HPT L5P ECM Upgrade (*Original ECM Required*)

Get your 2017+ Chevrolet Silverado and GMC Sierra 2500/3500 6.6L Duramax ready for tuning with HP Tuners E41 ECM Upgrade service. Upgrade your original E41 ECM for tuning and diagnostics via this send-in, one-time service. Simply send HP Tuners your original E41 ECM and we'll upgrade it for tuning and diagnostics.This Part Fits: Year Make Model Submodel 2021-2022 Chevrolet Silverado 2500 HD Custom 2017-2022 Chevrolet Silverado 2500 HD High Country 2017-2022 Chevrolet Silverado 2500 HD LT 2017-2022 Chevrolet Silverado 2500 HD LTZ 2017-2022 Chevrolet Silverado 2500 HD WT 2017-2022 Chevrolet Silverado 3500 HD High Country 2017-2022 Chevrolet Silverado 3500 HD LT 2017-2022 Chevrolet Silverado 3500 HD LTZ 2017-2022 Chevrolet Silverado 3500 HD WT 2020-2022 GMC Sierra 2500 HD AT4 2017-2021 GMC Sierra 2500 HD Base 2017-2022 GMC Sierra 2500 HD Denali 2022 GMC Sierra 2500 HD Pro 2017-2022 GMC Sierra 2500 HD SLE 2017-2022 GMC Sierra 2500 HD SLT 2020-2022 GMC Sierr