48RE Trans Issue

Possibly the PR valve sticking in the vb??

I would pull the vb and check it out.

I have used quite a few of the borg warner solenoids with no issue. I also have the GM one in my truck with no issue.

I am not sure what the heck is going on......it seems to possibly get a tad worse as the fluid gets warmer

I cannot get the truck in to the shop till Wednesday, due to my work schedule

duck_04 said:

It's in limp mode

Click to expand...

Someone on another forum said it might also be in limp mode, and that it is caused by the aftermarket solenoids I have been running......the PCM/ECM is not programmed to handle the higher pressure ratings and causing the trans to go into limp mode?

The Goerend VB originally came with a stock Mopar solenoid. After I upgraded to the larger BW solenoid and now the even larger GM Solenoid is when all my issues started

Someone suggested this:

Dodge 47RE/48RE Transmission Valve Body Assistant VBA

Valve Body Assistant:

"This item wires into the computer harness and prevents the computer from throwing your automatic transmission into "limp mode" with higher pressure valve bodies.

When a high-pressure valve body is installed in a truck, the higher governor pressure is detected by the computer and the transmission is put into limp mode to "protect it".
Limp mode causes your truck to start out in 3rd gear and not upshift or lock up the torque converter."

I have the similar problems, after the oil warms up trans do not change back to 1 gear, it will start with second - limp home mode

So far I have changed the governor solenoid to new style BW and adjust the voltage (I have DTT voltage regulator), still the same prblem :what:


I am looking possibility to run the truck with connected scanner, maybe it will give more infromation

I'm kinda new here, but have seen comments regarding Goerend VB and the HD solinoid incompatibility. Seemed to be he only wants the BW stuff.

I called and talked with Craig at Goerend about my issues

He wasn't too confident about the VBA fix or the fact that a check ball inside the VB was sticking or causing an issue

He suggested taking it back to the shop and see if the can check the "desired" vs the "actual" governor pressure, and go from there

So, I am going to try to limp to the shop when there is less traffic......

I wonder for $20 if it is worth changing the output shaft speed sensor.....

I removed both negative battery cables (cleaned all terminals also) from the truck and installed the new Duralast output shaft speed sensor

It uses a 1" deep well socket for install, which took under 5 minutes, if that

I lost maybe 2 ounces of ATF in the process

I also used the APPS reset/recallibration method posted here, even though I have heard this only applies to 2ND Gen trucks with APPS:

FAQ

I am letting it sit for 30 minutes and will report back this afternoon, after some range time at my department.....

Range day got pushed back an hour, so I took the truck for a spin

Still revs very high, to about 1,500-1,600 when taking off from a stop and I have the 5 mph "bump" when slowing down

No codes......time to take the truck in

Shop had the truck since Thursday

They called today and they were again getting poor readings from the pressure solenoid

Once again, they swapped out BOTH the solenoid and the transducer for new units

The insides were again spotless

They drove it all day Monday and it performed flawlessly.......great pressure readings too

Today, the shop owner took it on another drive and it 'acted up' on him, same symptoms I had

So, he rescanned it again and found poor pressure readings yet again

So, off came the pan again.......he decided to open up the transducer, which he said he has never done before

He found a little microchip inside was blown

He then went back through all thr previous 3-4 old transducers.........they were also ALL BLOWN

Why would these keep blowing? He wants me to call Goerend tomorrow and see if possibly something is bad/wrong with the valve body, that is creating pressure spikes and blowing the transducers

I would think it would be more of an electrical issue if you have having a problem like this. Check all the wiring over really good yet?

I called Goerend again this morning and again, spoke with Craig

I updated him on the ongoing issues and he said the transducers on the 48RE truck do not like ANY voltage spikes, at all

He said to install a completely new overdriver and lockup solenoid wiring harness.....to rule out ANY change of a short, bad wire(s), or a faulty connector

He said the APPS Isolator/Filter would not be responsible for the issues, because it it basically creating another more effective ground

I called the local trans shop and told them to order and install the new wiring harness, which should be done tomorrow

Crossing my fingers......

I picked up my truck today........and it appears to be fixed. They replaced the wiring harness for the overdrive and lockup solenoid and replaced the lost fluid

They scanned it again and everything was fine......the shop owner had it for 4 days driving it around. No issues

It appears the internal wiring harness was bad......I drove the truck home and it appears to be fine!

Total with parts and labor was a mere $200.11

Here are pics of the inside of the transducer, to show where it was blowing at.....you can see the round shiny metal "chip", well after they blow, there is a pinhole in the center of this "Chip"

Hope it is fixed!

D45, is everything still working right without any more problems? Low and behold, almost exact same problem here! I haven't replaced the new solenoid and switch with 2nd new one, but my 1st time dropping a trans pan, swapped the solenoid and switch, adjusted rear band, and HOLY CRAP I thought (am still uncertain if I jacked something up). Livid isn't the word for my daily driver, 2 pan drops, fluid, and headache and time spent beating my head against a wall.

Mine is hanging in 2nd gear, and will rev past 3000rpm without shifting to 3rd gear, but it will shift into 3rd and 4th if I let of accelerator completely until it loses enough pressure or something. I can only get it to shift normally if I manually hit TC Lockup Switch in. 2nd gear, and worst is it actually downshifts into 2nd gear when I try mod to hi acceleration. Also presents with a slowing down 5mph slight downshift bump. Tried DTT Shift Enhanser thru all settings and tow haul, but only worsen the amount of let off to get it to shift on its own to 3rd and 4th, ironically it does not do this if not taking of from a stop.... GOOD NEWS IS, 2-3 FLARE IS HISTORY.

Sorry to post on dead thread, but recent and almost identical, and looking to ensure all is good with OP

Yes, after replacing the lockup and over drive wiring harness the issue was fixed

No issues since!

Im having the same issues, any chance you could fill me in on the exact name or part numbers that you had to replace to get the issue resolved. Im pretty sure i know which ones you mean, but just want to make sure. Thanks

No part numbers, sorry

If you search for "overdrive and lockup solenoid wiring harness".....there is only one of these

Also, those transducers are junk china junk typically, make sure you know what brand you are getting

ok thanks, what brand do you recommend?

Any will do I'm sure......they're most likely all the same, just different manufacturers

D45 said:

Someone on another forum said it might also be in limp mode, and that it is caused by the aftermarket solenoids I have been running......the PCM/ECM is not programmed to handle the higher pressure ratings and causing the trans to go into limp mode?



The Goerend VB originally came with a stock Mopar solenoid. After I upgraded to the larger BW solenoid and now the even larger GM Solenoid is when all my issues started



Someone suggested this:



Dodge 47RE/48RE Transmission Valve Body Assistant VBA



Valve Body Assistant:



"This item wires into the computer harness and prevents the computer from throwing your automatic transmission into "limp mode" with higher pressure valve bodies.



When a high-pressure valve body is installed in a truck, the higher governor pressure is detected by the computer and the transmission is put into limp mode to "protect it".

Limp mode causes your truck to start out in 3rd gear and not upshift or lock up the torque converter."

Click to expand...

U can remove your trans relay and install a fused jumper, then the computer can't throw it in limp. Works on 05 and down


Sent from my iPhone using Tapatalk