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sprinkles08
sprinkles08, Chrysler/Dodge/Jeep master tech
Category: Dodge
Satisfied Customers: 21962
Experience:  ASE Master and Advanced Certified, Chrysler/Dodge/Jeep Master Certified, Trans and Hybrid Specialist
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I have a 2006 ram 2500 diesel with a 48re. I was

Customer Question

I have a 2006 ram 2500 diesel with a 48re. I was experiencing a shift issue and replaced the governor pressure solenoid and regulator. That took care of the initial problem but now the trans wont shift into overdrive. I replaced the throttle control valve position sensor and the torque converter control solenoid along with the overdrive control solenoid. The torque converter locks up at about 55 mph on flat ground.
Submitted: 1 year ago.
Category: Dodge
Expert:  sprinkles08 replied 1 year ago.

Hello and welcome to JustAnswer!

Lack of fourth gear could be quite a few things ranging from the overdrive solenoid, a valve body issue, overdrive unit damage or a leaking piston, but with the converter locking up so late I'm wondering if the ECM isn't seeing correct vehicle speed. If it thinks the truck is traveling slower than what it is then that will cause the delayed lockup and possibly no overdrive.

Are any fault codes setting in the ABS module or ECM?

What was the original problem?

This problem didn't happen until the valve body was removed?

Customer: replied 1 year ago.
There are no codes, detected by my scanner. My scanner speed indicator matches the speedometer. I never removed the valve body. The original problem was the trans would downshift in a corner and would cause the engine to rev hi before shifting up again. Changing the governor pres. sensor and solenoid took care of that problem but I didnt have overdrive after that. I then changed the od/tcc solenoid and trans throttle valve actuator and no difference. I live in a remote area of wyoming, no dodge dealer or trans shop near.
Expert:  sprinkles08 replied 1 year ago.

Do you have the ability to read pinion factor with the scan tool?

Customer: replied 1 year ago.
Not with the scanner i have, maybe i could get a better scanner . Is there any way i can check for a signal from the ecm the the trans.
Expert:  sprinkles08 replied 1 year ago.

Determining why it isn't shifting is going to require monitoring data to see if it's commanding a shift, and if not, then why.

Do you have a fourth gear actuator test?

Customer: replied 1 year ago.
No. I may have to put to the dealer then. Its about a 1.5 hour drive.
Customer: replied 1 year ago.
Im at work right now and wont b home til next tuesday. When i get home i will c if anybody in my town has a scanner, what all will i need to look at with the scanner
Expert:  sprinkles08 replied 1 year ago.

The first thing you'll want to look at is if it's requesting fourth gear. If not then look at throttle angle, engine load, coolant and trans temp, and vehicle speed to see if something looks out of line. I'd really like to see what it shows for pinion factor in the ABS module.

Customer: replied 1 year ago.
Ok. I will see what i can find out next week. All I can look at in real time, from that list, with my scanner is vehicle speed, engine load and coolant temp. I will get back to you. Thanks.
Customer: replied 1 year ago.
One other thing i noticed but forgot was while doing 65 if i pushed the throttle down, like to pass it downshifted causing high rpm in the engine. I would have thought there would be something to prevent that.
Expert:  sprinkles08 replied 1 year ago.

It definitely won't downshift to second gear at that speed.

How are you determining it's not going into fourth gear?

Customer: replied 1 year ago.
Counting the shifts and watching speedo and tach. At 70 mph it used to run at about 1800 rpm, now at 65 mph it runs at about 2500. When it downshifted my tach went well over redline but just for a second before i got off the throttle and onto the break.
Customer: replied 1 year ago.
The speedo and tach.readings on the dash match the readings on my scanner
Expert:  sprinkles08 replied 1 year ago.

Let's get a look at pinion factor and the other things I mentioned and go from there.

Customer: replied 1 year ago.
Ok. Thanks for the help
Expert:  sprinkles08 replied 1 year ago.

You're welcome!

Customer: replied 1 year ago.
I was just talking with a co-worker and thinking about the pinion factor and temembered something else. When i canged the gov press reg and sensor i also changed the trans output speed sensor, and havent had overdrive since. Could that sensor cause these problems? It wouldn't be the first time a new part was bad.
Expert:  sprinkles08 replied 1 year ago.

It should be setting a P0720 if the output speed sensor signal was missing and it shouldn't just cause a loss of four gear. If you have your old sensor it wouldn't hurt to put it back in though and see what happens.

Customer: replied 1 year ago.
I have the old one. But im still going to get a better scanner. I plan on keeping the truck for a long time.
Expert:  sprinkles08 replied 1 year ago.

Odds are it isn't the sensor but it only take a minute to swap the old one back in.

Customer: replied 1 year ago.
Swapped the output speed sensor and no difference. My new scanner wont show pinion factor, and i cant find a trans temp either. Will do more checking tomorrow
Expert:  sprinkles08 replied 1 year ago.

Ok.

Customer: replied 1 year ago.
This info was gathered on a flat highway with no grade. Throttle angle 47.5%, calculated load 18.7%, engine temperature 199°f, rpm 2648, vehicle speed 65mph. All reading were taken from the scanner not vehicle gauges.
Expert:  sprinkles08 replied 1 year ago.

What is throttle percent with t closed?

Customer: replied 1 year ago.
I will check shortly
Customer: replied 1 year ago.
At idle it is 0.0
Expert:  sprinkles08 replied 1 year ago.

Are you able to see commanded gear?

Customer: replied 1 year ago.
Negative on commanded gear. Im getting a comprehensive component monitoring incomplete notification too. I will go to a local garage monday and c if i can get them to take a ride with me with a different scanner. If i can get them to do it, what other info do u need?
Expert:  sprinkles08 replied 1 year ago.

We need to see whether it's commanding fourth gear or not. If it is then the problem is internal.

I'd also like to look at pinion factor and see if it shows the correct tire size.

Customer: replied 1 year ago.
Tire size is stock size from factory on factory wheels
Expert:  sprinkles08 replied 1 year ago.

You said that you weren't able to check pinion factor?

Customer: replied 1 year ago.
Not able to, just saying that the tires and wheels that r mounted on the truck r factory size. So it should b set right
Expert:  sprinkles08 replied 1 year ago.

It needs to be looked at with a scan tool if fourth gear isn't being commanded.

Customer: replied 1 year ago.
Ok, will try to find a shop here that can check it
Expert:  sprinkles08 replied 1 year ago.

Great!

Customer: replied 1 year ago.
No scanner locally, that will check pinion angle or commanded gear. I will have to drive to another town on my next days off, a week from this wednesday.
Expert:  sprinkles08 replied 1 year ago.

Let me know how it goes!

Customer: replied 1 year ago.
I will. I still want to fix it myself, if possible, or replace my trans if needed. I just dont want to replace the trans and find that its something else.
Expert:  sprinkles08 replied 1 year ago.

I agree, I wouldn't want to replace the trans unless it's definitely necessary.

Customer: replied 1 year ago.
Can't get my truck onto a dealer scanner until the 29th of october.
Expert:  sprinkles08 replied 1 year ago.

Let me know how it goes!

Customer: replied 1 year ago.
Ok. If I have to replace the ecu does it need to be programed once its installed
Expert:  sprinkles08 replied 1 year ago.

A Mopar ECM would come blank and the software would have to be programmed. Either a Mopar or aftermarket would need to have the VIN, mileage and SKIM functions programmed.

Customer: replied 1 year ago.
Ok, thanks
Expert:  sprinkles08 replied 1 year ago.

You're welcome!

Customer: replied 1 year ago.
Dealer said the ecm is telling to trans to shift into overdrive but its not not going and pinion factor it corrent
Customer: replied 1 year ago.
They r recommending a trans replacement
Expert:  sprinkles08 replied 1 year ago.

If it's commanding fourth gear then the problem is definitely internal in the trans. It has to be the solenoid pack, an issue in the valve body, mechanical failure in the overdrive unit, of the overdrive piston leaking. The trans would either need to be replaced or removed and disassembled for inspection.

Customer: replied 1 year ago.
I replaced the solenoid pack. They said the fluid smells slightly burnt and with 243000 miles they recommended a rebuild or replacement. I dont know anything about rebuilding one of these so i would b in over my head to tear into it.
Expert:  sprinkles08 replied 1 year ago.

It's always possible that you got a bad solenoid pack but it's unlikely that you would have two in a row with the same issue. They usually fail electrically rather than mechanically which will set a code and put the trans in limp in.

Customer: replied 1 year ago.
I never did get any codes. If i replace my trans at home will a dealer have to do any programming or anything like that
Expert:  sprinkles08 replied 1 year ago.

No,no programming will need to be done after the trans is replaced.

Customer: replied 1 year ago.
Cool. I appreciate the help and advise
Expert:  sprinkles08 replied 1 year ago.

You're welcome!