GM E42 ECM Unlock Service (L5P, Global B)

Tune your 2024-2025 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. 

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

Upon purchasing you will be sent a label from your shipping address to HP Tuners (If you DO NOT use our label then your ECM may be lost)