2020 duramax engine knock. Total run time maybe a minute. Cyl walls look good. I took my truck to the dealer at 800 miles and they couldn’t get me out fast enough. The first service writer was caught off hairs by the noise as I pulled in. The noise is a normal operating Aug 19, 2016 · Some 2020 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks equipped with the 6. It sounds like a bad crankshaft main bearing. Oct 5, 2021 · Just bought brand new 2022 2500 HD Denali and first 150 miles or so seemed great. May 23, 2025 · 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). 6 duramax I’ve put about 3000 miles on it and noticed a knock noise it sounds just like a main bearing knocking so I brought in to let the dealership look at it and there telling me that the knocking sound is coming from the return oil pump and A knocking noise from the rear of the 2020 3500 Duramax engine often indicates injector pump or lifter problems. I honestly love the sound of the old diesels, clicks, clacks, ticks, knocks and all The noises are described below and may be heard when the engine is running or after it’s turned off. The dealership diesel tech originally though it was normal diesel sound but has know come to the conclusion there is definitely an internal engine knock. Engine knocking in the LM2 3. UPDATE: Diesel fuel additive has eliminated 90% of the knocking. Does anyone else have this issue? Also is it a valve or something else like something in the fuel system? I know sometimes an injector or injection issue will sound like valve Apr 28, 2019 · If your truck is making the noise described you know. Nov 19, 2023 · Hey all! Long time reader first time poster. Today I also started to hear it under Subtle and short lived engine knocking in a 2021 Silverado 1500 Duramax 3. (Lml engine ) currently 137,050 miles. To duplicate the engine sound: Apr 28, 2023 · My 21 denali 3l makes a engine clacking noise just before it shifts up to 4th gear rpms low ,if I give it a bit more gas higher rpms it does not do it ,runs great just makes the clacking or diesel noise ,don't remember if my 2020 3l did it ,sorry if it's a dumb question lol Nov 10, 2023 · i have a 2018 duramax 150,000 miles i have owned truck for 3 years purchased used and it coded the first day i had it def deleted and after delete started hearing a knocking noise when traveling down interstate and reduce speed by just getting off the accelerator and coasting the engine will Oct 24, 2019 · I just bought a 2020 Gmc 2500 Denali with the 6. 6 L5P Duramax Warm Engine Idle Knock Noise - (Mar 3, 2020) Condition: Customers may have a concern of a thumping or knocking noise coming from what sounds like the rear of the engine. I swapped in 4 new injectors on passenger bank with no change. Dealer says it's normal, and that there is a bulletin on it. The sound is often more pronounced in the interior of the truck as it’s amplified by the transmission bell housing. May 28, 2021 · So like the title says I have a 2020 3. 0 and it sounds like a valve is tapping until it reaches operating temperature. I plan on taking Feb 21, 2020 · At cold start yesterday morning (about 30F degrees) definitely had more like an engine rod or main bearing knock. (Bought new ) Modifications: Headgaskets /ARP Head studs (86k) 5” exhaust (86k) PPEI DSP5 built trans tunes (86k) Fuel system failure (109k miles) New injectors and fuel return line (109k) CP3 conversion Feb 22, 2020 · Banks Power has no knowledge of the "thumping knock" sound on the 2020 L5P Duramax. Truck has 46k miles, Having an issue with it that I can't pinpoint. When truck is started hot or cold (doesn't matter 70psi oil pressure or 30psi) it knocks like a ROD Apr 25, 2020 · Vehicle: 2014 GMC 3500 6. 0L Duramax can stem from low-quality fuel, carbon buildup, or timing issues. Went back in to the dealer before I even left the lot and saw the service advisor and the diesel tech who both said it was normal. Vehicles Involved: 2017–2020 GMC Sierra and Chevrolet Silverado models with the 6. 6L V8 Duramax Diesel (L5P) engine RHYTHMIC TICKING: Dec 1, 2019 · Currently my 2020 Duramax has 7900km on it, the thumping noise has escalated to a definite knocking and now can be heard at higher RPM. Piston protrusion is all within spec. Feb 22, 2020 · I picked up my 2020 Denali 2500 hd duramax this week and noticed a loud knocking at idle which increases in volume as the engine warms up. 0 when warm and accelerating from a stop. Mar 1, 2020 · #PIP5711: 2020 6. Sure sounds like The noise may be more noticeable in the first 20% of engine oil life. I now have the engine out and down to a short block. Jan 5, 2025 · Anyone heard every heard this sound in there trucks? I drove it yesterday and it was fine, fired it up before heading up to snowboard this morning and heard this knocking sound. Jul 29, 2022 · I've got a vibration that's associated with the engine that I only hear when accelerating at low speeds and certain low engine RPMs. Now I’m hearing a subtle what sounds like a ticking noise or tapping that sounds like it’s coming from left side of the engine compartment. I have a 2021 sierra denali with the l5p in it that im starting to go crazy with. This is my 4th Duramax so I am familiar with all the ticking noise complaints but this is not a tick. 6 L5P Duramax Warm Engine Idle Knock Noise Models Correction: The noise described in this communication is audible in the interior and exterior of the vehicle but is more pronounced in the interior. Jan 27, 2021 · I picked up my 2020 Denali 2500 hd duramax this week and noticed a loud knocking at idle which increases in volume as the engine warms up. Oct 1, 2020 · Some 2020 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks equipped with the 6. 6l Duramax Automatic 4x4. Dealership Nov 26, 2023 · Hello All: My 2020 Duramax has only 8000 miles. It has various ticking noises which I'm probably stuck with. Brought the truck into the Dealership last week for the tensioner recall and they wanted to keep it to deal with the engine knock. It doesn't go away until engine is warm. The engine sounds like a gem when this metallic tapping noise is not happening. Nov 14, 2019 · GM has acknowledged that some (not all) of the 2020 L5P Duramax engines are making this noise. I now have a 2020 GMC Denali HD with theI think is the L5P Duramaxand the engine sounds like it Mar 23, 2020 · While running, disabling injector 3 changes the pitch of the knock. Can hear it easily when standing outside front or when listening near front wheel wells and from inside the truck. When the truck was idling in the driveway, I would stand outside next to the front end and was impressed with how smooth the engine sounded. They have requested that the vehicle be driven to the first oil change then inspect the vehicle to see if the noise goes away. I quickly shut it off, but wanted to capture the sound to post here. Jan 18, 2025 · When I need things put into perspective as it pertains to engine noise, I just go fire up my '96 Powerstroke. Oct 31, 2019 · Thumping sound heard at idle and increases with RPM as you drive. (NORMAL?) But just the other day it developed a valve tap noise upon -deceleration (3000 rpm) like a rapid drum roll valve tap as it goes back to idle. May 16, 2024 · 2020 1500 crew 4x4 short box 3. 6L Duramax diesel engine (RPO L5P) may have a thumping or knocking sound coming from the rear of the engine. Apparently . Check for loose fuel injectors or worn lifters causing metal-on-metal sounds. It speeds up and slows down accordingly with throttle and happens in park May 29, 2020 · My 2013 GMC 2500HD was a very smooth running engine. Advise the customer that these noises are a normal function and operating condition of the L5P diesel engine. For sale 2005 quad cab short box 4x4, DIY CAI,S&B MP, PCV reroute, head gasket new with ARP studs, race plug, new t-case, new alternator, new water pump,new brake and fuel lines, new glow plugs and a new fuel cooler. Nov 28, 2020 · My brand new l5p has a nasty knock at idle. I have a really hard time believing that GM would consider this knock "normal". 0 Dmax. Check for proper fuel octane and clean fuel injectors to prevent deposits. Went back in to the dealer before I even left the lot and saw the service advisor and the diesel tech Jan 17, 2020 · Some 2020 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks equipped with the 6. The noise may be more noticeable in the first 20% of engine oil life. Mar 3, 2020 · PIP5711 2020 6. It sounds like it's coming from the right side of the vehicle, either underneath or at the back of the engine compartment. Dealers should not attempt to compare any customer vehicles exhibiting this noise with other similar vehicles as the noise is different from vehicle to vehicle and this may lead to the incorrect conclusion that the vehicle has a condition. o2fh aj2ara tiou8 eqpdq atl7z tms kh hzoceea 8bn fqgll