We have several 5th generation vans, both are at roughly 170K miles. Had some shudder issues, so changed the trans fluid recently on one and sure enough, two weeks later we have problems. The fluid was dark, not much odor or signs of burnt plates, and only normal metal debris on the magnet. The transmission that had been working great, except some minor shudder, started to shift hard and then went into limp mode! P0755, the 2-4 solenoid is not right. Did some research, the typical new transmission filter is only good down to 120 microns, however the solenoids have only 40 microns clearance. The new fluid apparently freed up some debris in the transmission, as it never had this issue till the fluid change, and the new filter didn't save us from a solenoid getting stuck. Installed a Magnafine inline filter when this solenoid started to hang up, but too late to save it from getting/being stuck. Ohh the new fluid did help reduce the transmission shudder, and the transmission was essentially totally free of shudder after I also added Lube Guard Shudder Fix. Should have installed the in line filter before doing the fluid change, it may have saved all this issue. The solenoids still all test / Ohm wise as good. That's why I am pretty sure the 2-4 "B" solenoid is stuck open and not closing well if at all.
So, now I have ordered a "donor" Solenoid pack, and will leave the existing pack in place and just remove the packs top and then blow out the valve body ports while replacing the solenoid(s), will clean all of the solenoids, and test them out then too, as I am not up to replacing the whole assembly. It is also possible the pressure switch is just stuck and the solenoid is fine. Also added a can of Sea Foam Trans Tune to see if it would help free up the solenoid or switch, after a experienced transmission guy said to try it first. So far it has not helped. Driving the van around close to home as it is still stuck in limp mode, did manage to get transmission to reset out of limp mode for short times, shifting fine, then it returns to limp mode. So next week I will do the solenoid change out and related clean up and see if it works. I will also test the voltage and amp draw on all of the solenoids before I do this procedure, to help verify that the solenoid is indeed stuck. If it is stuck, it may very well, typically to most solenoids, draw excess amps when it doesn't operate vs one that is working. Will also clean the solenoid that's apparently stuck, to see if it frees up. Looked and looked for that amp draw information for these solenoids, and could not find it anywhere. Will make a report of what I learn after I am done.
Talked with several transmission shops on this, They quoted long waits for getting it in and crazy money to just replace the solenoid pack, Thats why I'm doing this in my "spare time" LOL
So, now I have ordered a "donor" Solenoid pack, and will leave the existing pack in place and just remove the packs top and then blow out the valve body ports while replacing the solenoid(s), will clean all of the solenoids, and test them out then too, as I am not up to replacing the whole assembly. It is also possible the pressure switch is just stuck and the solenoid is fine. Also added a can of Sea Foam Trans Tune to see if it would help free up the solenoid or switch, after a experienced transmission guy said to try it first. So far it has not helped. Driving the van around close to home as it is still stuck in limp mode, did manage to get transmission to reset out of limp mode for short times, shifting fine, then it returns to limp mode. So next week I will do the solenoid change out and related clean up and see if it works. I will also test the voltage and amp draw on all of the solenoids before I do this procedure, to help verify that the solenoid is indeed stuck. If it is stuck, it may very well, typically to most solenoids, draw excess amps when it doesn't operate vs one that is working. Will also clean the solenoid that's apparently stuck, to see if it frees up. Looked and looked for that amp draw information for these solenoids, and could not find it anywhere. Will make a report of what I learn after I am done.
Talked with several transmission shops on this, They quoted long waits for getting it in and crazy money to just replace the solenoid pack, Thats why I'm doing this in my "spare time" LOL
