20 Most Recent 1999 Chevrolet Silverado 1500 Questions & Answers


With you. Looks like you have changed everything. Driving a '95 Odyssey - Love it. Has a Real transmission, and all the goodies I grew up with. Parts that make sense. So - what does Autozone say? About it's computers? Mine has only one, and it is ...lame. Is it throwing any 'codes'? Hubby is the expert. Hope to send this to him. JW

1999 Chevrolet... | Answered on Sep 17, 2017


check to see if you can hear a loud sucking sound (air) going into the throttle body when the engine starts then dies. if you hear alot of air being sucked into the throttle body, replace the Coolant Temperature sensor located close to the thermostat housing on top of the intake manifold. If this $12.00 part goes bad, it will cause the same symptom you have described. You can check the sensor for correct reading by using a scan-tool.

1999 Chevrolet... | Answered on Aug 27, 2017


Motor is not turning in second direction to lower window. Either the new motor is defective or the device that reverses the electricity to the motor is defective. Regulator?

Take motor out and feed it juice - will turn. Reverse polarity and it should turn in other direction.

1999 Chevrolet... | Answered on Aug 27, 2017


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

1999 Chevrolet... | Answered on Aug 27, 2017


If the air stops blowing from the vents, the problem is with the blower motor. If it doesn't come on, try slapping the motor with your hand. If it starts when slapped, replace the motor.

Do It Yourself Diagnosis and Repair

1999 Chevrolet... | Answered on Aug 14, 2017


Finding a wiring diagram for the shift solenoid in question and testing for control (turn on signal ) from the PCM And checking to see if the solenoid is open is the proper way to find the problem . Not guessing and just replacing parts ! Check engine light on ? The PCM would set a code an turn on the Check engine light if a solenoid was open or if the circuit was open , shorted etc..... How many miles on the trans ? More then likely the reverse clutch has a problem .Before you start replacing parts you don't need take to a qualified repair shop and have it diagnosed . Hooking up a scan tool to check for codes an view data or inputs from the trans range sensor switch and outputs from the computer to shift solenoids . This would save you time and money

1999 Chevrolet... | Answered on Aug 12, 2017


Sounds like the chock needs a little TLC.

1999 Chevrolet... | Answered on Aug 02, 2017


besides the heated oxygen sensors being faulty, lean mixture codes also refer to intake/exhaust leaks ( cracked flex section of exhaust pipe at manifold , low fuel pressures /pump, faulty injectors , MAF/VAF,wiring and ECM

1999 Chevrolet... | Answered on Jul 27, 2017


could be a bad sensor, fuel pressure regulator also recommend checkin fuel pressure for fuel pump and fuel filter

1999 Chevrolet... | Answered on Jun 17, 2017


Does the code reader power up ? Does a message no communication show on the screen ? Is there B+ voltage at pin 16 in the DLC ? If all that is good try a auto parts store ,they check codes for free .

1999 Chevrolet... | Answered on Jun 10, 2017


you will have to rebuild or replace the transmission if continued to use in damage condition will either destroy transmission or can cause and accident

1999 Chevrolet... | Answered on May 30, 2017

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