There are two available options to calibrate, log, and scan via your vehicle’s OBDII port—Upgrade or Purchase. With either choice, you receive an E41 ECM that is fully compatible and ready to tune with the MPVI2 or newer device and VCM Suite software.

Conveniently upgrade your E41 ECM, found in the 2017+ Chevy Silverado and GMC Sierra 2500/3500 6.6L Duramax trucks (L5P and L5D applications), without removing it from the vehicle. Upgrade your E41 ECM in 20 minutes or less!

You have now successfully unlocked your GM E41 controller! However, your truck is still STOCK! It is now time to send the Stock Read and INFO log into your tuner.

The ECM on the L5P is extremely secure, but there are a few methods that allow you to unlock. This article will give a rundown on the methods, helping you decide which is best for your application!

Conveniently upgrade your E41 ECM, found in the 2017+ Chevy Silverado and GMC Sierra 2500/3500 6.6L Duramax trucks (L5P and L5D applications), without removing it from the vehicle. Upgrade your E41 ECM in 20 minutes or less!

Upgrade your existing E41 ECM without having to trade it in or purchase a new one. This option offers a direct servicing of your current ECM. You send it in, we get it ready for tuning, and send it back.

Conveniently upgrade your E41 ECM, found in the 2017+ Chevy Silverado and GMC Sierra 2500/3500 6.6L Duramax trucks (L5P and L5D applications), without removing it from the vehicle. Upgrade your E41 ECM in 20 minutes or less!

Custom calibrations, data logging, and scanning are now fully functional in just a few quick and simple steps—no need for Immobilizer Relearn, Crank Relearn, or Replace ECM Function. Shops will also experience the fastest E41 unlock and flash times in the industryؙ—7 minutes for unlock and 6 minutes for write time!

GM E41 ECM Services (L5P) is backordered and will ship as soon as it is back in stock. ZackTuned offers specialized L5P ECM tuning services for 2017+ Chevrolet Silverado and GMC Sierra 2500/3500 6.6L Duramax models.