[a1freebu]

Update:
The transmission shop pulled the codes and they were the exact same codes I originally came in with P0734 and P0792 . I left the car with them, they reflashed the computer, but the codes came back on as I pulled away from the shop.
I took it back to the shop they, replaced the TRS, drove it around, light came on 60 miles later. The shop pulled the codes and they were the same codes. Frustrated I left and asked them to do research as I was not wanting to come back. I took it back to the shop, who did further research and found someone in Texas with the same problem as I. Through what he had found, they replaced a check ball valve that was in one of the pistons that is not a standard rebuild part. They took the old ball valve and pressured tested and found it was leaking. So far after 200 miles, the light has not come back on.

I give it to the shop they provided me with a rental car and were relentless on fixing the problem.

 

[cjrafile]

whats the name of the shop?

i would love to know which shop was working on this as i have the exact same problem with mine, down to the tee the same problem to find out what they did, can you post the trans shop name and location so i can call them?>

 

[pvfjr]

I've had the same codes (P0792 and P0734) with my newly acquired Routan. Alternator ripple was fine, all the solenoids and wires check out, and the speed sensors were replaced with no change. Research pointed me toward the low clutch drum sealing-ring lands in the compounder, so I pulled it out. It actually turned out to be a damaged seal on the low clutch apply piston. I made a video if anyone wants to see the insides.

 

[jforrester]

UPDATE: I took my T&C back to the dealer (after the transmission rebuild) to have them solve this mystery problem. They had it for 1.5 weeks and could find nothing but the wires I had bypassed during my troubleshooting. I had them rewire the sensors and they then suspected the TRS(Transmission Range Sensor) switch because of the instrument cluster indication. They asked me if the Compounder was replaced during the rebuild and I informed them that it was rebuilt but not replaced. They then pull the side cover off to look at the TRS and wiring. When the pulled the cover they said that they found chips in the pan and that it looked to be coming from the Compounder. They siad the the wiring looked ok and gave me an estimate for a Compounder inspection. I called my transmission mechanic(He rebuilt this trans) and he suggested that I bring it back to him because, "you hired me to do the rebuild and I should complete the work". That kind of integrity is rare nowadays, but I digress. My trans mechanic pulled the pans and could find no evidence of chips or fuzz. He proceeded to pull the tranny and go through it to ensure no contamination existed. He then pulled the Compounder out and apart and it looked like new. He mic'd out all the components and checked for warpage but the compounder was perfect. He had another rebuild kit in his shop and he rebuilt the compounder for a second time, just to be sure. He put it back together and replaced the TRS while re-assemling it, to fix the boxes around the trans position indication on the instrument cluster. (the indication problem started after the transmission rebuild, so my trans mech said he would replace that part antway as he did not catch that problem when he test drove it after the rebuild) When he went to test drive the van, the boxes around the indicators were still there. A little frustrated he went back through what he did on the original rebuild and he noted that he had replaced the solendoid body as a possible cause for the transmission codes(P0734 & P0792) I had been getting. Since all the signals from the TRS go throught the solenoid body connector he put a new solenoid body on my transmission and this fixed the indication issue. he then test drove the van and the P0734 & P0792 codes did not reappear. He drove the van for 10-15 mile with no problems (these codes would set within 5 miles everytime before). I picked the van up on Christmas Eve and it has been working great for the last week. So it looks like the P0734 & P0792 codes were corrected by the replacement of the TRS. As unlikely as that sounds, it is the only part, that was changed, which caused a change in the trouble codes.
If the TRS was the problem then I wonder how many remanufactured transmission were replaced for this simular issue, as a remanufactured unit would have a new TRS installed?
$4000.00 fix for a $30.00 part?
I am just happy that my T&C is back on the road and I will update should this problem rear it's ugly head again
Kwinters: something to look at, I believe you could change this at home and the part is inexpensive so no harm no foul if it doen't help

So what was the fix for this the connector?

 

[ronaldinio]

Hello all.
Chiming in to hopefully help out someone down the line.

Surprised no one has mentioned the transmission firmware update.
Updates timings for all shifts and several harsh shifts (I only ever use ECO mode on highway after I am in a higher gear because of it) didn't know there was this update.
Seems it was never done on this vehicle. Going to get it done tomorrow. Likely played a part in this transmissions early demise having made harder than it should shifts at all points in it's lifetime.

2011 T&C Limited nearly mint condition, got it for $7k usd last fall.
Van only has 45k miles.
Changed fluid and filter at 38k miles a month after purchase (with half bottle lucas because of those hard shifts mentioned from the firmware update).
Always had a jolt into D when it was ran nearby like to the post office. Then starting it again and going into D when it was 'warm' would do it. When hot or cold it didn't do this. But it showed something out of the ideal was at play from the beginning.

This week when 5 hrs from home got CE light,
Bluedriver shows codes:
P0734 (gear 4 incorrect ratio)
P0792 (compounder speed ratio error)

Drove carefully and found no issues, seemed to shift to every gear except 4th which didn't make much of a problem.
Shifting is pretty smooth.
Drove all the way home at 71mph. Almost home and stepped on it up to 93mph to see what might happen. No issues.

Decided to try replacing the input shaft speed sensor and the code went away on startup. Drove it through the range and went through all gears pretty smooth (including 4th).
Code came back on shortly after, maybe skipping 4th gear when the code is on but not certain of that.

There is also a sound I haven't heard before this happened, when putting ear above the transmission (can't hear it as much below it)
It is the same sound I heard on old van when a relay died - it is the same kind of 'click pop' like the bad relay, in park, about every 10 seconds - regardless of RPM.

Do I go for a rebuild or not, is the question. Mainly given there is no real mechanical problem showing itself yet.
But the cost of the vehicle and it's real use value given fully loaded and everything else is great, makes it easy to justify.
Was planning to drive across the country next month.

Rebuild notes from research:
-replace the torque converter with rebuilt one (the clutch material inside wears out with age just like the clutches)
-replace the lower drum with updated one with notches in rings
-closely inspect transmission range sensor
-replace the solenoid pack
-replace the TCC solenoid
-replace the transducer (sensor?)
-replace the coolant hoses
-clean everything inside
-measure the 3 check ball valves for any loss of size and replace if they aren't at full spec
-flush the coolant lines/radiator
-replace the pan with Dorman drain plug pan for easier future filter changes/ use a gasket ONLY if you don't want a mess doing future filter changes
-replace the piston in the lower drum with the new one (added this line after rebuild - see post below)


Edit:
1st drive since the day this happened... on a 5 hour errand trip there were 2 times where it seemed a slight hesitation in shift around 3-4-5. Checked bluedriver again and now also code PO733 (3rd gear ratio) pending code. Then after half of the trip reverse definitely shows its problems.. the lever shifts fine but once you remove the brake and the vehicle starts moving it really hesitates/slips as it starts moving.
The commonly breaking old model drum wear out. I estimate 10 or less reverse's before it won't for good.
So.. a rebuild it is.

 

[gigem01]

I've had the same codes (P0792 and P0734) with my newly acquired Routan. Alternator ripple was fine, all the solenoids and wires check out, and the speed sensors were replaced with no change. Research pointed me toward the low clutch drum sealing-ring lands in the compounder, so I pulled it out. It actually turned out to be a damaged seal on the low clutch apply piston. I made a video if anyone wants to see the insides.

Great video. Thanks for sharing. All these resources weren't around back when I had all my 62TE issues. First it started going into limp mode and I had to get a new transmission harness connector spliced in.
Then several years later, my compounder died and I had my transmission rebuilt. Within a year later the solenoid pack died and they replaced that under warranty. The other thing to note is I had a very intermittent no-start condition later. It would just click when I tried to start it. That was fixed by opening up the 62TE again to replace the Transmission Range Sensor. You may want to watch out for that too. You could start it immediately by shifting into Neutral.

 

[ronaldinio]

To provide an update of accomplishment, it was the seal on the low drum piston just like pvfjr found. Causing the fluid pressure behind it to pass by, causing the system to increase the line pressure and make for problems in moving the clutches into place properly. Everything else was in good looking condition. However the fluid was loaded with aluminum particles. The mechanic said since nothing else looked worn out, it could likely have been from inside the torque converter.

Seems they (mopar) have actually updated this part too, not just the lower drum/rings, the new piston seal is brown and is nearly double the thickness as the old seal. Did not encounter anyone mentioning this is any of the youtube videos research marathon.

To conclude, this likely happened from being 9 years old and a weak part installed from the factory in these vehicles from the beginning. As an added note the mechanic said to never use lucas or any atf additives, said they soften the seals and cause things like this to happen sooner (mainly on already weak parts). Said only use them if your near the end of the life of your vehicle and something is failing in the trans and you want to squeeze a bit more life out of it before it fails and becomes a scrap or rebuild.

May all your transmissions be healthy and happy 🧙‍♂️

 

[jemneye1]

I also wanted to thank you for always following through with a thorough description of what you did. I love my T&C and want her to live forever.

 

[soorachomy2011]

I have a 2010 Town and Country Touring 3.8 with 105K miles. Last week the check engine light came on and the transmission went into limp mode. I pulled codes P0733, P0734, P0792, P0733 pb, P0734 pb and P0793 pb. I reset the codes and after 3-5 miles the check end light again but now only P0734, P0792, P0734 pb and P0792 pb are set. i had the transmission fluid and filter changed, I replaced the input shaft sensor, and cleaned the output shaft sensor. The fluid looked a little dirty and the magnet in the pan had normal fuzz. Codes reset and after 3-5 miles the same codes come up again and trans goes to limp mode but now if I turn off the van and restart it will shift normal and the check engine light is still on, another 3-5 miles and it will go into limp mode. I am considering changing the output sensor and the transfer shaft speed sensor to eliminate bad signals. I am not sure if it is electrical in nature or an internal issue. Any help or suggestions will be greatly appreciated.

..now I have the same problem can you tell me if you have fixed yours and what was the issue please ?

 

[jemneye1]

UPDATE: I took my T&C back to the dealer (after the transmission rebuild) to have them solve this mystery problem. They had it for 1.5 weeks and could find nothing but the wires I had bypassed during my troubleshooting. I had them rewire the sensors and they then suspected the TRS(Transmission Range Sensor) switch because of the instrument cluster indication. They asked me if the Compounder was replaced during the rebuild and I informed them that it was rebuilt but not replaced. They then pull the side cover off to look at the TRS and wiring. When the pulled the cover they said that they found chips in the pan and that it looked to be coming from the Compounder. They siad the the wiring looked ok and gave me an estimate for a Compounder inspection. I called my transmission mechanic(He rebuilt this trans) and he suggested that I bring it back to him because, "you hired me to do the rebuild and I should complete the work". That kind of integrity is rare nowadays, but I digress. My trans mechanic pulled the pans and could find no evidence of chips or fuzz. He proceeded to pull the tranny and go through it to ensure no contamination existed. He then pulled the Compounder out and apart and it looked like new. He mic'd out all the components and checked for warpage but the compounder was perfect. He had another rebuild kit in his shop and he rebuilt the compounder for a second time, just to be sure. He put it back together and replaced the TRS while re-assemling it, to fix the boxes around the trans position indication on the instrument cluster. (the indication problem started after the transmission rebuild, so my trans mech said he would replace that part antway as he did not catch that problem when he test drove it after the rebuild) When he went to test drive the van, the boxes around the indicators were still there. A little frustrated he went back through what he did on the original rebuild and he noted that he had replaced the solendoid body as a possible cause for the transmission codes(P0734 & P0792) I had been getting. Since all the signals from the TRS go throught the solenoid body connector he put a new solenoid body on my transmission and this fixed the indication issue. he then test drove the van and the P0734 & P0792 codes did not reappear. He drove the van for 10-15 mile with no problems (these codes would set within 5 miles everytime before). I picked the van up on Christmas Eve and it has been working great for the last week. So it looks like the P0734 & P0792 codes were corrected by the replacement of the TRS. As unlikely as that sounds, it is the only part, that was changed, which caused a change in the trouble codes.
If the TRS was the problem then I wonder how many remanufactured transmission were replaced for this simular issue, as a remanufactured unit would have a new TRS installed?
$4000.00 fix for a $30.00 part?
I am just happy that my T&C is back on the road and I will update should this problem rear it's ugly head again
Kwinters: something to look at, I believe you could change this at home and the part is inexpensive so no harm no foul if it doen't help

I too want to thank you. I love my T&C and this exact issue, ALL of it was bearing down on me. I will post if this fixes my issue as well.

 

[wrench91]

UPDATE: I took my T&C back to the dealer (after the transmission rebuild) to have them solve this mystery problem. They had it for 1.5 weeks and could find nothing but the wires I had bypassed during my troubleshooting. I had them rewire the sensors and they then suspected the TRS(Transmission Range Sensor) switch because of the instrument cluster indication. They asked me if the Compounder was replaced during the rebuild and I informed them that it was rebuilt but not replaced. They then pull the side cover off to look at the TRS and wiring. When the pulled the cover they said that they found chips in the pan and that it looked to be coming from the Compounder. They siad the the wiring looked ok and gave me an estimate for a Compounder inspection. I called my transmission mechanic(He rebuilt this trans) and he suggested that I bring it back to him because, "you hired me to do the rebuild and I should complete the work". That kind of integrity is rare nowadays, but I digress. My trans mechanic pulled the pans and could find no evidence of chips or fuzz. He proceeded to pull the tranny and go through it to ensure no contamination existed. He then pulled the Compounder out and apart and it looked like new. He mic'd out all the components and checked for warpage but the compounder was perfect. He had another rebuild kit in his shop and he rebuilt the compounder for a second time, just to be sure. He put it back together and replaced the TRS while re-assemling it, to fix the boxes around the trans position indication on the instrument cluster. (the indication problem started after the transmission rebuild, so my trans mech said he would replace that part antway as he did not catch that problem when he test drove it after the rebuild) When he went to test drive the van, the boxes around the indicators were still there. A little frustrated he went back through what he did on the original rebuild and he noted that he had replaced the solendoid body as a possible cause for the transmission codes(P0734 & P0792) I had been getting. Since all the signals from the TRS go throught the solenoid body connector he put a new solenoid body on my transmission and this fixed the indication issue. he then test drove the van and the P0734 & P0792 codes did not reappear. He drove the van for 10-15 mile with no problems (these codes would set within 5 miles everytime before). I picked the van up on Christmas Eve and it has been working great for the last week. So it looks like the P0734 & P0792 codes were corrected by the replacement of the TRS. As unlikely as that sounds, it is the only part, that was changed, which caused a change in the trouble codes.
If the TRS was the problem then I wonder how many remanufactured transmission were replaced for this simular issue, as a remanufactured unit would have a new TRS installed?
$4000.00 fix for a $30.00 part?
I am just happy that my T&C is back on the road and I will update should this problem rear it's ugly head again
Kwinters: something to look at, I believe you could change this at home and the part is inexpensive so no harm no foul if it doen't help

I am trying to repair these same two codes at present. I would bet this will fix mine also.