4 wheel drive on 02 chevy silverado not working

There are a few potential causes for the issue you are experiencing with your 2006 Chevy Silverado 1500 4x4 and the 4l60e transmission. Here are a few possibilities:

1. Clogged or dirty transmission filter: If the filter is clogged or dirty, it can cause problems with the transmission, including a loss of reverse gear.
2. Faulty solenoid: The solenoid is responsible for controlling the flow of transmission fluid, which in turn controls the shifting of the gears. If the solenoid is faulty, it can cause problems with shifting, including a loss of reverse gear.
3. Wiring issue: There may be a problem with the wiring that connects the transmission control module (TCM) to the solenoid.
4. Faulty TCM: The TCM is responsible for controlling the transmission, so if it is faulty, it can cause shifting problems.

To diagnose the issue, it is recommended to have a mechanic or dealership technician take a look at the car. They will have the necessary tools and expertise to properly diagnose and repair the problem

Can't be to sure with yours. It maybe the switch. On my 2002, I found I had a Transfer Case Control Module issue. Shopped around and found one on Amazon for half the price the local box stores wanted. I would Google this before starting to buy a bunch of parts.

1A Auto Shows you how to install, repair, fix, change or replace a broken or not working AC/Heater air temperature control. This video is applicable to the 99, 00, 01, 02, 03, 04, 05, and 06 Chevy Silverado, Sierra, and Suburban models.

this might be important for you to know
Quote:

08-08-49-002: False Triggering of Low Coolant Level Warning Message (Reprogram HVAC Control Module) - (Feb 13, 2008)

Subject:
False Triggering Of Low Coolant Level Warning Message (Reprogram HVAC Control Module)

Models:
2007-2008 Chevrolet Silverado 2500 and 3500 Heavy Duty Series Only
2007-2008 GMC Sierra 2500 and 3500 Heavy Duty Series Only
with 6.6L Diesel Engine (VIN 6 -- RPO LMM)

--------------------------------------------------------------------------------
Condition
Some customers may comment that a "COOLANT LEVEL LOW ADD COOLANT" message is displayed in the Driver Information Center (DIC) even though the coolant level is normal.

Cause
This condition may be caused by a false reading during off-road driving or in high slush conditions.

Correction
Do This - Reprogram the HVAC control module.
Don't Do This - Do not replace the coolant level sensor, HVAC control module or radiator surge tank.


A revised calibration has been developed to address this condition. Technicians are to reprogram the Heating Ventilation and Air Conditioning (HVAC) control module with the latest software available on TIS2WEB. Refer to the Service Programming System procedures in SI. As always make sure your Tech 2 is updated with the latest software version.


Warranty Information
For vehicles repaired under warranty, use:
Labor: Operation D4707
Description: HVAC Control Head Module or Assembly Reprogramming with SPS
Labor Time: Use Published Labor Operation Time

You need to have the dealer scan the control module to see what codes show in memory

the transfer case control module is located behind the left side of dash behind the headlight switch, you will need to remove the speedo trim around speedometer, then pull put the headlight switch. the module is just snaped into place. also keep in mind, the module has to programmed with software for it to work correclty. in other words, the replacement module will have to be programmed after installing

I do not know anywhere that can repair the module, and yes one from a salvage yard is a good idea.

You first have to disarm and remove the air bag (unscrews with bolts from behind the steering wheel) and then you will see the screws for the switches. Only the silverado awitches will work.

replace the transfer case shift control switch . there is a TSB # 02-04-21-004 released in april of 2002 , on your unit , you may also find a code # B2725 set in the body control module , fualt explination - fualt in transfer case shift control switch . GM part # 15709327 , also he is an excellent link on how to replace it yourself .

http://www.saltedwound.com/archives/2007/04/24/repair-service-4wd-light-on-2000-chevy-silverado/

i know its a siverado but its the same process . that will fix ya !

1. Remove the IP trim bezel.
2. Pull out the lamp switch, 4WD shift buttons, cargo lamp and air deflector louver assembly in order to disconnect the electrical connectors.
3. Disconnect all the electrical connectors from the lamp switch, cargo lamp and 4WD shift buttons assembly.
4. Remove the lamp switch, 4WD shift buttons, cargo lamp and air deflector louver assembly from the vehicle
5. Remove the electrical harness retainer from the IP support beam.
6. Disconnect the 2 electrical connectors from the transfer case shift control module.
7. Move the electrical harness to the left side in order to make room to turn the transfer case shift control module.
8. Rotate the transfer case shift control module about 45 degrees counter clockwise while pulling out at the same time until the module is approximately 90 degrees from the original position.
9. Pull out the module from the vehicle