I have a 99 Chevy Silverado and the 4x4 switch panel has no light on even in 2wd. I replaced the switch panel and no luck. I know the front CV shaft needs replaced and the back breaks do too. Can this cause the light to go out not allowing me to switch to 4x4? The service 4x4 message has came on a couple times before the light went out on the panel but now no message and no light?
Your brake an CV joint issue can't an won't cause your 4X4 problem . The 4x4 system has a control module which supply's B+ voltage to the switch . Checking for codes in the 4X4 control module should have been the first step . Your best bet , take it to a qualified repair shop . You don't have the knowledge or test equipment to fix this.
SERVICE indicator (4WD/AWD) Lamp
The SERVICE indicator (4WD/AWD) lamp is an integral part of the cluster and cannot be serviced separately. This lamp is used to inform the driver of the vehicle of malfunctions within the automatic transfer case (ATC) system. The SERVICE indicator (4WD/AWD) lamp is controlled by the transfer case shift control module via CKT 1567.
Transfer Case Shift Control Module
The transfer case shift control module uses the VIN information for calculations that are required for the different calibrations used based on axle ratio, transmission, tire size, and engine. The system does not know which calibration to use without this information.
The direct battery supply line (CKT 1640) provides the power to the module and motor circuitry.
Transfer Case Encoder Motor
The transfer case encoder motor consists of a permanent magnet (PM) DC motor and gear reduction assembly. It is located on the left hand side (drivers side) of the transfer case. When activated it turns the sector shaft of the transfer case (clockwise or counter clockwise) to shift the transfer case. The encoder motor is controlled with a pulse width modulated (PWM) circuit within the transfer case shift control module. This circuit consists of a driver on both the Motor A and Motor B circuits. The encoder motor is bi-directional to allow the motor to shift the transfer case from 2HI or 4HI to NEUTRAL and 4LO positions.
Do you know what DTC'S are ?
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 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
SOURCE: 4x4 selector-shaft box suddenly rattling/make noise in 2H
Selector shaft mounting is coming loose,,take the top rubber boot off and inspect,,if you can see the screws or bolts,,give them a little tighten.
SOURCE: 1999 Chevy Silverado 4x4, transfercase will not kick out of 4x4
sounds like the punch solinoid in the front diff
SOURCE: Front-left Outer CV Shaft Disconnected from inner-CV shaft
If memory serves me right the axel is bolted to a plate on the front differenchel and a large nut on the end that goes thru the hub bearing, if you take the whole shaft out( both ends) i see no problem running it temporary without it.
SOURCE: I HAVE A 99 CHEVY
Hello and welcome to FixYa!
Yes indeed. You can remove the drive shaft and axles and replace the hub assemblies to make it a 4x2.
Hope this helps and thank you for using FixYa! Have a good one!
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