GM E42 ECM (Global B) Upgrade Service

Tune your 2024-2026 Silverado/Sierra 2500/3500 with the 6.6L L5P Duramax (E42 ECM) now using HP Tuners’ VCM Suite! This service is required to upgrade the E42 ECM in these diesel trucks for tuning using an MPVI3 or MPVI4 device and VCM Suite.

Note: Spare ECMs will NOT BE ACCEPTED, no exceptions. Only the original ECM from your vehicle is acceptable for this service. 

Have a 2017-2023 model L5P? Check out the GM E41 ECM Service (L5P) instead.

Shipping address for send-in services: HP Tuners [ATT: GM E42 ECM Service (L5P, Global B)], 711 Dartmouth Lane, Buffalo Grove, IL 60089

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