2010 dc 4hi flashing vsc lit

2010 dc 150k miles.

put on 4hi at 30 mph or do. And the lights flashed. 4hi

truck was in 4hi. Felt like it anyway. But flashing 4hi

wouldn’t switch to 2wd still flashing 4hi

pulled over and restarted.



4hi is off now. In 2wd but the vsc skid is on solid.

got home. Restarted and all lights off.

what’s going on?

 

This might help to start: https://www.tundras.com/threads/4hi-flashing.116652/#post-3010300

 

thanks - it has returned to normal functionlity...will det the fluids changed and make sure it is smooth