4hi blinking

My 2008 toyota tundra 4hi starting to blinking and I just use it a week before and I had no problem switch to 2wd to 4hi or 4lo does anyone have a fix for this thank you

 

Did you put it into 4WD and switch back to 2? Does the lamp go out? Turn on/off? Does it just stay on no matter what? Could be a lot of things. ABS sensor?

 

When I switch back to 2wd the 4hi disappear for few then come back on

 

Get the codes pulled (see if there are any faults)

 

A friend connect one there was no code but I will try it again tomorrow and will post it here

 

Likely a faulty front differential actuator or maybe just the sensor for that actuator.

 

So I got a code c1241 low or high power supply voltage so I did a Alternator and battery tester and the regulator is damaged

 

So I change the alternator and the problem still to be the same

 

I think I need to do a diagnostic to see what the problem

 

Thats just an interwebz best guess for only having the 4wd light blinking, which means its not fully engaging.

 

Yes it's not fully in engaging it been like this for a week