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The last couple of times I have started up the truck, the Service 4 WD light came on for about 2 seconds and goes out. The 4 wheel drive seems to be working alright. Do I have a problem I need to take it to the "Sealer" to fix. Warranty is about to run out so any help would be appreciated.
 

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Definiately take it in and get it fixed under warranty. This bulletin might apply.
<H1>Service 4WD Indicator Illuminated, DTC B2725 Set (Replace Transfer Case Shift Control Switch) #02-04-21-004 - (04/15/2002)</H1>


</TABLE>"Service 4WD" Indicator Illuminated, DTC B2725 Set (Replace Transfer Case Shift Control Switch)


1999-2002 Chevrolet and GMC C/K Pickup and Utility Models (Silverado, Sierra, Avalanche, Suburban, Tahoe, Yukon, Yukon XL)


with Four Wheel Drive and NVG 236/246 Transfer Case (RPO NP8)<A name=ss1-877978><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=877978&pubid=210#ss1-877978" target="_blank">
<H5>Condition</A></H5>


Some customers may comment on the Service 4WD indicator illuminating. Upon investigation, the technician may find DTC B2725 set.<A name=ss2-877978><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=877978&pubid=210#ss2-877978" target="_blank">
<H5>Cause</A></H5>


The condition may be due to a intermittent fault in the transfer case shift control switch.<A name=ss3-877978><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=877978&pubid=210#ss3-877978" target="_blank">
<H5>Correction</A></H5>



<H4>Important</H4>


The transfer case shift control module should not need replacement. DO NOT replace P/N 15749703 unless diagnosis points to the module as the malfunction.





Replace the transfer case shift control switch using published Service Information procedures.<A name=ss4-877978><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=877978&pubid=210#ss4-877978" target="_blank">
<H5>Parts Information</A></H5>



<TABLE width="100%" border=1>
<T>
<TR>
<TH vAlign=bottom align=middle>


Part Number</TH>
<TH vAlign=bottom align=middle>


Description</TH></TR>
<TR>
<TD vAlign=center align=middle>


15709327</TD>
<TD vAlign=center align=middle>


Transfer Case Shift Control Switch</TD></TR></T></TABLE>


Parts are currently available from GMSPO.<A name=ss5-877978><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=877978&pubid=210#ss5-877978" target="_blank">
<H5>Warranty Information</A></H5>


For vehicles repaired under warranty, use:



<TABLE width="100%" border=1>
<T>
<TR>
<TH vAlign=bottom align=middle>


Labor Operation</TH>
<TH vAlign=bottom align=middle>


Description</TH>
<TH vAlign=bottom align=middle>


Labor Time</TH></TR>
<TR>
<TD vAlign=center align=middle>


K4123</TD>
<TD vAlign=center align=middle>


Switch, Transfer Case Select - Replace</TD>
<TD vAlign=center align=middle>


Use published labor operation time</TD></TR></T></TABLE>






<TABLE width="100%">
<T>
<TR>
<TD align=left width=778>GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
</TD>
<TD align=middle width=42>
</TD>
<TD align=middle width=167>WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION
</TD></TR></T></TABLE>
© Copyright General Motors Corporation. All Rights Reserved.
 

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My light stays on. If i take my truck in without a cat, and muffler are they going to bust me?
 
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