2006 - 2009 Cadillac XLR and XLR-V: Service Bulletin: #PIC4050A: Whine Noise from Power Steering at Cold Start

#PIC4050A: Whine Noise from Power Steering at Cold Start - keywords air foam growl left right steer wheel - (Jun 27, 2008)

Subject Whine Noise from Power Steering at Cold Start  
Models 2006 - 2009 Cadillac XLR and XLR-V

This PI was superceded to include model years through 2009. Please discard PIC4050.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.


A whine or growl noise may be noticed from the power steering at cold start. This noise may be due to residual air in the power steering system. Foaming of the fluid may also be noted.

  1. With the vehicle at normal operating temperature, raise the front of the vehicle so the front wheels are suspended.
  2. Start the vehicle and turn the steering wheel from lock to lock 20 times.
  3. Allow the vehicle to sit overnight and retest. If the noise is still present, repeat the process 1 more time.

Note: Prior to performing the steps above, be sure to check the power steering fluid level. If the fluid is low, fill to the proper level and evaluate.

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.

Posted by: Rob Loszewski - January 8, 2020. This article has been viewed 1897 times.
Online URL: https://www.xlr-net.com/knowledgebase/article/2006-2009-cadillac-xlr-and-xlr-v-service-bulletin-pic4050a-whine-noise-from-power-steering-at-cold-start-138.html

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