Question about 2003 GMC Yukon Denali

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My self-leveling system is no longer working.

My yukon is equiped with the self-leveling system. I used to hear it adjusting once I turned it on or was hauling a trailer, etc...
It no longer adjusts and I do not hear the noise either.
What would you suggest checking?

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Check the ride control compressor

Posted on Jul 02, 2010

  • bkford11 Nov 21, 2010

    I had the same problem... it was the compressor.... a trip to the dealer....

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  3. Raise the vehicle until the front wheels are off the ground.
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Observe the following:



Use clean, new power steering fluid type only Hoses touching the frame, body or engine may cause system noise. Verify that the hoses do not touch any other part of the vehicle. Loose connections may not leak, but could allow air into the steering system. Verify that all hose connections are tight.
NOTE Power steering fluid level must be maintained throughout bleed procedure.
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  2. If equipped with hydro-boost, fully charge the hydro-boost accumulator using the following procedure:
    1. Start the engine.
    2. Firmly apply the brake pedal 10-15 times.
    3. Turn the engine OFF

  3. Raise the vehicle until the front wheels are off the ground.
  4. With key in the ON position and the engine OFF , turn the steering wheel from stop to stop 12 times. Vehicles equipped with hydro-boost systems or longer length power steering hoses may require turns up to 15 to 20 stop to stops.
  5. Verify power steering fluid level per operating specification.
  6. Start the engine. Rotate steering wheel from left to right. Check for sign of cavitation or fluid aeration (pump noise/whining).
  7. Verify the fluid level. Repeat the bleed procedure if necessary.

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