| 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 |
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some owners may comment on a power steering pump whine noise. This whine noise is most commonly heard between idle and 2000 rpm coming from the power steering pump.
Recommendation/Instructions:
Reports 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 case 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.
