Vehicle is not able to switch into 4wd

2002 CHEVROLET SILVERADO
250,000 MILES • 6.6L • V8 • 4WD • AUTOMATIC
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JEREMY0507
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  • 27 POSTS
When the buttons are pressed there is nothing .I checked fuse, plug to actuator and ground .I am going to clean ground. Possibly encoder motor or ring?
Nov 16, 2020 at 10:07 PM
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KASEKENNY
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  • 18,907 POSTS
Couple questions. First, which transfer case do you have? Take a look at the attachment for the options.

Next, when you press the button does the indicator light come on? If not, the switch could be the issue or you may not have power to the switch so let's start with what system you have and the detail about what happens. Maybe a video of you pressing the button will get us on the same page quickly.

Let us know and we can go from there. Thanks
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Nov 16, 2020 at 10:34 PM
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JEREMY0507
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  • 27 POSTS
It is my father in laws truck. I will check on the transmission. When the button is pressed nothing lights up. Nothing happens. Appreciate the help.
Nov 16, 2020 at 10:51 PM
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KASEKENNY
  • ✓Experienced Mechanic
  • 18,907 POSTS
Okay. So depending on what transfer case that is we will need to look at the switch and other electrical components. Depending on which one there could be a control module issue as well. We will wait to hear back on which one and go from there. Thanks
Nov 17, 2020 at 10:06 AM
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