This is my little brothers truck. A 05 f250 that is drove hard. It has a p0756 p0761 p0766 p0771 and a p2701 p2702 p2703 and a p2704. Right now reverse does not work it just goes forward. In park it is trying to go forward. I disconnected the batteries after I got these codes to try and reset everything. He did have a parasitic draw on the batteries and had a bad connection on the batteries which may have had something to do with this. I find it hard to believe the 4 shift solenoids would go out at once. Where should I start?

Sent from my leash using IB AutoGroup

 

Crap, that's a lot of codes, I agree with the reboot and to try and run a full relearn and see what comes back. Make sure fluid is at the correct level hot and make sure it's reasonably clean, if it's older fluid a spill and fill is in order, just what you can get out from the drain plug. If you are brave, could pull the pan and check all connectors to see if you have a bad connection to the harness, and inside the pan. (Maybe our local tranny guy will chime in here on this strategy)

 

Update. The fluid is red but has a burnt smell. The ohmed out the shift selonoids from the pcm connector #3 pin 7 to 9 10 11 12 13 and they all had 4.5 ohms. These are the 5 shift selonoids according to the diagram I found. Anything else to check before removing the trans?

Sent from my leash using IB AutoGroup

 

Any one?

Sent from my leash using IB AutoGroup

 

I would look at the wiring harness for chafing myself before committing to replacing solenoids.

Josh

 

I will ohm them to ground on top of between the 2 wires. This should show a chaffing problem. I can't see 5 solenoids going bad at the same time. Or are they relying on one another like fuel pressure and injectors?

Sent from my leash using IB AutoGroup

 

They are all totally independent. You can get all of them to fail if the trans is generating a lot of fine particles.

 

I am hearing more to the story as the night goes on. The morning before getting stuck in only forward gears, the tc lockup kept cycling on and off and he had a code for tc slip and a speed sensor code. Can the solenoids be cleaned or freed? Maybe a dump and fill, new ex filter with an 08 full flow filter. If it is just solenoids it would not be out of reason to change the 5, but I would not want a repeat failure. I really do not want to drive it until I repair the solenoids but if something else is failing causing fine particles I don't want to damage new solenoids. I am wondering if the particles are being generated by the tc lockup slipping, but I do want get back to the root problem without risking a new set of solenoids if at all possible.

Sent from my leash using IB AutoGroup

 

I am not a transmission tech by any means (even though I possess the Ford specialty certification), but if I recall correctly, there was an ONP (04B24 I remember the number correctly) back sometime to address an issue with the reverse clutch drum snap rings "walking" out of the case grooves. The ONP seemed to cover late '04 model years, but I also seemed to remember seeing some early '05s coming in with this failure as well, but not being covered under the program. Again, I'm not a transmission tech but I'm just throwing ideas out there.

 

That problem started at Job #1 2005. No 2004 model trans had the stupid design snap ring. If the engineer that released that part for production had done his job correctly then my 2005 development trucks would have had that part and I would have had that failure in 2003 and 2004, and the part would have never made it to production. [/rant]

The 2004 models, and only that year, had a different problem. Manufacturing let a process get out of control. One of the pinion shafts in the planetary assembly didn't get staked properly. The shaft would gradually work it's way out where it contacted other rotating parts. It then machined it's way into the other part. That generated A LOT of metallic contaminants.

If the torque converter is slipping it will NOT generate the fine particles that will make the solenoids stick.

The pan should come off. See what the bottom of the pan looks like. If it is covered with metallic powder then the trans needs to come out and be torn down to see what's wrong.