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Do I need to send the old one back GM Genuine ACDelco ECM (2004.5-05) 6.6L Duramax LLY (NEW)
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Open Jun 24, 2026 - 04:08 AM
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GM Genuine ACDelco ECM (2004.5-05) 6.6L Duramax LLY (NEW)
New GM Genuine ACDelco ECM for 2004.5–05 6.6L Duramax LLY—OE engine control, drop-in replacement; VIN programmed.
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