2003 GMC C1500 service 4wd

2003 GMC C1500
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DAVIDGMCP/U1500
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2003 GMC C1500 V8 Four Wheel Drive Automatic 120k miles

service 4 wd message lights up also there is a lot of squeaking when excelerating, also the speedometer doesnt always work
Apr 9, 2010 at 2:43 PM
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JACOBANDNICKOLAS
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If the light is on, there should be a code stored to identify the problem. The computer needs scanned to identify the problem. If I had to guess based on your description, I would say there is a problem with one of the speed sensors. Have that checked and let me know what you find.
Jun 5, 2010 at 8:11 PM