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03 GMC Sierra 4WD Transfer Case Problem


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I have a 03 GMC Sierra 1500 Z71 SLT with push button 4x4. The 4x4 wont shift at all now, when I hit 4H the light just flashes, if I hit 4L, its like Im geared down, but the front driveshaft doesnt engage. The Service 4WD message is also on. Ive been reading about the encoder motor or sensor as well as the transfer case module. Any ideas?

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Scan for codes, without that it's just shooting in the dark. You'll need a scanner that can pull C codes, autozone and oreilly's rent them out for free. Sounds like either the encoder is bad or there are clutch problems. These parts are expensive and are not worth guessing. Post back with results.

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