My Silverado is a z71 4x4 and as a common problem the 4x4 is not working. I have replaced motor on transfer case and the switch on the dash and yes the service 4x4 light is still on. I have also checked the ground and made sure it is good. it does work sometimes so I believe it has a bad connection somewhere. the lights on the switch flash when you turn on the ignition or start the truck. Also when it does work and you try to switch back and forth from 2hi to 4hi it will only do that a few times then quit. Can anyone help me with this?
Yes we can ! With the light on and or flashing , DTC'S - diagnostic trouble codes are stored in the 4X4 control module . Have the codes check , not at auto zone or any other parts stores . There code reader tool will not pull this codes . Need to take to a qualified repair shop . Testing also needs to done , not guessing an throwing parts at it . This 4X4 system can set a number of codes .
DTC B2725 ATC Mode Switch Circuit Malfunction
DTC C0300 Rear Speed Sensor Malfunction
DTC C0305 Front Speed Sensor Malfunction
DTC C0308 Motor A/B Circuit Low
DTC C0309 Motor A/B Circuit High
DTC C0310 Motor A/B Circuit Open
DTC C0315 Motor Ground Circuit Open
DTC C0323 T-Case Lock Circuit Low
DTC C0324 T-Case Lock Circuit High
DTC C0327 Encoder Circuit Malfunction
DTC C0362 4LO Discrete Output Circuit High
DTC C0367 Front Axle Control Circuit High
DTC C0374 General System Malfunction
DTC C0376 Front/Rear Shaft Speed Mismatch
DTC C0387 Unable to Perform Shift
DTC C0550 ECU Malfunction
DTC C0611 VIN Information Error
DTC C0387 Unable to Perform Shift
Circuit Description
The transfer case encoder is a switch that converts a shaft position, representing a mode or range position, into electrical signals for use by the transfer case shift control module. The encoder houses 4 Hall effect sensors that are used for channels P, A, B, and C. These sensors provide a path to ground, when a magnet, (part of the Motor Encoder), passes over them.
The transfer case shift control module supplies an 8 V reference and a ground circuit for the encoder hall effect sensors to function.
The transfer case shift control module supplies current limited 5 V on all the channels, thus as these channels are pulled to ground, the module can interpret the location of the transfer case shift position.
This DTC detects that the transfer case is unable to successfully complete a shift to a requested mode or range.
SOURCE: My 98 chevy blazer won't shift into 4wd.
Most common problem is the vacuum diaphragm that is so inconviently mounted UNDER the battery tray.The cable that locks in the front diff is attached to it and vacuum pulls it in/out.
SOURCE: s10 pickup 4wheel drive wont shift from 4hi to 2hi
Mine is on the front drivers side, is yours? I just about fell over when I discovered who they designed it!
SOURCE: 2001 s10 pickup transfer case wont go out of 4lo
Mine is acting up as well, a mechanic friend of mine said it was the four wheel drive actuator, and it was quite common he said
SOURCE: 95 Blazer 4X4 Problem
Ok I just got my 4x4 working again. I got it to work by taking out the 4wd, brake, and I believe the ctsy fuses for about one minute each and put them back in and now my 4x4 works like it used to. If that works for anyone else great, but if not then good luck finding a better solution to the 4x4 problem.
SOURCE: stuck in 4 wheel drive and wont come out.
hey there i cant tell you what you are missing but i can tell you how to disengage the front wheels . ok you have a vacum line that runs right under the battery and a line that comes up from the front diff. to the same place ( you may have to remove batt and batt tray to get full access to this) un bolt it and temporaly put batt and batt tray back in start it up and decompress this and see if it comes out .... you should here clunking noise if it goes back in ... if thats the case just pull that big vaccum line off .... to test get all four tires off the ground and have some one put it in drive but dont hit the gas it should turn on its own ...if that dont work check the cable that runs down to the differental
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