Dec 3, 2025 · L5P Loud vibration when towing up hill larry.hayes.75 Oct 15, 2025 Replies 7 Views 170 Oct 17, 2025

Dec 23, 2024 · I have a 2017 2500HD LT L5P with a "DEF EMPTY" issue which the tank is COMPLETELY FULL. WTFO? The DEF pump was just replaced 5 months ago and has been …

Sep 27, 2024 · It was wrecked, it’s possible the doc or dpf or scr are broke and plugging the exhaust. After driving that first few miles it started plugging all flowing holes up. What’s your maf sensor …

Apr 24, 2025 · I have a 2017 L5P, it’s deleted and tuned. Had a head gasket failure. Ran fan coming in my shop started great, sounded great etc. get the cab back on, plug everything up whole nine, crank …

Jun 10, 2021 · Wondering if any of you l5p gurus have some failure analysis input for me.So this truck came to me with a miss on one cylinder and a pop out of the intake,pulled the valve cover and found …

Sep 7, 2021 · I bought a used 2018 2500HD Duramax L5P and a week after owning got a reduced engine power warning and got it scanned and received the P0191 code and took it back to the …

Dec 22, 2024 · Want to start a thread of how many miles are in your L5p and what serious issues have you had with it. I’ll start 2019 L5p with 109k miles have not had any issues with it so far.

Feb 23, 2023 · I just purchased a 2018 L5P with 184k mi. I have a 'Service Exhaust Fluid System' message; followed by 'See Owner's Manual Now'; then '58 Miles Until 65 mph Max Speed'. I have an …

Oct 6, 2020 · 4000 Kms and the check engine light comes on. Diagnostic says the #8 injector needs to be replaced and 2 others are questionable. Coincidentally met another guy with the same truck …

May 2, 2018 · New 3500 Denali bought new about 2 months ago. It has 1800 miles on it. while getting on the freeway at 35-45 mph relatively light acceleration truck stumbles I cant tell if its engine or …