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2001 Chevy Silverado service 4 wheel drive light

Tiny
RILLO
  • MEMBER
  • 2001 CHEVROLET SILVERADO
Drive Train Axles Bearings problem
2001 Chevy Silverado V8 Four Wheel Drive Automatic

The service 4 wheel drive light came on. I have replace the dash switch. Which did not fix the problem. I have no lights come on the switch and no 4 wheel drive engaging. I have been told probably the encoder motor is bad or the sensor is bad. I do have 12 volts on the back of the switch but no lights come on the switch. I also tried to get a test light to come on at the plug going into the encoder motor with no volts (I could only check 3 of the 6 wires at the plug. Is there any way I can insure the problem to be the motor or the sensor? Why no lights on the switch? No blown fuses anywhere that I can find. Any help would be great.
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Monday, June 14th, 2010 AT 7:40 PM

1 Reply

Tiny
02REDCAMARO
  • MECHANIC
  • 65 POSTS
No lights on the switch? Strange. I wonder if there is power to the switch at all, at least it should light up when you turn your headlights on. Encoder motor? You mean the solenoid on the front diff that engages the front axles? If the solenoid is bad, the switch should still light up. I'd check the connectors on the switches and at the front diff.
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Sunday, June 20th, 2010 AT 5:40 PM

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