HP Tuners Model ECM-00-L5P-UGM E41 ECM Services (L5P) - GM E41 ECM Upgrade Get your 2017-2023 Chevrolet Silverado and GMC Sierra 2500/3500 6.6L Duramax ready for tuning! Choose one of...
Get your 2017-2023 Chevrolet Silverado and GMC Sierra 2500/3500 6.6L Duramax ready for tuning! Choose one of two options to upgrade your L5P E41 ECM for tuning: Upgrade.
If you own a 2018-2023 model year, you can upgrade your truck directly via the OBDII port! Find out more.
Shipping address for send-in services: HP Tuners [ATT: GM E41 ECM Service(L5P)], 700 Eastwood Ln, Buffalo Grove, IL 60089. Please respond to your order confirmation email with your tracking number once mailed.
ECMs with broken “LOCKING” tabs or connectors WILL NOT be accepted for upgrades.
