Oct 15, 2025 · L5P Loud vibration when towing up hill larry.hayes.75 Oct 15, 2025 Replies 7 Views 125 Oct 17, 2025

Jul 29, 2021 · Discuss the seventh generation of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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 …

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 …

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 …

Dec 19, 2021 · Hi guys, the check engine light appeared on my truck panel and I used the scanner and it showed this Also I bought an original NOX sensor, I erased the code and …

Mar 27, 2019 · So how hard is it going to be to make an l5d in the new medium duty produce the same power as an l5p? I assume the turbos will need swapped and a tune. Would one be able …

Feb 26, 2018 · I'm newly registered to the site, but have been lingering here for awhile. I recently traded up from a 2015 LML to a new 2018 L5P and wanted to share my observations. With …

Feb 17, 2020 · Anyone run into this on a l5p? Fuel rail pressure performance during deceleration. Data shows rail pressure bouncing 3 to 4k during 0% throttle deceleration. Desired at 10200 …

Mar 21, 2022 · I have a stock 2019 L5P with 100,000 miles on it. I drove it about 600 miles on a road trip last December and after about 5 hours of driving highway speed, I started to notice a …