March 16, 201412 yr 1988 XT6 manual FT4WD transmission. DIFF LOCK is coming on while driving. The diff is actually locked and the light is on. The DIFF LOCK button works properly otherwise (meaning it'll turn off if the DIFF LOCK is off). Vacuum hose or solenoid/electrical?
March 17, 201412 yr Author Last night the DIFF lock would come on if i revved the car in neutral while coasting - happened a few times. So vacuum hose or the engine revving is tweaking wiring/solenoid i suppose.
March 17, 201412 yr The solenoid is mechanically weak or not sealing so you'll need to replace it. We used to see this all the time with EGR solenoids on Chevy's in the 90's. easy fix.
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