There are lots of reasons this could be happening. First I would check that the engine is working properly. If the power output is low then the gears will not up. Has the vehicle been regularly serviced? Auto boxes can be severly affected by old / contaminated fluid. Some boxes have electrical solonoids that select the gears these can stop working or bad connections to them. I would check the connections and try replacing the transmition oil before seeking professional help for a possible transmition rebuild.
Have you over heated it if so gear box needs work if not have you checked oil and not under or over filled i say you have burnt out valves less than you think gearbox expert only
SOURCE: 96 toyota tacoma 4x4
If you have auto locking hubs then you need to see if you are getting good vacuum to the front axel and check for a blown fuse or bad accuater
SOURCE: 1994 Volvo 850 2.4L Auto transmission
Clear your engine and transmission codes, its a small box in the pass side engine compartment right behind the headlight. Search "Bay 13 Volvo" and that has all the information to check and clear the codes. It also has a list of what the codes mean to help you.
SOURCE: 1993 Chevy 1500 pickup 4-wheel drive
I replaced the malfunctioning “thermal actuator” with the “Warn” Vacuum actuator setup, it’s been working great for about 7 years now, simple install, if I remember correctly, it was about $150.
That’s what engages the front diff into 4wd.
SOURCE: Headlights go out while driving
You need to check the headlight relay to see if it is still good. Parts store can tell you where it should be and what the part number is when you find it. A good shop will be able to test it. I have found that Volvo likes to play hide the relay under the dash so it's hard to say for sure where it will be.
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