. If anyone has any idea why I'm still lacking power and rc won't lock up let me know. Thanks.

Check your fuel pressure and or turbo boost. I have seen a plugged fuel filter cause similar issues also if the turbo is not boosting properly then the motor will not rev. If the motor is struggling to rev up, It will take more throttle opening to get up to speed. With the throttle opened more, the shifts and lock up will be delayed. Make sure everything else is working properly then go back and look at the transmission.

I adjusted the tv cable but it still feels off. The shifts are weak. I replaced the trans relay under the hood and took it to advanced auto parts to use the obd scanner. Now it's pulling these three codes p1765 p0753 and p0743. If any one has any idea please chime in. Tomorrow I will get another relay just in case I lucked out with a cruddy one.

PO753 is 3-4 shift relay
PO743 is Torque converter clutch solenoid circuit.
P1765 is trans relay 12 volt supply circuit.

First thing I would do would be to check to see if you are getting 12 volts to the trans relay at the load circuit. If you are, check and see if the relay is working. If you have a scan tool with actuator capability, that makes it easier. If not check it with the engine running. It should click on when running. If this is working shut the engine off and place a jumper wire across the load branch of the relay plug. 12 volts should be on one side and the other side will go down to the transmission plug on the side of the trans. Check and see if you have power to the plug. This is where I suspect the problem may be. It is very common for the wiring at the plug to pull the insulation back and short the wires together on top of the plug. If this is the case, you can go to Dodge and buy a transmission wiring pig tail. This will come with the wires and the plastic plug. I usually cut one wire at a time and wire each pin in order. After this plug it in and recheck.
It has been a few years now since I worked at Dodge but I will see if I can find some more info

My truck was slamming into gears and 3rd and 4th felt weak. i decided to do a band adjustment and it made a big difference between shifting and lockup in O/D. it is recommended to do every 20000 miles on chrysler/dodge transmissions Try doing that, it could help and takes maybe 2 hours.

https://www.atsdiesel.com/additional...ent%20v1.0.pdf

Step by step process, fairly easy to do just need trans oil and gasket when done. Also find a torque wrench for 72 in. pounds. :tu:

Thanks to both of you. I will try checking the wiring fort then the bands. My next question is with this being my daily driver will driving easy hurt anything until weekend when I can get to it?!

You may be able to get away with driving it easy but I would avoid it if possible.

If you want you can take you oil to a transmission shop and tell them to check it. They can give you some input on what might be happening. But yea I wouldnt drive on it but if you do drive it like a grandpa. If you do the band adjustment let me know how it goes!:c:

Thanks everyone for the advice. I ordered a new tcc external harness connector and pig tails

Well I replaced the connector on outside of transmission with little improvement. Still throwing p0743 code and the guy at advanced auto is sure the trans is done. Still lacks power, shifts are in the wrong spots, mileage is bad, and I hear the trans rattling. Probably have aamco look at it. Any ideas that might help?!

I think the torque converter took a crap. Does it only rattle at certain speed? My dads truck rattles horribly but he still plows and turns the radio up louder. :td: but it's hard to diagnose anything over the Internet. Did you adjust the bands?

Before you can condemn anything you need to fix that P1765 code. The other codes will be caused by that code. If you can not get 12 volts to the solenoids, they will not do anything. Do you have 12 volts down at the trans connector. Does your trans relay turn on? Is the transmission fuse good? Does it have 12 volts?

Once you get that in line you can look at other issues. With that problem, you will be running in limp mode. It will take off in 2nd gear and lack power and never make shifts. You will have reverse as it is a manual valve in the transmission.

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Here is the factory diagnostics for this code.
P-1765 TRANS 12 VOLT SUPPLY RELAY CTRL CIRCUIT

When Monitored and Set Condition:

P-1765 TRANS 12 VOLT SUPPLY RELAY CTRL CIRCUIT

When Monitored: Continuously with the Key on.

Set Condition: This code is set if the voltage detected on the Transmission Relay Control

Circuit at the PCM is different than the expected voltage for 3 seconds.

POSSIBLE CAUSES

GENERATOR SOURCE CIRCUIT OPEN

TRANS RELAY CONTROL CIRCUIT OPEN

TRANS RELAY CONTROL CIRCUIT SHORT TO GROUND

TRANS CONTROL RELAY WIRING HARNESS

POWERTRAIN CONTROL MODULE

TRANSMISSION CONTROL RELAY

TRANS CONTROL RELAY WIRING HARNESS INTERMITTENT

TEST ACTION APPLICABILITY

1 Ignition On, Engine Not Running.

Using the DRB, read the DTC's.

Is the DTC specific good trip displayed and equal to 0?

All

Yes ® Go To 2

No ® Go To 8

2 This code is present at this time.

Ignition On, Engine Not Running.

With the DRB, actuate the Transmission Control Relay.

Is the Transmission Control Relay clicking?

All

Yes ® Go To 8

No ® Go To 3

3 Ignition Off.

Disconnect the Transmission Control Relay.

Note: Check connectors - Clean/repair as necessary.

Ignition On, Engine Not Running.

With the DRB, actuate the Generator Field.

Using a Voltmeter, measure the voltage at the Generator Source Circuit in the Relay

Connector.

Is the voltage above 10.0 volts?

All

Yes ® Go To 4

No ® Repair the open Generator Source Circuit.

Perform Powertrain Verification Test VER-5A.

592

TRANSMISSION

TEST ACTION APPLICABILITY

4 Ignition Off.

Disconnect the Transmission Control Relay.

Disconnect the Powertrain Control Module White Connector.

Note: Check connectors - Clean/repair as necessary.

Using an Ohmmeter, measure the resistance of the Transmission Relay Control

Circuit from the Relay Connector to the PCM.

Is the resistance below 5.0 ohms?

All

Yes ® Go To 5

No ® Repair the open Transmission Relay Control Circuit.

Perform Powertrain Verification Test VER-5A.

5 Ignition Off.

Disconnect the Transmission Control Relay.

Disconnect the Powertrain Control Module White Connector.

Note: Check connectors - Clean/repair as necessary.

Using an Ohmmeter, measure the resistance between the Transmission Relay

Control Circuit and ground.

Is the resistance below 5.0 ohms?

All

Yes ® Repair the Transmission Relay Control Circuit for a short to

ground.

Perform Powertrain Verification Test VER-5A.

No ® Go To 6

6 Ignition Off.

Disconnect the Transmission Control Relay.

Note: Check connectors - Clean/repair as necessary.

Using an Ohmmeter, measure the resistance between Terminals 85 and 86 of the

Transmission Control Relay.

Is the resistance below 100.0 ohms?

All

Yes ® Go To 7

No ® Replace the Transmission Control Relay.

Perform Powertrain Verification Test VER-5A.

7 If there are no potential causes remaining.

View repair options.

All

Repair

Replace the Powertrain Control Module.

Perform Powertrain Verification Test VER-5A.

8 At this time, the condition required to set the code is not present.

Using the DRB, go to the freeze frame screen. Make sure the 9caused by DTC9 P code

matches the code on the DTC screen. Use this information to help determine the

conditions when the code was set.

Using the Schematic as a guide, inspect the Wiring and Connectors.

Were any problems found?

All

Yes ® Repair as necessary.

Perform Powertrain Verification Test VER-5A.

No ® Go To 9

593

TRANSMISSION

P-1765 TRANS 12 VOLT SUPPLY RELAY CTRL CIRCUIT - Continued

TEST ACTION APPLICABILITY

9 Ignition On, Engine Not Running

With the DRB, actuate the Transmission Control Relay.

While DRB is actuating, wiggle theWiring Harness from the Relay to the Powertrain

Control Module.

Did the wiggling interrupt the clicking?

All

Yes ® Repair as necessary where wiggling caused the clicking to be

interrupted.

Perform Powertrain Verification Test VER-5A.

No ® Visually inspect related Wire Harness Connectors & Harnesses.

Refer to any T.S.B.'s that may apply.

Perform Powertrain Verification Test VER-5A.

594

TRANSMISSION

P-1765 TRANS 12 VOLT SUPPLY RELAY CTRL CIRCUIT - Continued

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The other codes also have trans relay open as possible causes so I would chase this one. If you were near Bakersfield CA, I would be happy to help you with it.

I'm only pulling the p0743 code now