Transmission issue no first or overdrive and codes P0700 and P0750

04GC07COMMANDER

MEMBER
2004 JEEP GRAND CHEROKEE
4.7L
V8
4WD
AUTOMATIC
121,000 MILES

Recently on a trip to PA about halfway there on interstate we heard/felt a clunk and noticed the rpm were higher and it was in third gear. We pulled over immediately to check it out. Upon stopping we noticed it was in third trying to pull out also so I pulled it to first manually but all it will do is second. So we limped it home after stopping by advance for code scan. It has P0700 on dash code and adds P0750 on code scanner. I replaced the shift solenoid pack last night along with fluid filters and gaskets then reset the EC and TCM but it still is in limp mode. The only codes showing are the same ones P0700 and P0750. Anyone have any ideas what else may be the culprit?

5 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good morning,

The 700 code is a general code. No worries

The 750 is for the low/reverse solenoid either being stuck open or closed.

https://www.2carpros.com/articles/automatic-transmission-problems

I attached the flow chart for the code below along with the wiring diagram.

It could be valve body related or wiring harness related but needs to be verified.

https://www.2carpros.com/articles/how-to-check-wiring

How was the fluid when you have the pan down?

Roy

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Monday, May 4th, 2020 AT 5:22 AM

04GC07COMMANDER

MEMBER
3 POSTS

The truck had around 120,600 miles and had at least one previous fluid and filter change in the past. The fluid was not burnt or dirty. It was still in really good condition in my opinion. It did have a little bit of clutch material in the pan but not a lot or any large pieces. The magnet in the pan had some metal shavings on it as well but again not an excessive amount. Previous to the clunk and limp mode the transmission was smooth and flawless. It shifted smooth up and down through the gears and had never had any signs of slipping or sluggish shifts. This all came about instantly. I am wondering if the TCM or maybe if there's a relay other than one under hood in fuse box that could be bad? Also the governor pressure switch and input/output speed sensors if they could cause the issue? I am buying a 2002 Overland with the H.O. 4.7 this Saturday it has been rolled but runs and drives with no check engine lights. If I haven't gotten this figured out by then I am considering swapping the valve body solenoid pack any sensors and TCM into this one and see if that fixes it. If not I will swap in the whole unit but I don't think the transmission itself is the issue but then again who knows. Will the TCM from the 2002 work in the 2004 if I want to try that as a possibility?

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Monday, May 4th, 2020 AT 3:14 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

Okay, did you follow the flow charts I sent you? What were the results?

If you want to find the issue, testing needs to be done instead of guessing.

I would not change the valve body from the other unit. I would swing the entire transmission.

https://www.2carpros.com/articles/transmission-replacement-removal-manual

No to the TCM and no to the relay. You would have codes related to both if they were an issue.

Roy

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Monday, May 4th, 2020 AT 3:21 PM

04GC07COMMANDER

MEMBER
3 POSTS

I am going to check the wiring first thing tomorrow morning and check the readings I find and go from there. I had thought of taking the plug back off and inspecting the pins and make sure they haven't pushed out or maybe broken inside as well. I've read so many posts of people with the same codes they replaced solenoid pack and that was all it needed I don't know what the chance of having gotten a bad replacement pack would be it seems unlikely. I also have the 2006 Commander 4.7 I could technically use the pack/valve body from if my wiring checks out okay tomorrow if I need to. I wont have the Overland until Saturday for a donor transmission if all fails. I will ohm the wiring and send results. Thanks for the help.

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Monday, May 4th, 2020 AT 4:15 PM

ASEMASTER6371