Duramax ticking noise

The truck is a 2006 2500HD with LBZ Duramax and 6-speed Allison, <19,000 miles. The drivetrain has been making what I would describe as a chorus of LOUD cracking, snapping, popping and ticking sounds during cold and warm starts when the ambient temperature is about 65*F and higher. It doesn't make the noise every cold / warm start …

TrailBurner. 950 posts · Joined 2013. #5 · Jun 10, 2014. use a long screw driver to help locate the noise, top or bottom of the motor. Put one end on the engine and one end on your ear, it will magnify the sound. 86 253cc, 40pwk, CT OOF pipe. 99 583 Formula Z. 74 340 TnT- in progress/restoration. Owner, hellabrokeNH- coming soon.lb7s are notorious for making ticking noises, it has to do with the tolerance in the engine. That can be one answer, another answer could be an injector is going bad, but i wouldn't worry about that if you're not seeing any difference in the trucks driving. 2002 2500hd 4x4 Lb7, 4 inch magnaflow with 5 inch tip. Save Share.2020 Duramax thumping sound. Thumping sound heard at idle and increases with RPM as you drive. Can hear it easily when standing outside front or when listening near front wheel wells and from inside the truck. This is my 4th Duramax so I am familiar with all the ticking noise complaints but this is not a tick.For the un-informed, this is when your beloved engine starts to make an EXTREMELY annoying, loud tapping (ticking, clacking, etc.) sound similar to a valve or lifter tapping on a gasser. This is usually accompanied by massive power loss (my LB7 dropped 40 HP and 96 FT LBS at the wheels, seriously.)I have a ticking sound in my Duramax that is getting louder and louder. It is reminiscent of a bad lifter and gets louder under load. It occasionally gets quieter after it sits hot for a few minutes and I restart. Answered in 2 minutes by: GM Mechanic: GM Tech (Cam) GM Tech (Cam) : Hello, I'm Cam. Please include all the details about your issue ...New brakes (pads, rotors, and clips) all the way around yet there is still a clicking noise that increases with speed in the front end. I can hear it from both sides of the truck and the noise doesn’t go away when braking. Turning left or right doesn’t affect it and it’s occasionally intermittent. I’ve checked for rocks or nails in my ...

Ticking noise under acceleration. Hi everyone my 05 LLY has developed a awful tick under load. I believe it may be dirty injectors. Still plenty of power and I use Howes diesel treat with every tank. I got fed up a added half a bottle to one tank and the sound went away but next tank it came right back. It started to happen about a year ago and ...All Duramax™ engines are manufactured to very close tolerances to meet the durability and reliability standards. Cause This ticking noise is caused by oil bubbling and excited by the V8 configuration and combustion sequence. The noise could be described as an irregular ticking or clacking sound, like random typing on a mechanical typewriter.The FDA recently lifted the clinical hold on Inovio's Covid-19 vaccine candidate. The result could mean huge returns for INO stock. Good news from the FDA could mean big gains for ...435 posts · Joined 2015. #1 · Feb 10, 2017. just noticed this noise the other day, it's obvious in drive but quiets down in park. checked my balance rates and they seem kind of all over the place, but 1 & 3 are the worst. The noise sounds like its from the passenger side so that makes me think those two are the culprit.I have a similar ticking noise in my 2017 Sierra but I only notice it at really low speeds. It stops when the truck stops and immediately picks back up when you let off the brake and the truck starts to move on idle. ... A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. Come join the discussion about ...Locating and repairing a ticking noise on a 2015 chevy silverado 6.6 duramax turbo diesel. #2 fuel injector copper washer was blown out so we cleaned everyth...The most overbought stocks in the industrials sector presents an opportunity to go short on these overvalued companies. The RSI is a momentum ind... The most overbought stocks in ...The noise is a normal operating. Page 2 October, 2020 Bulletin No.: 16-NA-372. characteristic and has no short or long term effects on the engine. DO NOTattempt repairs for this noise. •DEF Injector Noise:A tick noise may be heard coming from under the vehicle and typically it is heard at low vehicle speed and especially next to a building ...

Ticking Noise.....underload Jump to Latest Follow 30K views 12 replies 7 participants last post by copper duramax Mar 5, 2009446 posts · Joined 2009. #5 · Jan 31, 2009. mine has a ticking noise but it is comming from the belt tensioner. NAME: Tyrone. 2001 GMC SLT 2500 HD Crew Cab short box 4X4 LB7. 4" straight exhaust 285/75/r16 210,000miles. Auto Meter Carbon Fiber Ultra Lite Pyro, Boost Gauges. PPE Boost valve.:gearjamin.Apr 25, 2009 · Ticking noise Jump to Latest Follow 3K views 7 replies 4 participants last post by abbo Apr 26, 2009 I have a knocking noise upon deceleration on my 2017 duramax Silverado.. It happens between 1600-1100 rpm. As I decelerate between this range, it will start to knock at around 1600 then go away at around 1500 then start again around 1400 and stop at around 1200 and a third time at 1100. It sounds like a lifter smacking the camshaft.1. Low Oil Level. Most often, the ticking is caused by a low oil level and will go away as soon as the system is topped off. When the engine doesn’t have the right amount of oil, pressure drops and ticking begins. Ticking might intensify as you accelerate or push the car harder.New York. Feb 20, 2014. #1. Recently completed the head gaskets on my 05 LLY. Overall things went back together smoothly but truck has a few issues now that its back running. 1. The truck developed a pretty substantial ticking noise after gasket replacement. It was not that bad during the initial startup, but during test drive when engine was ...

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The next noise is a tick typically heard at low vehicle speed and especially next to a building, like when going through a drive through. This is the DEF Injector and again is normal noise. The last noise is a rhythmic tick. This sound will require further diagnosis and may be accompanied by a loss of power, misfire and an SES lamp …a bad flexplate will sound somewhat like a bad rod and should not be ran it can destroy the bellhousing and back of motor if it comes apart. if you pull the dust cover on the bellhousing and the flexplate is cracked and you try to move it by hand it will make noise. 01 gmc sierra. 160,000 miles. new injectors at 160,000.This noise is caused by the relationship of the engine cylinder block, crankshaft journals, bearing inserts and the oil film. This relationship may allow a vibration that resonates through the cylinder block and is heard as a metallic ticking noise. The noise could be described as an irregular ticking or clacking sound, like random typing on a ...Rhythmic ticking noise: A rhythmic ticking noise during deceleration may be present. The noise is usually more pronounced from the passenger side of the vehicle but may be evident in other positions. The source of the noise is from the fuel injectors pulsing and this should be considered a normal characteristic with no service …

053500cc. 128 posts · Joined 2005. #5 · Feb 1, 2006. I had this happen when I had my 2003, I thought it was my brake box, but I found out that if you have the climate control set to blow out the vents, which is all the way counter clockwise, it is like it is trying to move the door under the dash too far and I would get a clicking sound.18. Nowhere, KS. Aug 2, 2014. #1. So I noticed since my last oil change that my truck is making a ticking sound that seems to be more on the left side of the truck . I cannot …Ticking noise. Jump to Latest Follow 41 - 41 of 41 Posts. 1 2 3. Durallymax · DuramaxForum Veteran. Joined Mar 3, 2008 · 4,790 Posts #41 · Mar 4, 2010 (Edited ... Chevy and GMC Duramax Diesel Forum. 3.8M posts 207.6K membersThere are many reasons why a car makes a ticking sound when the accelerator is pushed. One of the most common reasons is the car is low on oil. If this is the problem, the sound wi...Ticking Noise when Engine Block Heater plugged in. ... Fuel race valve, duramax tuner LBZ induction kit, BD High flow manifold,SDP full EGR delete w/ LB7 up pipe Rareparts G2 tierods, rare parts pitman, ultimate idler arm, supersteer idler pivot, cognito UCAs leveled with 315/70/17's, Monomax shocks, ...Apr 7, 2021 · All Duramax™ engines are manufactured to very close tolerances to meet the durability and reliability standards. Cause This ticking noise is caused by oil bubbling and excited by the V8 configuration and combustion sequence. The noise could be described as an irregular ticking or clacking sound, like random typing on a mechanical typewriter. 06 Black LT3 CCSB Duramax/Allison, EGR blocked, MA sleeves, MA pump rub kit, cognito braces, EFI Live, Banks exhaust, transgo jr., BD manifold, MBRP downpipe. ... "A random ticking noise may be heard in some LB7/LBZ's with the engine running at idle speed and with the coolant warmed to a temperature of 70 degrees Celsius or above. An …Ticking after oil change. :help had the truck for about a month (09 2wd with 84K). Dealer told me they changed the oil but it was black and smelled burnt so I decided to change it. The filter was torqued on like a mother, anyway I changed the oil with 15w40 regular rotella and a cheap fram filter.26. 0. 1. Jan 21, 2017. #1. Do any of you L5P owners notice a tapping or knocking noise that is synched with engine rpm when you let off the accelerator and coast? It only seems to happen between 1,000 and 1500 rpm. My 16 LML made a similar noise sometimes, but this L5P seems to do it more. It's not the typewriter tick, that's for sure.

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Aug 29, 2017 · All Duramax™ engines are manufactured to very close tolerances to meet the durability and reliability standards. Cause This ticking noise is caused by oil bubbling and excited by the V8 configuration and combustion sequence. The noise could be described as an irregular ticking or clacking sound, like random typing on a mechanical typewriter. D. Dave Geiger Discussion starter. 47 posts · Joined 2011. #1 · May 28, 2012. My LBZ has a ticking noise when it idles sometimes. The injector ballance rates are very good, as the truck has 40k on it. I can't locate it, it's easily heard from both passenger and drivers side of truck. It isn't noisy any other time.could possibly be the typewritter tick. Our old duramax had this weird ticking noise at idle and i believe it ended up being the bolts on the flywheel or something along those lines. I just know that my buddy fixed it for me when I took it into the dealership for a service. 2003 silverado 1500 - RIP. 2005 Sillverado 1500 - SOLD.I have a ticking sound in my Duramax that is getting louder and louder. It is reminiscent of a bad lifter and gets louder under load. It occasionally gets quieter after it sits hot for a …Engine ticking on new 2024 sierra hd duramax. Picked this truck up Monday. About 180 miles so far and noticed this ticking coming from the engine. I’ve never owned a diesel truck so not sure if this is normal… but I didn’t notice it the first few days… any ideas? That’s the “type writer tick”. They all do it.Oct 11, 2015 · Weird ticking noise on 2015. It only happens while the truck is running and it's coming from the engine clearly herd from the wheel wells. It sounds like a hot exhaust cooling down and the crack/pop/ticks you get. Again it happens ONLY while running and the truck is not in a regen. Apr 10, 2023 · My 2023 has a ticking sound that is not the DEF injection tick, it is not a ticking or sound I have heard with modern diesels. I have been aware of that DEF tick tick sound for years with many different diesel trucks. This is an odd ticking that speeds up on acceleration as well as deceleration when downshifting relates to RPM advances. ticking sound. jump to latest follow ... 04 chevy duramax lly, banks intercooler, banks cai, killerbee ported intake elbow, ppe race valve, mbrp front pipe and down pipe, banks exhaust, ppe tie rod sleeves, built tranny from g&w diesel in memphis, 15% injectors, keys and blocks, 35s, 20s, 4.56's, and of course efi live from rob! ...The most overbought stocks in the industrials sector presents an opportunity to go short on these overvalued companies. The RSI is a momentum ind... The most overbought stocks in ...

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astrungis. 4 posts · Joined 2011. #25 · Jan 24, 2011. Just got a 2011 Chevy HD3500 Duramax. The Silverado book says it was filled with "Dexos" but the LGH and LML Duramax Diesel supplement book says to use API CJ-4 oil. There are no stickers under the hood near the dipstick/oil fill to indicate either.The ticking sound could be a number of things that have already been described, but the combination of ticking/chirping could be as simple as your belt and/or idler arm. I see you are in ND. If your belt is old coupled with the cold temps, that could also describe your problem. It's a simple idea I know.'01 2500HD Duramax LB7, Xtra cab - short box w/ 8' Blizzard Plow, otherwise bone stock. ... Idle it sounds normal Cruising is normal but under acceleration it has a weird sound to it. Like a loud ticking or soft knocking noise to it. Please :help . SOLD TRUCK: 2003 Silverado 2500HD, Ext Cab, Short Bed TUNER:Quadzilla On 90HpFor More Info visit us at: http://1aau.to/h/cKE/In this video, Andy diagnoses a top end clicking or ticking noise in our Chevy Avalanche! Andy locates the cl...284 posts · Joined 2010. #1 · Sep 21, 2010. i just picked up a 2006 lbz with 130k on it, it seems to have a loud tick at idle, is that the injectors or is that the way that the lbz's are suppose to be, kinda sounds like lifters, just changed the oil today i am gonna change the fuel filter thursday any ideas? another thing can you hear the ...Alright I need help. I have got an 05 duramax with 165k miles. Had GM replace all injectors 14 months ago. However the motor has developed a loud knocking noise. When the noise first became present, I stopped at a truck stop and poured in some Lucas injector cleaner. The noise then went away, but after a few days, the noise is back.Alright I need help. I have got an 05 duramax with 165k miles. Had GM replace all injectors 14 months ago. However the motor has developed a loud knocking noise. When the noise first became present, I stopped at a truck stop and poured in some Lucas injector cleaner. The noise then went away, but after a few days, the noise is back.The Ticking noise is normal. Here is a GM Bulletin on It. INFORMATION Bulletin No.: 02-06-01-022M Date: March 30, 2012 Subject: Information on Diesel Engine Ticking Noise Models: 2001-2012 Chevrolet Silverado 2003-2009 Chevrolet Kodiak C4500/C5500 Series 2006-2012 Chevrolet Express Vans 2001-2012 GMC Sierra 2003-2009 GMC TopKick C4500/C5500 SeriesMuch of the noise that occurs in intercom systems arises from the coupling of DC and AC signals. The elimination of the noise, while retaining the primary signal, is the goal of co...No its not hurting it. You can try & find another oil brand thatll maybe reduce the tick noise, or you just live with it. I use Rotella T in my LMM & Mobil Delvac Super in the LML. The tick is louder/more noticeable in the LML with Mobil Delvac Super. Both engine had been using Valvoline Premium Blue 15W-40, & the tick wasnt as noticeable. Go ...372 subscribers. 11. 1.9K views 2 years ago. **Turn up the volume** Random/Intermittent ticking sound on a 2020 Duramax L5P. Occurs for the first 500 … ….

445 posts · Joined 2013. #7 · Mar 8, 2015. For some reason I was thinking you weren't hearing the noise at idle. Research "Typewriter Tick" and see if that's your problem. If it is than you have nothing to worry about. 2015.5 Denali 3500 SRW/CCSB - Iridium Metallic, all options. Curt Q20 5th Wheel, Access Tonneau Cover.The noise could be described as an irregular ticking or clacking sound, like random typing on a mechanical typewriter. This condition has been present in diesel engines produced for the last 20 or more years. The overall noise reduction in engines produced today makes this noise seem new when, in fact, it was masked by other noises in the past.That’s the “type writer tick”. They all do it. No worries. You’ll notice it more with fresh oil. Every Duramax makes that noise, it’s just more noticeable with L5P cause they run …2023 6.6 NOISE QUESTION. Hey guys, just bought my 1st NEW Duramax (EVER) and have a question. The truck is a 2023 GMC AT4 HD! Have owned many used high mile 6.6 trucks and still have a 16 Denali 2500HD with 209k miles that was put on a diet.Learn about different types of ticks, and how to avoid and remove them. Trusted Health Information from the National Institutes of Health As people spend more time outdoors, so do ...Ticking noise. Jump to Latest Follow 4K views 5 replies 4 ... Hot rodding duramax trucks since 2004.The noise could be described as an irregular ticking or clacking sound like random typing on a mechanical typewriter. This condition has been present in diesel engines produced for the last 20 or more years. The overall noise reduction in engines produced today makes this noise seem new when in fact it was masked by other noises in the past.After replacing Every Pulley including A/C Clutch Assembly it turned out to be the Serpentine Belt...who knew! Duramax ticking noise, hello every one!!in this video I show you how IU diagnossed an engine tapping noise on this 01 duramax.I was using the autel DS708 to diagnoss it and i show ..., The Duramax ticking noise on acceleration is often caused by an issue with the fuel injectors or lifters. These components may become worn or dirty over time, resulting in the ticking sound. On this exciting adventure as we uncover the secrets behind the ticking noise of acceleration., By promptly addressing an issue of this nature, you will minimize the occurrence of serious, and permanent component damage. The following are several likely causes of engine ticking, following the completion of an oil change. Low oil level. Loose oil drain plug. Loose oil filter., Hey guys, noticed this ticking sound earlier today ( I just bought the truck a few days ago) 2006 LBZ with 42k miles. ... with 6.6L Duramax(TM) Diesel Engine (VINs D, 1, 2 - RPOs LBZ, LB7, LLY) Supercede: This bulletin is being revised to add model years and remove RPO LMM. Please discard Corporate Bulletin Number 02-06-01-022G …, 1 post · Joined 2024. #12 · Mar 9, 2024. 2019 L5P Duramax GMC 3500HD DWR Good news I think found typewriter noise. I had the oil pan (pacific performance engineering pan )because original pan drain plug is too high and all oil don't drain out. now the noise is gone, I'm thinking the oil pick tube up was hitting the bottom of pan., Collective Growth Corp is the first and largest SPAC focused on building the U.S. commercial hemp supply chain....THCB Cannabis SPACs have been the most popular form of investment ..., The following information describes these noises: • Rhythmic Ticking: This is a rhythmic ticking that can be heard during deceleration. The noise is usually, but not limited to, heard coming from ... Transmission, Duramax, 6.6L, Tick, MW7, Tick, Clicking, Noise GM bulletins are intended for use by professional technicians, NOT a "do-it ..., Chevy / GMC Duramax 01-04.5 LB7 Forums. 01-04.5 LB7 Duramax Powertrain. That darn knocking / clacking / ticking noise. Jump to Latest Follow ... Like a loud ticking or soft knocking noise to it. Please :help . SOLD TRUCK: 2003 Silverado 2500HD, Ext Cab, Short Bed TUNER:Quadzilla On 90Hp, Jul 23, 2018 · • Rhythmic Ticking: This is a rhythmic ticking that can be heard during deceleration. The noise is usually, but not limited to, heard coming from around the passenger side of the vehicle. The noise is from the fuel injectors firing (one injector per deceleration and not always the same injector) and is a normal function of the engine and ... , Rod knocks, sticky or bad lifters, faulty glow plugs, lousy fuel injectors, old engine parts, and low or dirty engine oil — causing lack of lubrication are the common causes of ticking noise from a diesel engine. While diesel engines are much louder than gasoline engines, do not ignore any unusual sound from a diesel engine., 87 posts · Joined 2009. #1 · Jul 12, 2013. I bought my 08 LMM with 163k on it and no noise. Now with 171k it has developed a ticking/knocking in the front of the passenger head. Any ideas how to resolve before it gets worse or before I start tearing in blind. tick tick - YouTube. 2008 GMC Sierra 2500HD CC/SB. 285/70/17 Fierce Attitudes., Jul 23, 2018 · • Rhythmic Ticking: This is a rhythmic ticking that can be heard during deceleration. The noise is usually, but not limited to, heard coming from around the passenger side of the vehicle. The noise is from the fuel injectors firing (one injector per deceleration and not always the same injector) and is a normal function of the engine and ... , Chevy / GMC Duramax 04.5-05 LLY Forum. 04.5-05 LLY Duramax Powertrain ... If it sounds like a really loud ticking noise then you might check this out:, Rhythmic ticking noise: A rhythmic ticking noise during deceleration may be present. The noise is usually more pronounced from the passenger side of the vehicle but may be evident in other positions. The source of the noise is from the fuel injectors pulsing and this should be considered a normal characteristic with no service …, it doesnt sound normal to me. That isn't the normal duramax ticking sound. My 2021 l5p ticks but it's not in time with the rpm of the motor and it's not coming from the engine compartment like your video shows ... A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. Come join the discussion about …, Ticking noise. Jump to Latest Follow ... Is it normal for these engines to make a rattling lifter noise? I grew up around semi trucks but this is the first Diesel that I have owned. The noise is generally noticable when accelerating. Sounds like gas engine lifter noise. ... Hot rodding duramax trucks since 2004., The noise is not consistent though. It can tick twice then pause, then tick half a dozen times then pause,..then sometimes it stops altogether. It’s almost like the sound of and old style radiator heater that’s hammering from warm condensation in cold pipes. Do you know what is actually causing this sound on your truck?, Apr 4, 2018 · 136 posts · Joined 2013. #1 · Apr 4, 2018. My truck is right at 200,00 miles with all original drivetrain components. It has started making a clicking/ticking sound that can be heard in the cab pretty good and once window is rolled down, it is even louder. It sounds like it is coming from the rear end or bed area. , New2diesel2003. 316 posts · Joined 2019. #4 · Nov 17, 2020. Try a search of “fuel knock” see if it matches your sound and symptoms ; there is also an issue with some harnesses that if you search “ice pic fix” you can see if that matches your symptoms. But, You really need codes read; most auto parts store will do it for free even my ..., Learn about different types of ticks, and how to avoid and remove them. Trusted Health Information from the National Institutes of Health As people spend more time outdoors, so do ..., My 2023 has a ticking sound that is not the DEF injection tick, it is not a ticking or sound I have heard with modern diesels. I have been aware of that DEF tick tick sound for years with many different diesel trucks. This is an odd ticking that speeds up on acceleration as well as deceleration when downshifting relates to RPM advances., I had a ticking sound coming from the bell housing and it ended up being a couple of torque converter bolts that backed out and wedged in a slot behind the drive plate. ... A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. Come join the discussion about modifications, towing, classifieds, …, 1. Low Oil Level. Most often, the ticking is caused by a low oil level and will go away as soon as the system is topped off. When the engine doesn’t have the right amount of oil, pressure drops and ticking begins. Ticking might intensify as you accelerate or push the car harder., I know it’s an old thread, but the L5P in the 2020 is the noisiest, most unpleasant Duramax to date. The thumping, ticking, screeching, and what I’m assuming is injector knock, is almost Unbearable. Been in 3 different 2020’s and besides when mine melted down a dpf, I’ve yet to hear a quieter Dmax from factory., Jan 16, 2019 · 4x4'nOLDDUDE. 147 posts · Joined 2017. #11 · Jan 20, 2019 (Edited) Possibly the "ticking" noise that you hear, is the fuel injectors opening/closing. Pop-off pressures are (don't quote me on this) around 1300-1700lbs. for most diesel engines IIRC, so they can get a little noisy, especially when it's cold out. , The noise could be described as an irregular ticking or clacking sound like random typing on a mechanical typewriter. This condition has been present in diesel engines produced for the last 20 or more years. The overall noise reduction in engines produced today makes this noise seem new when in fact it was masked by other noises in the past., Thumping or knocking noise coming from what sounds like the rear of the engine. 2020-2021 6.6L 403 CID L5P #PIP5711A Duramax warm engine idle knock noise. Characteristic noise being amplified by the transmission bell housing. This noise has no short or long term effects on the engine., For the "04" model year LLY engine, verify the vehicle has the updated ECM calibration for Engine Combustion knock. For diagnostic purposes advise using 1 - 2 tankfuls of a name brand / different source of diesel fuel to determine if the concern is caused by a fuel quality issue." The ping/tick/whatever is not only at low rpm., Duramax Engine LLY 2004.5 to 2005. In terms of LLY injector problems, GM had sorted out the internal failures with the 2004 ½ redesign, but the LLY Duramax would occasionally exhibit a trouble code for the injectors, but in most cases it turned out to be an issue with the injector harness rubbing through and causing a short or open in the wiring., I have a ticking sound in my Duramax that is getting louder and louder. It is reminiscent of a bad lifter and gets louder under load. It occasionally gets quieter after it sits hot for a few minutes and I restart. Answered in 2 minutes by: GM Mechanic: GM Tech (Cam) GM Tech (Cam) : Hello, I'm Cam. Please include all the details about your issue ..., The truck is a 2006 2500HD with LBZ Duramax and 6-speed Allison, <19,000 miles. The drivetrain has been making what I would describe as a chorus of LOUD cracking, snapping, popping and ticking sounds during cold and warm starts when the ambient temperature is about 65*F and higher. It doesn't make the noise every cold / warm start but it does ..., 2020 6.6 duramax has a 5 year/100,000 mile powertrain warranty. 2020 truck has 8000 miles. At least see what dealer says. 2020 6.6L is rpo code is L5P. 2020 LM2 rpo code is the 3.0L. 2023 LZO CC std box 4x4. previous: 2021 LM2 CC std box 4x4 ; '18 2500 L5P CCSB 4x4; '11 LML, '10 LMM and 04.5 LLY. Like., 164 posts · Joined 2017. #4 · Oct 6, 2021. Probably the DEF injector or the coveted DURAMAX tick. Both normal. These new diesels are so quiet now that you can hear all the weird stuff that has always made noise but was drowned out by engine rattle. New Ride: 2020 GMC 2500 CCLB DMAX. Old Ride: 2004 Chevy 2500 CCSB DMAX.