The 2017-2023 L5P Duramax is the strongest factory Duramax yet, and one of the most common platforms we get questions about. Here are the ones that come up most.
How much power can an L5P safely handle?
It depends entirely on supporting mods — injectors, turbo, fuel system, and how the truck is actually driven. That's exactly why tune types exist: an economy or street tune stays well within factory-supported limits, while a wild tune assumes the hardware to back it up.
What transmission does the L5P use?
Earlier L5P trucks (2017-2019) use the 6-speed Allison 1000; 2020-and-newer trucks moved to a 10-speed Allison. Both are calibrated as part of the tune — shift firmness, shift points, and torque management matched to your fueling.
Is EZ Lynk supported on the L5P?
Yes — the L5P is one of the best-supported platforms for EZ Lynk's AutoAgent, which means remote tuning and revisions are realistic without needing an in-person visit for every change.
Can you tune a deleted L5P?
Yes, for trucks where emissions equipment has already been removed. The tune is built around the truck's actual current configuration rather than assuming factory-stock emissions equipment.
What's the most common request for L5P owners?
Honestly, it's split pretty evenly between two things: daily drivers wanting better MPG and smoother shifting, and built trucks wanting a tune that actually matches serious supporting mods instead of a generic file.
Do I need to know my exact mods before reaching out?
No — a rough idea is enough to start the conversation. We'll figure out the right tune type together once we know what the truck's actually running.