GM E42 ECM Service (L5P, Global B) ECM-E42-L5P-U | 2024-2025 6.6L Duramax L5P

HP Tuners is proud to offer the industry’s first custom tuning and diagnostics solution for the latest generation L5P Duramax platform. This service supports the following models:

• 2024–2026 Chevrolet Silverado 2500/3500 6.6L L5P Duramax (Diesel)
• 2024–2026 GMC Sierra 2500/3500 6.6L L5P Duramax (Diesel)
• 2024–2026 GMC Sierra 4500/5500/6500 6.6L L5D Duramax
• 2024–2026 Chevrolet Silverado 4500/5500/6500 6.6L L5D Duramax

Important Note: This service is only for 2024–2025 models (latest generation L5P) equipped with the E42 ECM. Spare ECMs will not be accepted—only the original ECM from your vehicle is eligible for this upgrade.

Service Details

• This is a one-time, send-in service to upgrade your E42 ECM for custom tuning using HP Tuners’ VCM Suite software.
• Your ECM must be removed from your truck and shipped to HP Tuners’ headquarters for servicing.
• Turnaround time is typically up to 7 business days (shipping time not included).

Once upgraded, your E42 ECM will be fully compatible with HP Tuners custom tuning, logging, and diagnostics for the latest L5P/L5D Duramax trucks.