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2005 Yukon XL loses shifting/acceleration in 2WD - trans/not trans?


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A few weeks ago, I noticed it was acting sluggish. Shortly thereafter, I lost all acceleration in drive. I pulled over, tried R, still with no acceleration. The vehicle also wouldn't go into park. It seemed to be stuck in neutral. My husband was able to get it moving in 4WD. Took to mechanic, no codes thrown, no issues found, began working in 2WD again, was told to keep driving it. It "clunks" when shifting between P/R/N/D in 2WD.

 

Yesterday, the Yukon switched to Auto 4WD. I switched it back to 2WD. It took 5 miles, but I experienced the same problem. This time I was unable to completely turn off the ignition. I could switch it back one click to battery, but not remove the key. To get it running, I had to

- Switch to N

- Turn on car

- Switch to D

- Switch to 4WD

 

When I switched to 4WD, the truck lurched like it had been rear ended (not a fun experience). I was able to limp it home - it didn't want to accelerate or make turns.

 

My mechanic isn't really sure what the issue is, and I'm not up for the "replace parts until it works" game. Any ideas?

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