2008 Explorer - P0770 Code

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Dec 16, 2015 | 08:37 AM

naiku

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Mountain Pass

Joined: Jul 2005

Posts: 177

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2008 Explorer - P0770 Code

Last night while driving, my transmission made a pretty severe clunk, but then appeared to act normal. However, a check engine light came on so I pulled over immediately as thankfully I was literally at the entrance to a gas station.

I looked under the vehicle, under the hood, saw nothing leaking, nothing obviously broken etc. So got back in and started the engine, went to shift into reverse and the transmission clunks, same going from N into D.

I limped it home, but while driving noticed that it was not shifting but stuck in one gear.

This morning I scanned for codes and the only one showing is P0770 Shift Solenoid. I searched this forum though and get 0 results on that code, searching Google is also surprisingly vague. I believe (could be wrong though) that I have the 6R60 Transmission, it is a 2008 Explorer with the 4.6L V8.

Any suggestions on where to check first? When I get time I am going to check the fluid level, but could not last night as there is no dipstick!

Thanks.

Dec 18, 2015 | 06:30 PM

redfury

Senior User

Joined: Apr 2009

Posts: 118

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From: Isanti, MN

A quick search points me into the direction of having a bad shift solenoid. Should be accessible by pulling the pan off the transmission . I'm not familiar enough with Ford transmissions to say with certainty though, and I don't have a shop manual for any Ford yet ( I normally own GM's ) . However, it seems likely that you have a faulty solenoid that is delaying engagement and causing hydraulic pressure to leak past it improperly ( sounds like it is sticking and causing too high of pressure which causes the clunk ( harsh engagement ).

Dec 20, 2015 | 05:34 PM

naiku

Thread Starter

Mountain Pass

Joined: Jul 2005

Posts: 177

Likes: 1

Quote:

Originally Posted by redfury

A quick search points me into the direction of having a bad shift solenoid.

That's about all I was able to find, debating whether to get a full rebuild or just replace the mechachronic unit with all the solenoids.

Dec 21, 2015 | 10:48 PM

redfury

Senior User

Joined: Apr 2009

Posts: 118

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From: Isanti, MN

I'm not familiar with the tranny you've got in your truck, but I was watching a bunch of 5r55w (S,N ) transmission videos ( hiriam guterez does full tear downs with great explanation ) and another guy and they pulled the plugs off the solenoid pack and cleaned up the solenoids with a twist bit of the proper size and checked operation. Apparently something sticks in the solenoids and causes the problem. Cheap way to fix it, if you don't consider the potential loss of transmission fluid and the cost of new fluid ( plus your time ). I'd certainly give it a shot before I jumped on a tear down/rebuild or even a new pack. Worst part of the whole process would be dealing with the transmission fluid.