06/05/2025
Say goodbye to cables, delays, and downtime.
You can now upgrade your L5P/L5D directly through the OBDII port.
2018-2023 L5P/L5D Upgrade
HP Tuner just made tuning your 6.6L Duramax easier than ever.
If you own a 2018–2023 Silverado or Sierra HD with the 6.6L Duramax and E41 ECM, you no longer need to send in your module or use an upgrade cable to get it ready for tuning. HP Tuners now supports direct OBDII upgrades, letting you upgrade and license your ECM right from your driveway!
GET STARTED TUNING YOUR L5P/L5D
đź“‘ All You Need Is:
The latest VCM Suite Beta.
An MPVI3 device.
Just (6) Universal Credits to license ($300 total) —reduced from (8) Universal Credits previously, saving you $100!
đźš— Impacted Models:
2018–2023 Chevy Silverado / GMC Sierra 2500–3500 (L5P)
2019–2023 Chevy Silverado / GMC Sierra 4500–6500 (L5D)
âś… No more controller removal
âś… No more shipping delays
âś… Significantly faster read/write times
âś… Full access to tuning, diagnostics, and data logging
And if you have a 2017 or early 2018 model? The GM E41 ECM Upgrade Kit is still available—and now just $199.99 (was $349.99).
OBDII E41 Direct Upgrade
🔍 Why Tune Your Diesel Truck?
This is the fastest, most affordable way to get your Duramax tuned with HP Tuners. Whether you're after more power, better drivability, or advanced diagnostics, it all starts right here.
