Question about 1990 Volvo 740
My 4th gear lockout light is on and the switch won't turn it off (orange up arrow on ist. cluster.) I bypassed the switch to see if it failed and it has not and i also replaced the overdrive relay but still get the arrow-anything else i can try-I can't believe Volvo engineers built a system that fails to a worst case mode.
Sounds like your overdrive solenoid is dirty or broken. Take off the solenoid and clean it really well, put it back on and see if it works. If not you will have to replace it.
This happened to my fathers and I had to clean it.
Sometimes the tranny oil is so dirty that little bits of metal get stuck in the solenoid area and you have to scrape them off. You might want to do a tranny flush if it's bad.
Posted on Sep 17, 2008
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May 07, 2015 | 2001 Volvo V70
May 11, 2012 | 2000 Volvo S40
4th gear disengagement:
The 4th gear is engaged automatically after the transmission has shifted through 1st, 2nd and 3rd gears
at certain speeds and loads. By pressing in the button at the rear of the selector level, the 4th gear can be
disengaged, thus providing a three-speed transmission. As a reminder the
? light on the dashboard
glows. By pressing in the button again, the transmission reverts to four-speed operation and the
light shuts off.
This is straight out of the owner's handbook. What this indicates is that there may be a problem with the shift solenoid. On the highway, does is seem to rev high? Can you press the button on the shifter and have the light go out? let me know.
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