4x4 light flashing

[turi]

when I try to engage 4hi the light flashes but 4x4 is engage. any suggestions on what is the problem?

[wylcat]

sounds like an ADD actuation problem... it might be partialy engaged or even fully engaged, but the position sensor says that it isn't. first I would get under there and make sure the wire connections are clean and tight. also check for any cuts or breaks in the wires.

[wylcat]

here's a couple older threads dealing with the early model tundras front ADD

$800.00 to fix 4wd ADD not covered by warranty

2000 ADD Actuator - "Issue" - Could use some help?

[imjin]

When you hit 4-hi, try to rock the truck back and forth by putting it into forward & reverse. Sometimes that helps to get it into gear. When it finally connects, you may hear a faint clunk that'll tell you it's locked into position. Usually I only have to do this when I'm parked on a hill and try to engage 4-lo or hi.