Question about 2005 GMC Sierra

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I have a 2005 GMC Sierra. After driving for a couple of miles the 'service 4wd' warning will display and not go away. The 4wd is fine. Do I need to reset a chip?

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BY YOU HAVING AUTOMATIC 4 WHEEL DRIVE.YOU HAVE A SHIFT CONTROL MODULE IN TRANSFER CASE.IT CONTROLS YOUR 4 WHEEL DRIVE SYSTEM BY RECEIVING INFORMATION FROM SPEED SENSOR ON TRANSFER CASE OUT PUT SHAFT.TAKE IT TO DEALERSHIP.THEY WILL HAVE TO FIX IT.

Posted on Jul 20, 2009

  • vctr79moore Jul 23, 2011

    I had a problem with my A/C blower. thanks for solving my problem (it was the Blower Motor Control Module) now," I'm cool again". Thanks

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1 Answer

I have a 2005 GMC sierra z71 with the service 4wd warning on when the vehicle is started. It has the push button style 4wd and about 113000 miles on it. I have recently replaced the shift motor and this...


dont guess, do read the manual, its in the FSM>
shows how it works and how to diagnose it, not guess.
GM sells, the FSM,
or you can look here.
at alldata dot com, its all there.
same thing at mitchels too.
ondemand5 dot com.

diagnose it, guessing is expensive and long down times.

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