Question about 1999 GMC Sonoma

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Sounds like some type of motor running (high pitched) with 4x4

I have a 2003 Chevy Avalanche and I can hear a high pitched sound coming from underneath the vehicle while idling. I have the 4x4 2hi button selected at the time, but when I select the 4hi button, the high pitch sound changes pitch for a split second but then returns to the original high pitch sound. The vehicles runs great with 74K miles and I rarely use the 4x4 mode. Why the sound?

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It is the fuel pump this is normal

Posted on Jan 30, 2009

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Posted on Jan 02, 2017

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