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Hum or Buzz Noise From Rear of Vehicle and/or Possible Dead Battery (Check Fuel Pump Relay and Replace, if Necessary)

Subject:Hum or Buzz Noise From Rear of Vehicle and/or Possible Dead Battery (Check Fuel Pump Relay and Replace, if Necessary)

Models:2007 Cadillac Escalade, Escalade ESV, Escalade EXT
2007 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2007 GMC Sierra, Yukon, Yukon Denali, Yukon XL, Yukon Denali XL
with 5.3L or 6.2L Gas Engine (VINs J, M, 3, 0, 8 -- RPOs LY5, LH6, LC9, LMG, L92) and
Built Prior to October 13, 2006

Attention: Use GMVIS to determine the vehicle build date.


This bulletin is being revised to add the production build date to the models. Please discard Corporate Bulletin Number 06-06-03-011A (Section 06 -- Engine/Propulsion System).


Condition

Some customers may comment on a buzz or hum type noise coming from the rear of the vehicle after the vehicle has been turned off. The customer may comment that the noise is intermittent and may also be associated with a low or dead battery, causing a no start condition.

Cause

The contacts in the fuel pump relay may be staying engaged after the vehicle is shut off, causing the battery drain.

Correction

Check for the fuel pump relay staying engaged (sticking). If you find that the relay is sticking, replace the relay and retest the system.

Parts Information

Part Number

Description

88988889

Fuel Pump Relay

Warranty Information

For vehicles repaired under warranty, use:

Labor Operation

Description

Labor Time

N2821

Relay- Fuel System - Replace

Use Published Labor Operation Time