GM E41 ECM Services (L5P) - Upgrade Only

Get your 2017+ 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: Purchase or Upgrade.

Shipping address for send-in E41 ECM service: HP Tuners (ATT: L5P ECM Service), 700 Eastwood Ln, Buffalo Grove, IL 60089

ECMs with broken “LOCKING” tabs or connectors WILL NOT be accepted for upgrades.