So I just had my 2 week old Taco malfunction while off road. I was stuck in some soft deep snow, and 4Hi wasn't getting me out so I switched into 4Lo and got out. Then, no matter what I did I could not get it to switch back into 4Hi which was a problem because I was 60km's away from home via highway. I didn't even have a wrench with me that I could remove the battery cable (that wont happen again) so I was a bit screwed. Then, I remembered reading a thread here last week from someone informing people how to turn off the maintenance required light. I did that reset, turned the truck off again, switched to 2Hi and sure enough, everything was back to normal. Thanks Tacoma World!
Anyone else ever have this problem? I can only find one other thread on it. The only thing Im afraid of now is that the ECU reset would have also erased any trouble codes, and Toyota will have no way of finding out what happened.