front end not locking in 4x4 2002 2500HD chevrolet Silverado

Scan the PCM/TCM for code/s-possibilities here could be the transfer case shift control module,transfer encoder motor and the transfer case encoder-also see transfer case diagnostic system check below

Ok, I have a Code Buddy CAN OBDII Code Reader 901ES (I know it's cheap). When plugged inthe tool doesn't comunicate w/ the CAT, HCM, EVAP,2AIR or theA/C. Why? This Vehicle has been involved in an odometer rollback scam so I know the computer has been tampered with. However I don't know if the lack of comunication is due to the tampering or my cheap code reader. The Vehicle has been into 2 dealerships since I've owned it & neither one caught the odometer tampering. It VIN# will help it is 1GCHK29U02E231162

If its unable to communicate your scantool might not be compatible. I recommend you bring it back to the dealer I don't think I can be helpful, I'm sorry

Thank you for your input & time. On way to use a better reader now at auto parts store. This site has/is very helpful

I'm sorry again and TY for using 2carpros

C0226 ABS Left front speed sensor missing. Would this cause problem. O'Reilley's/Shucks Auto parts store has a fee of $10 to access some parts of their loaner Code Reader. Does anyone know what it accesses for the 10 bucks? My Vehicle has to cycle before I can go any further lol.

Dunno if its related but the ABS light should be On if there's a failure on the ABS-if missing it has to be replaced

$10.00 bucks to probably acess the ABS module I assumed