Question about GMC Yukon XL

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I have a 2003 Yukon XL that will switch from Auto 4 wheel drive to 4 high or 4 low on its own. The service 4 wheel drive indicator comes on when it is in 4 wheel drive. The fluids in the transfer case have been checked and the level is fine and appear clean. Any suggestions?

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My 2003 yukon xl does the exact same thing. Sorry that I do not have a solution, but I figure its the same reason the daytime running lights always burn-out. The SUV in general has be an absolute POS and I will never buy another.

Posted on Nov 11, 2009

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4 Wheel drive not functional


There is a TSB on this problem: TSB #03-04-21-001C

Subject:4WD Switch Indicator Lights Flashing, 4WD Inoperative, DTCs C0327, P0500, P0836, P1875 Set (Replace Encoder Motor Sensor, Reprogram TCCM, Inspect Front Drive Axle Engagement Sleeve for Damage/Repair) #03-04-21-001D - (12/04/2003)



Models:2003 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2003 GMC Sierra, Yukon, Yukon XL
with 4WD and Electric Shift or Active Transfer Case (RPO NP1 or NP8)
You can also try removing the TREC fuse (engine fuse box) and reinstall after 30 seconds. Look up the TSB number I gave you and you'll find alot more information.

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Most of the time this problem is caused by the 4 wheel drive switch. Usually you can just replace the switch and that will fix the problem. I have replaced many of those switches and that has fixed the problem.

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