The Detroit Diesel DD15 (2021-2022) is one of the most reliable heavy-duty engines, powering Freightliner and Western Star trucks with enhanced fuel economy, durability, and emissions control. Whether you’re a fleet manager, diesel technician, or truck owner, having access to fault codes, wiring diagrams, and repair manuals is essential for efficient troubleshooting.

In this guide, we provide a comprehensive list of DD15 Gen 5 fault codes, along with links to detailed repair instructions, parts cross-references, and labor time estimates inside Diesel Repair. Stay ahead of breakdowns and keep your DD15 engine running at peak performance!

Review the comprehensive list of fault codes for the 2023 Detroit Diesel DD15 Gen 5. You can view detailed repair information, for free, on every one of these fault codes on the Diesel Repair App.