This is an unlocked ECM only, not a tune service.
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 HPTuners RTD or MPVI3 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.
Shipping address for send-in services: HP Tuners [ATT: GM E42 ECM Service (L5P, Global B)], 700 Eastwood Ln, Buffalo Grove, IL 60089
ECMs with broken “LOCKING” tabs or connectors WILL NOT be accepted for upgrades.
Custom Tuning Now Available for Latest Gen L5P Duramax (E42 ECM)
HP Tuners is proud to offer the industry’s first custom tuning and diagnostics solution for the latest generation L5P Duramax platform, supporting the following models:
- 2024-2025 Chevrolet Silverado 2500/3500 6.6L L5P Duramax (Diesel)
- 2024-2025 GMC Sierra 2500/3500 6.6L L5P Duramax (Diesel)
IMPORTANT NOTE: If you own a 2017-2023 Silverado/Sierra 2500/3500 6.6L L5P Duramax, you require the GM E41 ECM Service (L5P) instead. This service is only for 2024-2025 models (the latest generation L5P) with the E42 ECM.
In order to start tuning, your truck requires this one-time, send-in upgrade service to upgrade the E42 ECM for custom tuning using our VCM Suite software. Spare ECMs will NOT BE ACCEPTED, no exceptions. Only the original ECM from your vehicle is acceptable for this service.
This means your E42 ECM must be removed from your truck and shipped to HP Tuners’ headquarters for servicing. This process takes 3-5 business days to complete (not including shipping).
Everything you need to tune your GM E42 ECM (L5P) vehicle with HP Tuners:
- Purchase this upgrade service to upgrade your E42 ECM for tuning.
- Purchase a tune file & device & credits