Question about 2000 GMC Sierra

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The service 4x4 message comes on after driving the truck around 100 miles. The four wheel drive works fine. Please advise

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A code reader won't "see" transfer case codes. If the lights were flashing you have or had a code. The code will be stored as a history code. The only codes a code reader will see are OBD Generic "P" codes. So get vehicle scanned for codes. It may have a code which can help pinpoint the problem. It may be a sensor or the switch itself. Have you ever serviced your transfer case? If not it's a good idea to do it every 30K . Keeping the fluid clean prevents fine metal particles from settling into sensors. center to get error codes, At diagnosis center you will receive the error code.As per the error code it will detect the exact faulty part in the car due to which the problem is occurring.For more help :--- at www.autozone.com its absolutely free to get car scanned.
Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Posted on Aug 28, 2010

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Your blazer is equipped with a shift on the fly four wheel drive. That means that at speeds less than fifteen miles per hour you can shift into or out of four wheel drive by simply pushing the four wheel high button. If you wish to shift into four wheel low. Stop, put the transmission into park or neutral, and push the four wheel low button. Same procedure for shifting back out. Never shift into or out of four wheel low while moving. And be careful in four wheel low. At full throttle your still barely moving, you don't want to blow your engine up!

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