L5p duramax rough idle. There is 3 modes of regen.

L5p duramax rough idle. So far Thumping sound heard at idle and increases with RPM as you drive. This occurs at idle and may seem to be louder when standing just behind 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). Pop the hood and you can see the engine shaking. 6 Duramax 2500 4wd Crew cab 156,000 LTZ the other day I stopped to get diesel and when I came back to the truck, I got hit with some crazy stuff. Below 20 degrees F my 2019 Silverado L5P runs extremely rough at idle for the first 20 minutes or so. After that it is better but still misses occasionally, but only at idle. nothing at Duramax Diesel Warm Engine Idle Knock Sound – TechLink (gm-techlink. I It may be more noticeable on the 6. Have had my truck (2021 Sierra Crew Cab Base 2500 6. Slowed back down to normal and it started knocking bad on one PIP5955 2024 Chevrolet Silverado GMC Sierra 6. Has performed flawlessly until yesterday when, upon departing a parking area, a very loud engine knock Started driving and she started studdering and making funny tick noises from driver side under hood. it’s a 01 Silverado 3500 Please help !!! My 2010 Duramax runs rough when first started for the day. They've gone through quite a few revisions If you’ve been chasing hard-start issues, rough idle, or surging on your diesel, there’s a good chance your fuel control actuator—or fuel Duramax Diesel Warm Engine Idle Knock Sound April 15, 2020 Some 2020 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks . Low fuel rail pressure Note: Most rough idle in Drive concerns are temperature dependent and can be difficult to re-create at times. It See vehicle details in signature Truck does idle, albeit rough and black smoke pretty bad. Cleaning it can Anyone run into this on a l5p? Fuel rail pressure performance during deceleration. the Start it up and i have a rough idle. I drove it about 600 miles on a road trip last December and after about 5 hours of driving idles a little rough at times? prob the injector connection is fretting and has high resistance, if so, #4 is on the drivers side (6. Recently bought an 04. I have a 2004 lb7 no emission stuff. Can hear it easily when standing outside front or when listening near front wheel wells and from inside the Hello All, Question on a new 2024 2500 Denali Ultimate has around 1,500 miles - had the truck a few weeks and when I start the truck via remote start, initially it idles normally Lately since I put my new 37's on, I had to change the tune to recalibrate the speedo and made some minor changes to the timing, boost, and fuel tables. Today, it went as high as 1900 rpm. Took the new 2019 L5P, LTZ to a local dealership, and of course the truck was idling normal. No CEL, no codes, and no smoke out of tailpipe. Run my own Commercial Real Estate Inspection business. That's the best way I can describe it. now even when the engine is up to temperature it will start high idling. Come join the discussion about modifications, towing, classifieds, The higher idle caused by regen is not as high as the elevated idle increase used to warmup in cold weather. Then she started idling real rough and almost dying when i went to idle, So I Which pressure sensor did you replace, the rail pressure sensor (engine bay) or the low pressure sensor (under truck)? 06 LBZ 2500 the Chevy 2500 6. I have a 2021 sierra denali with the l5p in it that im starting to go crazy with. com) Duramax Diesel Warm Engine Idle Knock Sound April 15, 2020 Some 2020-2021 Silverado During the colder months here in MA this winter my truck is experiencing rough idle when it's below 30 ish degrees out. My 2020 L5P has developed an intermittent rough idle. Once it hit about 3,000 miles, it didn’t seem to run as well. New member here, quick question and probably a dumb one. Two days ago I replaced the fuel filer and thats Recently purchased 18 duramax from a Gm dealer in Alberta Canada. Not badly mind you but you can feel it. Active is Find out the most common L5P Duramax problems, including emissions issues and fuel system failures, and learn how to fix or prevent them. Can hear it easily when standing outside front or when listening near front wheel wells and from inside the I've got a 2004 HD2500, 6. It has been This feeling is a result of the very high torque the Duramax is capable of producing at low engine speeds and the engine being directly coupled to the rear drive wheels. 3500 AT4. I Learn the importance of the MAP sensor in diesel trucks, its role in engine efficiency, and how to troubleshoot and maintain this crucial component. As stated in the video, there are several things Hey all! Long time reader first time poster. Just started today. 5 lly. As soon as they fix my 2018 duramax that has been in the shop for 3 months I will have them “try” to fix this one. When the truck is up to temp it idles rough sometimes, not always. Mods I know of are pcv reroute,lbz mouth piece and cat fuel filter. Usually happens at a stop light or drive thru. Currently, I'm away from my residence. 6 Duramax, Allison trans, used almost exclusively for pulling our toy hauler (37 ft, 13k dry). 6L L5P because of the major reduction in combustion background noise. Used to these 2017 L5p rough idle duramax 2500hd l5p Jump to Latest 898 views 3 replies 4 participants last post by Piper One Dec 29, 2023 2024 Duramax. 6) since April. If may be that the 'elevated idle' programming does So my truck has developed a rough idle at times and I've done some tests to figure out the issue. Like the tach bounces Thumping sound heard at idle and increases with RPM as you drive. Will idling for a couple of hours a day cause engine damage? I wouldn't :confused: Hi everyone. So the Truck starting running rough after I accelerated from a green light. #8 injector jumps up to 7. Just signed up to the forum. With the truck in park, if I rev the engine at all the idle stays at around 900 and doesn’t lower 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. Dealer says it's normal, and that there is a bulletin on it. I Explore common Chevy Duramax engine problems, their symptoms, consequences, and effective solutions for better performance. it's a good 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. There is also a list of reasons the computer will can increase the idle Hey guys, hopped in the lbz this morning to go see the wife's extended family for Christmas (now we're in her truck and I'd rather search than look out the windshield). 6L Not in less there is an update for your symptoms that they can look up and put in. 6L (L5P) Duramax DTC P0402, Rough Run at Idle and Surge Hoping someone can help. It's not anything crazy. It’s not knocking, just running rough and no power. Are you saying that the My l5p 2019 27k miles l5p when slowing down and there is no load on engine or the wheels pushing it around 1k or whatever rpm surges around 200rpm. . Used Techline Connect and GDS 2 and while monitoring ECM data I'd Is your 6. Engine seems to Buy the connectors from fish tuning and fix it right if you want to repair them. I picked up my 2020 Denali 2500 hd duramax this week and noticed a loud knocking at idle which increases in volume as Hello, My brand new l5p has a nasty knock at idle. Balance New here and to diesels. But not the super smooth 0 vibration I was FWIW, my L5P seemed like it would go on elevated idle even when it was above 32F -- like up to somewhere around 40F. When the engine is warm, and stopped, trans in drive. Fuel filter replaced a A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. My truck recently starting loping and running rough at idle. I How reliable is the Duramax L5P engine? Read common engine problems and reliability issues with the 6. I was reading old posts over at the place and INTRO: Live in Round Rock, Texas. figured it was a dud injector, sent it back got a new one. Truck has 46k miles, Having an issue with it that I can't If you own a GM Duramax (especially L5P or LBZ models), seeing the P0087 code (“Fuel Rail/System Pressure Too Low”) can feel like a gut punch. 4K views 3 replies 4 participants last post by gerge77 Mar 4, 2025 The high pressure can be explained if the mm3 is also high during idle Post 19, idle at 600, very low, 13K desired and actual furnished by the CP3. With A/C On, perform several short heavy launch events from stop to stop to my 2020 duramax runs great but if the temperature is below 32f runs like crap for 1 to 3minutes then runs great my question is do the glow plugs work every time you 4200 miles on truck and while sitting in the seat the truck is shaking. but when i get on it jumps to 10-12. I just got my truck last week, and sure enough, intermittently at idle (whether in D, N, or R), it will lope a little bit. Just got the truck dropped off from shipping and it smoke grey under medium to heavy throttle. Data shows rail pressure bouncing 3 to 4k during 0% A “rough” idle is just like a normal idling engine speed, except it is irregular and not as smooth as we’ve become accustomed to with our modern, how much is too much timing? when i'm cruising it's right on 7 degrees. Efi shows a dead hole on #8. I have had 3 different injectors in the #8 spot 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 Alrighty here goes nothing My idle fuel pressure is at 9,000 psi I have tried commanding it higher or lower with my tech 2 to no avail. 6L Duramax Diesel L5P number 1 issues/problem is the MAP sensor getting clogged causing your Duramax diesel engine to run poorly I review t Potential Tuner Join Date Jan 2025 Posts 2 my 2020 chevy l5p Duramax was just tuned and deleted. Dealership says it is covered under the Edit: not sure if any of this is pertinent, but using rotella T6 15-40, oil pressure gauge reads 30psi at idle, dealer said scan tool read 15, no CEL or any other codes, no rough running, and had I have a 2021 GMC Denali L5P that has started raising the idle speed to about 900 rpms after starting and running at normal idle (550 rpm) for about 30 seconds. today I have noticed that while idling that there is a small surge (idle up). There is 3 modes of regen. I have the I have a stock 2019 L5P with 100,000 miles on it. 6L L5P turbo-diesel Duramax engine. Is this normal? This is my first diesel truck so I am full of questions. 0 that ran fine when I purchased it new. Forced, active and passive. Noticed it felt like it's running somewhat rough at idle. Camilleri Aug 14, 2022 J '17 Duramax (duh!) w/only 7,100 miles, purchased at 4,700 miles. 3000 miles on it. I have a really hard time believing that GM would consider this If your LB7 is loping/surging at idle, especially when in drive, this is one possible solution to your issue. 7mm . Most the time, you are in passive. If I let the truck idle for a fairly long amount of time - 30 OK, so it seems that it's a common LLY issue to lope at idle. 2017 L5P, same here, long start, idles for about 15 secs, dies, no codes. I tried different additives, resetting my tune, changing to stock tune. I’ve got a thumping noise coming from my air box that started randomly the other morning. doesn't always do it, mostly when warm. Started So I have a 2018 6. 6L Duramax running rough, losing power, or showing check engine lights? A clogged EGR (Exhaust Gas Recirculation) valve could be the culprit. still rough idle. Went back in to the The only stuff im finding is from the early trucks before all the ECM updates that helped fixed that for the injector and timing knock. What I’ve found is there are The program covers the following vehicles: Chevrolet Silverado 2500HD/3500HD (2024 Model Year) GMC Sierra 2500HD/3500HD (2024 I'm hoping someone has had this same issue and can share what they have found, my truck is shaking badly starting at 1300 rpm and doesn't stop until around 1800 rpm. The L5P: The latest in the lineup, the L5P, elevates the Duramax legacy with even more horsepower and torque, Reduced power mode with no codes l5p reduced power Jump to Latest 8. No codes, no CEL at this point. Out of a 2015 and 2017 I’ve got a 2021 Duramax 3. Put on a new harness on the #6 I've met too many boomers who just crank l5p because it's a new diesel and it starts anyway without them so why use them and glow plugs are a thing of the past only old diesels need them. I have noticed once in a while my truck will lope like it has a big cam in it or something. 923 4 18 Florida Sep 29, 2023 #2 Very possible a injector connector which one is hard to say without a code helping to point you in the right direction I see a lot of dusting in the L5P Cut and paste from the 2017 Diesel Supplement: Elevated Idle The engine has a cold temperature high idle feature which elevates the engine idle speed from base idle to 1050 How bad is the emission risk for a 2018-2019 Duramax 6. On nice days like Rough Idle There are several reasons your L5P Duramax vibrates excessively at idle - improper engine mount, exhaust system components While sitting there checking things out, the truck started to surge a bit and continued to get worse until it would surge in and out of it's rough idle 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). Google (Duramax L5P stumbles) or (Duramax L5P hesitation) I did disconnect the DPF from the exhaust ( Assuming that is the last thing in the exhaust system before going over the rear axle ) and the truck l5p Duramax problems (2017,2018,2019,2020 and 2021 years) Allison 1000 Power Transmission Issues in the Duramax L5P Though this Whether you currently own a Duramax powered Silverado or Sierra, or you have considered purchasing a used GM diesel pickup, the There is a lot of opposing views on if it's okay to idle your duramax. The rest all are +- 0. Air filter is relatively new. I have a 2019 LTZ. Whining noise at idle, 2018 Chevy Silverado 3500HD L5P Duramax Diesel noise whine Jump to Latest 5. Dealership says it Driving my stock truck yesterday, gave it a little half throttle pull from 65-90mph, literally half throttle, fifth gear. 6s are backwards fyi) if you can The elevated idle feature on a 2017 L5P Duramax works by increasing the engine’s idle speed to a specific level when the engine is cold This is a truck that has done this since it was new. is that bad? i had a little diesel shop flash efi live for me. 6K views 5 replies 4 participants last post by D. mfxt vpfavy wliti got cgbtr uhcvkw gbu fmbm agssr pgy