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Duramax Sixth Generation: 2017+ (L5P) Discuss the sixth generation (2017+) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.


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Old 11-14-2019, 07:02 AM   #1 (permalink)
Gnewman
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2020 L5P Throbbing Sound While Idling

Just traded my 2018 2500 Duramax for a new 2020 2500 L5P and notice a throbbing sound at idle when the engine is warmed up ( currently 2200km). Dealership says it is covered under the #16-NA-32 Bulletin on common engine noises Duramax 6.6L, but this is not the ticking or cycling that I have heard on my previous Duramax. Has anyone else experienced this on the 2020 L5P?

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Old 11-14-2019, 09:02 AM   #2 (permalink)
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Old 11-14-2019, 09:41 AM   #3 (permalink)
Rvn4me
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Is this Sound synched with engine rpm.
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Old 11-14-2019, 11:31 AM   #4 (permalink)
Gnewman
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Yes if you increase the rpm the sound seems to be reduced or blends into the engine noise. Should also add that the sound seems to be deep in the passenger side of the engine
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Old 11-14-2019, 12:28 PM   #5 (permalink)
heymccall
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When my trucks and machines are in "regeneration", the engine intake emits a thrumming sound. This goes for Cummins, Cat, and Duramax engines.
Could your truck be in "regeneration"?
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Old 11-14-2019, 04:40 PM   #6 (permalink)
Gnewman
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I don't think it is regenerating it has 2200 km on it and has been doing it since I took delivery at 60km
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Old 11-15-2019, 11:42 AM   #7 (permalink)
Gnewman
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Added this so anybody interested can hear the engine noise I am referring to
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Last edited by OkDually; 11-15-2019 at 12:08 PM. Reason: repaired video link
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Old 11-15-2019, 12:10 PM   #8 (permalink)
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Quote:
Originally Posted by Gnewman View Post
21ADE654 B536 41E9 8E19 21E5B06B7403 - YouTube

Added this so anybody interested can hear the engine noise I am referring to
Sounds like the pulse of a vacuum pump to me
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1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
AirDog II DF165 w/ tank sock delete - XDP
TD-Max boost controller - Kennedy Diesel
OPS extension hose - Leroy Diesel
Glow Plug Harness- PT Wiring Solutions
Glowshift Maxtow EGT,Boost, Fuel gauges
Boost & Fuel Pressure Bolts - Leroy Diesel
2/0 Battery Cable Upgrade - PT Wiring Solutions
PMD w/#9 resistor and Re-Location Kit, mounted to bumper - Leroy Diesel
GM-5 Turbocharger
4.10 gear ratio
OptiLube Winter Formula


Proud member #1039 of The 3500 Dually Club

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Old 11-15-2019, 08:13 PM   #9 (permalink)
hemikilr
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I have the same sound on mine.5900 miles
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Old 11-16-2019, 02:22 PM   #10 (permalink)
Gnewman
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Have our brought the issue up with the Dealership? I have confirmed that the sound is not normal, other 2020 2500 Duramax do not have the throbbing sound

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