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Q: Power Steering or Suspension on 2004 GMC Yukon Denali

When at still and try to turn right steering is very hard. Left is fine. Is it a problem with my power steering or suspension??
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There is a technical service bulletin that refers to this type of problem, I would take this to your GMC Dealer and have them perform the test procedures listed in the bulletin. Make sure you check your tire pressures first though!
TSB #05-02-32-008B: EI06002 - 670 Gear Box Power Steering Pump, P/S Performance Concerns - (Jul 18, 2007)
Some customers may comment on a lack of steering assist when stopped or during parking lot type maneuvers. A lack of steering assist could occur if the brakes are applied and turning the steering wheel with the vehicle stopped or during parking lot type maneuvers. This condition will go away or greatly improve once vehicle begins to move or is above parking lot speeds. This concern can be aggravated by worn tires, low tire air pressure, low power steering pump pressures, and tires larger than stock size.
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