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I have a 1999 GMC Sierra 4X4 truck it has a.

Tiny
ANONYMOUS
  • MEMBER
  • 1999 GMC TRUCK
  • 120,000 MILES
I have a 1999 GMC Sierra 4X4 truck it has a message on the message center that says service 4WD. I took it in and the serviceman couldn't find anything what gives it the message?
Friday, March 22nd, 2013 AT 12:15 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Service AWD/4WD Indicator Lamp

Illumination of the Lamp indicates a problem with the drive system.
There will probably be a Transfer Case Code set to aid in diagnostics.

The only way to get the light to go off is to clear Transfer Case codes.
This light can NOT be shut off or reset any other way.
Transfer Case codes should be read and repaired before clearing them.
Refer to Transfer Case. See: Transfer Case Testing and Inspection

The procedure for reading diagnostic trouble code(s) is to use a diagnostic scan tool. Read Diagnostic Trouble Codes Using a Tech 1, Tech 2 or Other Scan Tool.

When reading DTC(s), follow instructions supplied by tool manufacturer.
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Friday, March 22nd, 2013 AT 12:27 AM

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