light goes off, but comes back on at random times
trouble light for 4-wheel drive comes on on 2001 Chevrolet Suburban 2500
I am not very familiar with Chevy but with most cars with On Board Diagnostics Level 2 (OBD2)that is vehicles post 1996 a scan tool is required to retrieve codes stored in the computer of your vehicle through the 16 pin diagnostic socket under the dash. The fact that the light flashes shows there is a potential problem but looking at a manual I didn't see a way to retrieve codes without a scan tool.
We've had to service the front differential solenoid in the GM lineup. Not too expensive. Can you switch to 4WD or Auto without a problem?