Shifting problem with Volvo

If its the early I-shift that Volvo used it could be several things.
The I-shift is a fully electronic controlled Meritor 10-speed
Since it shifts thru the first 5 gears.
The most common problem would be the high/low range solenoid.
This is mounted on the top of the trans right behind the shift control unit.
First suggestion before removing that solenoid. Go to a parts store and get a can
of electronic contact cleaner and some dielectric grease. Clean all of the harness
plugs on the transmission ECM, the shift control unit, the high/low range solenoid
and the clutch solenoid.


If its the early Ultrashift then it gets a bit easier.
The Ultrashift is partially electronic controlled Eaton/Fuller.
The most common problem would be the high/low range splitter. Which is partially
air controlled, partially electric controlled.
The high/low range splitter is mounted at the rear of the trans above and to the
right of the tail-shaft. There is a air metering solenoid in this system to control
the air flow to the high/low range splitter.
First check the system for an air leak. If no air leak then, go to a parts store and
get a can of electronic contact cleaner and some dielectric grease. Clean all of the
harness plugs on the transmission ECM, the shift control unit, the air metering solenoid
and the clutch solenoid.


If none of the above works then you may be looking at replacing the transmission ECM
or the shift control unit.


Hope the above info helps.

 

sounds like worn X-Y motors. but in 2003 Volvo used Eaton Autoshift, ZF-Astronic/Freedom, Volvo Geartronic, Alisson, Volvo Powertronic and early I-shift (with external clutch servo, like on ZF, made by Knorr).

So first of all identify tranny, clear all codes with dashboard computer, do test ride and read codes and post code list.

 

This may sound like a bunch of hot air, but it's not. I remember years ago when I was in the Navy, I was an electronics tech. It was really surprising to me just how many times unplugging a component, cleaning the contacts and plugging it in again worked. They even had a job code for "re-seating" the plugs.
I also remember last year when the auto on my 2007 780 wouldn't work. I unplugged the wire to the control box, cleaned the plug and it's worked fine since then.
I suggest doing what he said. You just may save a bunch of money.

 

You are Pablo.
I didn't mention the ZF-Astronic/Freedom, Volvo Geartronic, Alisson and Volvo Powertronic
transmissions.

 

Can't get high side gears to pull. Would get to high gears but once into gear stop pulling and go into a nuetral state.

 

i have 2003 volvo 780 with automatic trans i have the same problem you having it wont #### after the 5th gear. its at the volvo dealer right now i took there few times for the same problem they still cant find the problem. when the problem happens to me i gotta disconnect the battery and t he trans connectors by the drive shaft to temporarily fix it. it use to happen once every couple months but now it happens few times a day. please let me know if you get it fixed i will do the same. good luck and thank you.

 

if i were you i would check the wire coming from the inside of the cab to the battery most of these problems are from a cut and corroaded wire somewhere so go through it and check to make sure the wire or wires are in good shape