2003 GM Truck 2500HD 4x4 Not Working

This 2003 Silverado 2500HD has no 4x4 operation.
Scanning results in no communication with the transfer case control module. Tested powers and grounds, cycled connections at the module and it started working again. Also has an ABS problem.

[@BrianKierstead-nt2og]

Thank you sir unplugging my transfer case controler and plugging it back in solved my problem also.

[@oldbiker9739]

Phillip with the magic touch .

[@billmck12345]

those k turcks are well known for rust buildup under the ft wheel speed sensors and lifting away from reluctor. gm has bulletins on this....gm also know for terminal fretting.....good vid

[@PhillipBailey]

Thanks for the tip. I'm aware of the speed sensor rust jacking situation. Fixed dozens. Most of the time the sensor won't come out to clean it as per the bulletin. Also if its not an OEM wheel bearing some speed sensors are different lengths too so I usually just recommend to replace the whole wheel bearing assembly.

[@johnpuentes1738]

Thanks a lot for sharing your knowledge. Have a nice day. God bless.

[@stevemazzarella7212]

Call that a hard reset that’s how my luck works too!!! 🤣

[@danilueloo]

Put in a brand new actuator and for wheel drive switch. All the fuses are great. plugged in the new switch and the lights all came on but it would not go into 4 real drive and none of the Lights came on after the first flashing. Still no 4 WD. Just 2 WD

[@mikehensley3486]

How could i get a copy of the schematics for the plugs at the tccm that you used?

[@PhillipBailey]

Try Alldatadiy.com. it's very reasonable in my opinion

[@phonypony5.0]

How much voltage is the tccm suppose to see ?

[@PhillipBailey]

Should have full voltage from that 30 amp fuse. Unless you mean on the serial data circuit in which case you need a lab scope to see the approximate 7volt square wave.

[@kennyslaughenhaupt3839]

Wow okay I have the same problem I was told it's either the 30 amp on the dash the 30 amp in the firewall the actuator motor or the switch I'll tell you another thing you won't be tearing my truck apart like that to fix it and if you do get better look like nothing ever happened holy cow