Duramax L5P Tuning (2017-2021)
Improve the performance of your 2017, 2018, 2019, 2020, or 2021 Duramax L5P.
In 2017 GM introduced the L5P Duramax engine to their 2500 and 3500 pickup vehicles. The L5P boasted significant improvements in engine design over its predecessor, the LML Duramax engine. The L5P Duramax features a redesigned DPF, SCR, DEF and EGR system, a significant increase in OEM power over its predecessor, completely redesigned turbo, and various other engine configuration changes.
L5P Switch on the Fly is now available!
L5P Switch on the Fly is available as of February 24, 2021. It's now the smoothest switch on the fly on the market in that it does not require any additional hardware - you flash your tune right from your steering wheel - watch our video for a demonstration. Prior to this you had to flash each tune in using the MPVI2 from your computer for specific use and then do it again if you wanted to change tunes. If you purchased our L5P Single Tune or All Four Pack, you can upgrade from single to the L5P Switch on the Fly by clicking the links below. here. If you're not upgrading and starting fresh, use the drop down selector at the top of the page, choose your hardware choice, then choose switch on the fly.
- Upgrade to SOTF from Single 2017-19
- Upgrade to SOTF from 4 Pack 2017-19
- Upgrade to SOTF from Single 2020
- Upgrade to SOTF from 4 Pack 2020
L5P ECM Tuning
Delete everything else you have heard about L5P tuning; Motor Ops has you covered for all of your L5P custom tuning needs.
Motor Ops originally offered 4 tunes for the L5P: Our original general tow tune (offered as a single and in our 4 pack) optimizes performance to tow up to the GVWR (Gross Vehicle Weight Rating). A wider torque curve improves drive-ability while towing and adds 90 RWHP and 120 ft-lbs of torque. Now that SOTF is offered for L5P, we have a Light and Heavy Tow in the switchable 5 pack.
Sport Economy and Race tunes are designed for off road use and may be restricted where you live. Sport Economy adds 140 RWHP and 300 ft-lbs torque over factory. Race puts your vehicle near the 600 RWHP 1360 ft-lbs mark. In our new switchable 5 pack,we also offer a Hot Street tune that is a good bridge between our sport and race tunes.
Motor Ops tunes are clean running tunes and, in many cases, produce less smoke output than a factory calibration does. Our tow tunes are proven to have EGTs 100F lower than a factory calibration under load. Our tuning achieves market leading power gains without running high timing rates like many other tuners do; in fact, our tuning is within 2* of the OEM timing maps. All of these things will keep your truck on the road and prevent premature wear or engine failure on your L5P.
You’re looking for a Duramax L5P tuner, and our complete tuning packages include HP tuners MPVI2 hardware, a choice of an L5P ECM exchange or a modified ECM purchase, a CAN Communications harness, and required HP tuners universal credits. Box tuners such as banks tuner (derringer) or edge tuner are cheap options for L5P owners, but after making the investment in your L5P, these box tuners leave a lot on the table in terms of drive-ability, peak power, and reliability. Motor Ops L5P tuning will run smoother, produce more power, have lower exhaust gas temperatures under load, and prove to be more reliable than any box tuner on the market. Don't be penny wise and pound foolish.
We recommend purchasing a modified L5P ECM from us, that ships within 48 hours of order. The ECM swap or exchange requires you to remove your ECM and ship it to HP Tuners. You will wait 3 to 8 weeks for them to ship you back a modified ECM, and during this time, you cannot use your truck.
|Original All Four Tune Pack||Tune||Power Gains RWHP, Torque|
|Tow||+ 90 RWHP, + 120 ft-lbs|
|Sport Economy||+ 140 RWHP, +300 ft-lbs|
|Race||+ 190 RWHP, + 500 ft-lbs|
|Optimized Stock||+15 RWHP, + 10 ft-lbs torque|
|New Switch on the Fly||Heavy Tow||+ 90 RWHP, + 120 ft-lbs|
|Light Tow||+ 110 RWHP, + 200 ft-lbs|
|Sport Economy||+ 140 RWHP, +300 ft-lbs|
|Hot Street||+ 170 RWHP, +400 ft-lbs|
|Race / Max Performance||+ 210 RWHP, + 500 ft-lbs|
L5P TCM Tuning
TCM unlock and transmission tuning is available for the 2017, 2018, and 2019 models. We strongly recommend transmission tuning if you will be using our high performance tunes regularly to avoid premature wear. The L5P Transmission does not handle power above 500 RWHP well without increased line pressure. Our Transmission tuning increases the transmission line pressure which gives the transmission the ability to hold horsepower values up to 600 RWHP. Additionally, the L5P transmission has a calibration that short shifts and keeps the truck a little under the turbo. We extend shift points, refine shift timing, and have redesigned torque converter lockup to improve the drive-ability and response of the vehicle.
TCM unlock is not yet available for the 2020 Duramax L5P because it is paired with a new 10-speed transmission which has a new transmission controller that is not yet supported by HP Tuners. Until it is, we recommend you use our high performance tunes sparingly and not with consistent daily driving. If you are easy on the throttle and not getting too aggressive on the throttle then you can use the race tune but any aggressive driving habits do have the ability to quickly jeopardize the life of the 10 speed transmission. We strongly advise against excessive throttle input at cruising / highway speeds (55 MPH+) as the higher gears in a truck do not have the same holding capacity that the lower gears will have. Linear applied pedal position input instead of going from 15% applied pedal position to 100% applied pedal position in a split second will also help your truck and transmission perform appropriately.
The TCM swap is similar to the ECM swap; we recommend that you purchase the modified T87A TCM from us instead of sending in your OEM TCM and then having your vehicle down for the processing and transit time.
HP Tuners. Why not EFI Live or EZ Lynk for L5P?
We offer custom tuning for the EFI Live and EZ Lynk platforms on a wide variety of vehicles. At this point, HP Tuners offers us the best calibration access for L5P engines which translates into a better performing vehicle for you at a lower price.
What about ECM/TCM Removal, Installation, Dealers?
Using our Modified Purchase, we ship within 48 hours. General knowledge of navigating tuning software is recommended for people installing the tunes and running through HP Tuners installation protocols. However, Motor Ops provides detailed installation instructions and can provide assistance via telephone during our normal hours of operation. We will need a "stock read" from you, and you will always have this bare or bone stock file with your original factory settings. Removing the factory ECM/TCM and installing the HP Tuners Modified ECM / TCM is a very easy process. It can be done with minimal hand tools (10 mm socket and ratchet recommended). Typically the removal and reinstallation of the ECM and TCM takes about 30 minutes on a 2017 to 2019 L5P and about 45 minutes on a 2020 L5P. Many of our customers go to a Motor Ops dealer to have their L5P tuned and have other various performance parts installed. We recommend having someone familiar with tuning software do the installation as it can be a little daunting for someone experimenting with tuning for the first time. Call us and we will recommend a local performance shop if you don't already have one. Motor Ops has over 800 dealers that span across North America, Australia, New Zealand, Central America, and Europe.
What about Warranty work, selling or trading my L5P?
If you need to take your vehicle in for warranty work, we recommend reinstalling your factory ECM and removing any aftermarket parts and reinstalling the factory components. This is why we believe in our purchase rather than exchange of the ECM. If you are going to trade or sell your tuned L5P we recommend calling your dealer or one in the area and getting an idea on what your vehicle value would be if it was tuned and what vehicle value would be if it was stock. Typically dealers are going to give you a much better trade-in value on a vehicle that is completely stock and has the factory ECM installed in it. If you are selling your L5P privately then selling it stock versus tuned really depends on what the local market is calling for. Some quick calls to some used car lots and asking how many diesel pickups they usually have in stock, how quickly they run through them, and if any of them are tuned could provide some great education. Additionally, you can do a quick search through on-line market places, social media, etc. Markets differ quite a bit from area to area and the only right answer is to do some research and figure out what increases your trade-in value or private sale value the most.
Other recommended L5P modifications
We recommend buying the WC Fab 3.5 inch Turbo intake Horn; this product removes a major restriction in the induction system right before the turbo. The outcome is typically lower EGTs, higher power output, and less soot accumulation. We also recommend doing the WC Fab 3 inch intercooler pipe. This is a 1 piece intercooler pipe which reduces the amount of potential boost leak locations and transfers charge air to the intercooler in a better fashion than the factory intercooler pipe does.
Read our Duramax L5P tuning tips blog and contact us by phone for advice before purchasing.
Use the drop down selector at the top of the page to choose your model year and tune selection, and order your Motor Ops L5P tune today! Or call us if you have questions.