GM Service Manual Online
For 1990-2009 cars only

Possible Cause

Correction

The pump belt slips.

Inspect the belt for looseness or wear, repair as needed. Refer to Drive Belt Replacement 5.0L,5.7L or Drive Belt Replacement 4.3L or Drive Belt Replacement 6.5L Diesel or Drive Belt Replacement 7.4L in Engine Mechanical.