OTR Diagnostics just got another major update. We’ve expanded support to include Detroit Diesel DD13 and DD15 engines for model years 2025 and 2026, giving you full access to dealer-level diagnostics on the newest Detroit platforms.
What this means for Detroit Diesel owners
If you’re running a DD13 or DD15, you can now use OTR Diagnostics to perform the same advanced commands and resets normally reserved for the dealer. This includes:
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Forced DPF and SCR regens when automatic cycles won’t start
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Resetting fault codes and aftertreatment systems after repairs or maintenance
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Monitoring live data such as soot load, DEF quality, NOx sensor readings, and exhaust temps
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Getting real-time repair guidance from OTR Assist, our built-in AI support system
These updates make it easier than ever to handle aftertreatment issues directly from your phone — saving you time, money, and unnecessary shop visits.
Always improving, always up to date
We’re committed to keeping OTR Diagnostics ahead of every new engine release. The 2025–2026 Detroit update continues that promise, ensuring you can diagnose, repair, and reset your truck with confidence as technology evolves.
If you already have OTR Diagnostics, simply update your app and connect your adapter to access the new Detroit Diesel coverage.
[Get started with OTR Diagnostics →]
Note: To take advantage of the new Detroit Diesel 2025–2026 commands, make sure you’re using the OTR Link 2 adapter with firmware version 2.0.1 or newer.
This version unlocks full communication with the latest Detroit ECUs and ensures faster, more stable connections for advanced commands.
New coverage: International A26 engines now supported by OTR Diagnostics