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Discussion Starter #1
I own a 2012 Rubicon JKU with 38,000 miles on the odometer. I have recently experienced hearing a buzzing sound coming from underneath the hood at start up. The buzzing sound does not happen in the mornings… only late afternoon. The buzzing sound last 2 to 3 seconds and only happens when the jeep has been sitting for several hours and it’s above 90 degrees outside and at best is intermittent. There are no error codes being reported by the computer. The buzzing sound is like an old fashion buzzer. Anyone else experiencing a similar problem?

Thanks,
Russ
 

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Probably your vacuum pump. mine will occasionally do that on startup and when I am climbing obstacles. makes everyone think I have ARB's lol

as far as I know it is normal. Mine is relocated into the engine bay, is yours?
 
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