Part time light on when in 2 wheel drive off when in 4 wheel driv

The vast majority of vehicles that have 2 wheel and 4 wheel drive will only light up something on the dash when in 4 wheel drive.(They also light up 4 wheel drive low if you have it) I've been driving 4 wheel drives for 25 years and have yet to see one that lights up something for 2 wheel drive.

Call the dealer.

have the actuator (mounted on the drivers side transfer case) checked. that is what makes the selection from 2-4 hi-4 low. it takes the place of a gear shift. they are a fairly inexpensive and easy repair (if thats the problem). i would start there providing you have checked the fuses and relays. i hope this helps.

I was researching the recalls for the 2002 tundra and havent found any recall pertaining to the 4whl drive. Sometimes when people have their 4wheel drive locked in and drive on pavement for any length of time, whether it be just a couple of feet or a couple of miles, over time it creates a binding of the gears in your transfer case. Once the bind is so great, the engaging and disengaging starts malfunctioning and leads to bigger problems overall. I could be wrong about this being the problem that you have but I think its something to look into. It wouldnt hurt to put your vehicle up off all fours and release the bind if any by running through the gears while in 2 and rour wheel drive while all four tires can move freely and release. See if that works for you. Check your gear oil front , center and rear and use much caution when attempting this suggestion. Also refer to your owners manual troubleshooting section for other possibilities. Merry Christmas. By the way, the electrical switch should be covered in the troubleshooting section also.

some time if you drive in reverse a couple feetit will go off if your sure you have it back in 2 wheel drive or if your is like mine it will be off next time you drive it

if light has come on truck advising its having trouble or is about to but check fluid levels, wires and connections if good have truck scanned for trouble code sum auto stores such as auto zone and advanced auto do for free code gives place to start

Do you have the push button selector switches or the handle on the floor?

Try putting truck in Neutral and let it roll slowly a few feet at an idle.

the next time you shift into 4 wheel drive, try backing up alittle bit and see if it shifts in and light comes on. i have a 1995 half ton chevy pickup and thats what i have to do do to get it to lock in.

sounds like the encoder on the side of the trans on the drivers side