HP Tuners GM E42 ECM 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.

This means your E42 ECM must be removed from your truck and shipped to HP Tuners’ headquarters for servicing.

Average turn around for unlock is 2-3 business days. 

Cost to ship to HP is at the purchasers expense and choice of level of service. Return shipping is included in the cost. 

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

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.