Power Steering Whine Noise - keywords fluid gear hose idle pump turn
| Subject: | Power Steering Whine Noise |
| Models: | 2003-2007 Cadillac Escalade, ESV, EXT |
| 2003-2007 Chevrolet Avalanche, Silverado, Silverado Classic, Suburban, Tahoe |
| 2003-2007 GMC Sierra, Yukon, Yukon Denali, Yukon XL, Yukon XL Denali |
| 2003-2007 Hummer H2 |
This PI was superceded to change the recommendation statement. Please discard PIT4208.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some owners may comment of a power steering pump whine noise. After normal diagnostics you may find the noise to be coming from the power steering pump. This whine noise is most commonly heard between idle and 2000 rpm coming from the power steering pump.
Recommendation/Instructions:
GM Engineering has not evaluated this concern, but reports from GM Dealers of flushing and refilling the power steering system with Valvoline SynPower Power Steering Fluid have reduced or eliminated this noise. Valvoline SynPower Power Steering Fluid is a synthetic fluid and is available at most auto parts stores in quart size containers. In most cases 3 or 4 quarts will be needed to flush and fill the system.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
