Get your ride checked for error code and know the exact
cause of problem i.e. either faulty Transmission Control Module (TCM) or Low
reading for clutch pack. Also it may be possible that the fourth gear's teeth
may have been damaged. Let a professional inspect the ride and know where the
a 6ya Repairman can help you resolve that issue over the phone in a minute or two.
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This is common to the AW70 transmission when the rear bushing has been left very worn for a period of time. The rear shaft wear heavily on the main transmission housing causing the pressure not to build enough to engage the overdrive gear.
The most common problem that these cars have is the wire to the solenoid. The insulation will come off of the wire and it will touch the rear of the transmission. It is a bit of a pain to get to the wire to repair it if you don't have a lift.
The overdrive solenoid is connected to the transmission itself on this Volvo. You will find the switch on the passenger side of the transmission. It looks like this
As a means of testing operation of the solenoid - you can ground out this switch by turning the key in the ignition into the on position. Make sure engine is off and the transmission in 4th gear and listen for the click of the soleniod on the back of the overdrive. Also the light on the dash should iluminate as well.
Hope this helps. Please remember to rate my answer. Many Thanks.
Overdrive relay usually fixes the problem. With the engine idling quietly, press the OD switch on the shift lever. Do you hear a click? If not, it is probably the relay. Located behind the glove box, passenger side. toward the center console. Pick up a used one on Ebay ( about $10 bucks) and swap it out. Cured my problem right away. Be sure you change the correct relay because Volvo hides several back there. I would buy the spare, then match it with the one now installed.
If not the relay, you will need a new solenoid in the transmission. About $200 installed.
You have an overdrive relay issue. The tansmission is really a four-speed box, but the OD selector either locks our fourth gear or allows the car to shift normally into fourth. I use the OD on my volvo all the time, because the revs drop in half when the OD is activated, The relay is located behind the glove box, toward the center console. $10 buck on Ebay and your transmission should shift correctly again. I would try that BEFORE more expensive fixes, like OD solenoid $200 or transmission control module. Just for kicks a picked up a spare ECU on Ebay for $10 because these get costly if and when they go. Easy fix, though, a couple of plugs.