2003 Chevrolet Silverado noise coming from engine bay

Tiny
SLEDBOY2K
  • MEMBER
  • 2003 CHEVROLET SILVERADO
  • 6.6L
  • V8
  • TURBO
  • 4WD
  • AUTOMATIC
  • 190,000 MILES
Lately I have noticed a buzzing or clicking noise that comes from the engine bay, can be heard in the cab while driving but is more pronounced when idling with hood up. Sounds like a solenoid opening or closing and comes and goes in about 2-5 second intervals. I haven't heard it before and I listen to my vehicles as I'm driving them. Its a LB7 duramax and I'm kind of new to diesels. Any ideas would be appreciated. No codes, idles great, starts great, runs great, just an annoying sound I haven't heard before.
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Monday, April 13th, 2015 AT 7:39 PM

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Tiny
DR LOOT
  • MECHANIC
  • 2,311 POSTS
It could be the "glow plug relay" that is the only relay I know of on a diesel that will make enough noise that you can hear it inside the cab
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Monday, April 13th, 2015 AT 10:32 PM

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