Unexpected tranny failure

[Dieseljunkie]

well as the title says, today was no expected. So back in late July I got my tranny hot flushed at the dealership. thought all was well. Well yesterday I thought I would check my tranny fluid (haven't checked it since BEFORE the flush and refill) and it was very very low for being warm. at the bottom of the cold hash mark. I added about a half a quart. Drove around a bit checked it and added some more then parked it. Well after work today I checked it again while it was cold and running and it was mid about 3/8 on the cold hash mark. so I added some more and went to drive it to warm the tranny up. Well about 10-15 miles later I turned off the highway to go on a farm to market road and was easing up a little incline and all of the sudden it was like I put the tranny in neutral. Rpms went up is what alarmed me. So i was coasting along so I put it in N and back into drive then still nothing. (I was not romping on it or anything. Driving like a grandpa) Well I called my buddy to come pick me up on with his car hauler. It would move just barely in 4Lo. So we tried to load it up in Drive and it wouldn't pull itself up. It went into limp mode while trying to do so, or tow/haul flashing and idle went up, no response from throttle when in gear. I killed it, let it rest, and fired it back up. Still elevated idle. backed it off the trailer and we got it to load up in reverse. I was having to rev it up to 3500-3800ish rpms to get it to move up on the trailer. not constant though. Kind of like I was just revving it up. So we got back home and I remembered to check codes. It threw 6 soft codes:

P0715. Turbine/input shaft speed sensor A circuit
P0717. Turbine/input shaft speed sensor A circuit no signal
P0720. Output shaft speed sensor circuit
P0722. Output shaft speed sensor circuit no signal
P0791. Intermediate shaft speed sensor A circuit
P0793. Intermediate shaft speed sensor A circuit no signal

I also pulled up the torque converter rpms when the tranny first went out and it was still the same as idle in park and when I revved it up in park. Well when I got home it was around 380ish rpms. much lower than idle and would not go up when engine was revved. It lowered rpms.


It's never leaked a drop and has never gotten over 205* and that was towing very heavy with with rpms up. Runs around 160-170 while unloaded highway speeds. Never slipped enough to cause worry. just very very very little sometimes. And has a little case of 3-5 flare sometimes. So what in the world has happened here? Anyone know?

 

[Dieseljunkie]

And also after I wrote the codes down I cleared them and the truck went back to normal idle and no codes came back up when the truck was killed and restarted.

 

[swinky]

All the codes are for electrical side of things. I'd say it's ***ked though since you held it at 3500 while it was creeping onto a trailer.

 

[Zmann]

how many miles ? just curious not related

and you buddy needs a winch on a car hauler or you needed a flatbed

I wouldn't have done that to mine

hopefully it's just electrical but I have no clue
good luck !

 

[Dieseljunkie]

And I just discovered that I apparently added the wrong fluid:fustrate: I put in mercon V, only about a quart total though.

 

[Dieseljunkie]

Funny thing is he was getting a winch for it this weekend, and it is a flatbed. Truck has almost 126k

 

[Zmann]

well crap

i don't think 1/2 qt of v would be instant death

 

[Dieseljunkie]

That's what Im saying. I didn't realize it took sp or lv. Totally slipped my mind to look. I had some V in the garage and was in a bind at the time so that' what I used.

 

[1fastTRX]

One quart of V won't cause it. I had a shop do a drain and fill on my trans, but they filled it with V. I drove it like that for over 10k (I had completely forgotten). I'm back on LV now. Doesnt help your case but just thought I'd throw it out there.

Sent from my SCH-I535 using Tapatalk

 

[Dieseljunkie]

One quart of V won't cause it. I had a shop do a drain and fill on my trans, but they filled it with V. I drove it like that for over 10k (I had completely forgotten). I'm back on LV now. Doesnt help your case but just thought I'd throw it out there.

Sent from my SCH-I535 using Tapatalk

It sure eases my mind some though. Thanks for the confirmation!

 

[09stroker]

My 03 back in the day did something similar except when you would rev it up in drive it would have an extreme load to move. You could hear it in the sound of the motor and high EGTs. It ended up being a broken low/reverse hub according to ford.

 

[Dieseljunkie]

Hmm. Mine is kind of the opposite. Almost as if its in neutral when in gear. Only moves in 4lo though when revved up. Could it be the TC?

 

[09stroker]

You should check the pressure it's making in P R & D

 

[Dieseljunkie]

You should check the pressure it's making in P R & D

Do you know if a dashdaq can do that?

 

[lariat06]

Same exact thing happened to me in my 06. Dont have the paperwork in front of me but i believe they said it had something to do with the clutches in the transmission. Ended up having the transmission replaced. Have not had any other issues.

 

[Mark Kovalsky]

Do you know if a dashdaq can do that?

The ONLY way to do it is to get a 0-350PSI gauge and install it in the test port on the driver's side of the transmission. You can't get this information from the computer, it doesn't know what the pressure is.