2001 Dodge ram 2500 cummins, 47re auto
a few weeks ago had a customers truck couldnt access body computer and the truck would not shift properly
" truck would shift normally after batteries were disconnected overnight, and then after it was shut off, and started again it would not upshit you had to put it from D to N to D to shift from 1 st to 2nd gear and then D to N to D to get it to shift from 2nd to 3rd but 4th will always upshift. also there is alot of pressure on the throttle when this irratic problem happens ( presumably the TV/kickdown Cable to the tranny ) "
I rebuilt this tranmission ( 47RE) 2200 miles ago all electronics in it were replaced with Mopar parts. we replaced the PCU ( computer on firewall ) now have body control module access but now we also have 2 new codes and still the same shifting problems

1693 - The companion engine control module has shown a fault.
1698 - No messages received from the electronic transmission control module or the Aisin transmission controller.

between 3 mechanics ( 2 daimler chrylser certified ) 1 ASE master and 3 trans techs with all of us over 10 + years experiance each we cant seem to figure out whats causing all this anyone have any ideas or had similar problems this has been goig on for 2 weeks now and the customer really needs his truck back
Any Help is greatly appreciated

 

Do a diagnostic on the APPS, and if it is good trace the wire loom from the APPS all the way back to the connectors at the transmission. Look for corrosion from the use of a pressure washer, or burn or break in the wires. Then work to the PCM, and really pay attention to the socket for white fuzz or a bent pin.

Given you get a good response after overnight disconnect, I would look to the APPS as being shot.

If it is not the APPS, burned loom, or bad connector; then the electronic governor controller on the valve body is bad or has a bad internal connection.

One other thing, look for an aftermarket fueling box addition, and remove it before chasing any other problem.

 

we already checked the looms and connecter. Cleaned the ground connectors when computer was changed.It has a BG fuel pump in place of the factory lift pump... ( no electronic fueling boxes though )
before we had all these issues he had a problem it wouldnt use 1st gear ever replaced the governor and solinoid in trans and that corrected that. Whats the possiblity of one or the other failing after only 2k miles ?
also governor pressure is very irratic when this happens anywhere from 17 - 120 PSI @ 30 MPH
and does anyone have a clue what code 1698 would be refering too ? cause to my knowledge trans controls are all located in the PCU

Thanks

 

This is odd!! I just got on here to search this problem I am having with my 2001 also. Mine is doing nearly the same thing. Mine shifts good from 1st to 2nd, then doesn't want to shift to drive. I can throttle hard and wind out in 2nd, then let off and coast and it will usually shift. Or I can pull out very slowly with very little throttle and it will sometimes shift Ok. Also, I could sometimes do the D - N then back to drive and it would shift. Mine also set the 1693 code, which according to the mechanic referred to another module, and indicated the MAP sensor/low boost condition. My ASE mechanic had the scanner on it for over an hour today with no definite cause found. TPS-good, speed sensor-good, pressures seemed to be ok, Once the truck gets in drive, it runs fine, overdrive is perfect.
I, like the other guy, just had my tranny rebuilt about 2000 miles ago, all DTT parts, rebuild kit, valve body, torque conv. both governor/pressure solenoids/sensors installed new, and new speed sensor.
Any advise/help would be appreciated

 

We took the truck out for over 2 hours tonight scanning every bit piece by piece ganked the valve body today, switched in another PCU computer and new wiring harness and still same problem exists got a code 1693 a 1698 but the 1698 has been cleared believe to be todo with the computer swap and also got a 234 ? i believe it is with boost pressure too high have 3 trans shops 2 dealerships daimler and 2 computer places working on this and we also have a 98 minivan with same problem
im starting to have a feeling its the link from the ECU ( comp on engine ) to the PCM ( firewall computer )

oldmandan-1 when hooked upto a OBD 2 scanner can you access the body Computer protion on the scanner we still cannot with 2 diffrent PCU's

SOMEONE HELP

 

Limp mode.
Governor pressure sensor and transducer. They are on the Valve body.
Any dealer trained service man should suspect this.

 

.....not shifting into 3 unless letting off throttle is a classic symptom of the front clutch piston retainer seal leaking excessively. You may want to drop the valve body and air check the front clutch pack. If it seems to be sealing I would suspect the valve body.

 

Thanks for the info guys.....
J BODY - Had the entire trans apart everything in mint shape if i disconnect the computer and reset itll work fine for about 40 mins

j-fox - TCM Computer says the truck is not in limp mode ( even though it is acting that way )
we have replaces the governor solinoid and pressure sensor 3 new sets just to make sure we didnt get 1 bad one ! and ive had the valve body down and apart im thinking take it outta the truck one more time tear it all to pieces

2 people are having this same problem now and possibly one guy on this forum also and we all jave a 1693 code in the TCM point to a 0236 or 0234 code in the ECM on the engine
( is there anyway a boost code could relate to the shifting ? )
TPS has been checked everythign has been checked this trucks been torn to pieces and reassmbled piece by piece .

ANY help greatly appreciated

 

Wow 2 different guys with 2 problems on same thread, (heres my 2 cents), with the 1698 code there is a problem in the communication between ecm and pcm(check for bad connection/pin at both computers), or bad trans control module, or even pcm. Those shifting symptoms definately sound like Governor solenoid and/or transducer. If you have a high end scanner(like snap on), you can retrieve any code in tranny also, such as gov too low or too high voltage(they are a fairly common problem).

If throttle feels tight, check for proper adjustment of trans cable(sounds too tight, it should almost move instantly with the throttle), this can also cause erratic shifting. Does the trans shift ok when cold, but worse as temps go up? Is trans running hotter than normal temps? If it is I would suspect an internally leaking valve body, caused by any one of these problems- cracked/sticking/bypassing/overtightened/distorted valve body. Try replacing entire valve body even with a known stock good one to eliminate it.

Code 234 is Turbo boost limit too high(check wastegate for sticking or blocked/plugged off/disabled)
Code 236 is Map sensor too high for too long(again wastegate issue)


If no other codes show up in trans(with high end scanner), then it is probably a mechanical problem, such as the valve body(as stated above), bands out of adjustment, and/or cable. Hope this helps to narrow it down.

 

.......sorry, my comments were quoted to "oldmandan-1"'s prob. Yours pretty much confuses the poo out of me.

 

My posting or Wolf_fighters confused you? Hope it wasn't mine while trying to help both on the same posting.