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Understanding Diagnostic Trouble Codes (DTCs) for Commercial Trucks

Understanding Diagnostic Trouble Codes (DTCs) for Commercial Trucks

by Antonio Zimeri | Jun 15, 2022 | Diesel Laptops, Diesel Repair, Repair Guides

Diagnostic trouble codes, also known as DTCs, are alerts from your truck’s electronic control modules (ECMs) that an issue exists. When a DTC becomes “active”, an indicator in your dash will illuminate so that the driver is aware. This light can look different...

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