Service All-Wheel Drive Light
This light should come on briefly when you turn on the ignition, as a check to show you it is working.
The service all-wheel drive light comes on to indicate that there may be a problem with the drive system and service is required. Malfunctions can be indicated by the system before any problem is apparent, which may prevent serious damage to the vehicle. This system is also designed to assist your GM dealer in correctly diagnosing a malfunction.
See also:
Doing Your Own Service Work
WARNING
It can be dangerous to work on your vehicle if you do not have the proper knowledge,
service manual, tools, or parts. Always follow owner manual procedures and consult
the service manua ...
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