Collection: 2004.5-2005 Duramax LLY Tune Files

6.6L Duramax LLY Tune Files

Calibrated tune files for the 2004.5–2005 GM 6.6L Duramax LLY. A supported device runs the file; no send-in is required for EZ Lynk. Every part is matched to your truck and the rest of your build.

Tune Files

Dieselr-calibrated ECM and TCM tune files matched to your platform and transmission, plus GDP and Chaos Custom Tuning calibrations. A device runs the file; no send-in is required for EZ Lynk.

Compatibility

Organized by confirmed fitment for the 2004.5–2005 GM 6.6L Duramax LLY.

FAQ

What device do I need to run these tunes?
HP Tuners MPVI4, EFI Live, depending on the file.

What's the difference between an ECM and TCM tune?
An ECM tune controls engine fueling and power; a TCM tune calibrates the transmission. Many builds use both.