My 2001 Chevy S-10 4 wheel drive truck is changing from 2 to 4 wheel drive on it's own. How do I fix it?

Question

This pickup has push button control for swithcing between 2 & 4 wheel drive. It won't stay in the drive I select and starts flashing & shifting all on it's own into 4 wheel low. This happens idling and driving. Can someone tell me how to repair this problem and give me directions?

Answer 1

The vacuum actuator is located under the battery tray. Start there (unhook it until you figure out the problem). Check the electrical connections at the transfer case and the switch. Might be a malfunctioning relay.

Answer 2

it sounds like theres an electrical problem there , first you should try to trace the wires from your switch , check it too , you may have a rubbed thru spot thats causing a short or a ground thats causing the unit to keep going in and out , OR its just haunted , lol! Good luck and good motoring .

Answer 3

try replacing the push button control they are not that expensive i seen them at a napa parts store in my town  take your fuse out that works the 4 wd  till u can get it fixed

Answer 4

The fuse for the Encoder Motor is under the hood labeled "TREC" and is 30 amps. You could also unplug the motor at the tranfer case.



i used to have the same problem with a 99 Silverado ado until it was totaled ted you can just hit the dash board if it is push button and it will go back to,