Detroit Diesel DD15 engines are tough—but when they throw a check engine light or active fault codes, it can slow you down fast. If you're seeing codes like SPN 520372 FMI 16 or SPN 4364, you don’t need to pay the dealer to clear them.

Here’s how to clear fault codes on a DD15 using a diesel laptop scanner.

🔧 What You’ll Need:

• Our Diesel Laptop

• RP1210-compatible adapter (e.g., Nexiq USB-Link 2/3)

• Your truck's ignition turned on, engine off

🔄 Step-by-Step: Clear DD15 Fault Codes

1. Connect your adapter to the 9-pin port under your dash

2. Open DDDL and allow it to detect your ECM

3. Go to the “Fault Codes” section

4. Review Active and Inactive fault codes

5. Fix the physical issue (if needed)—like low DEF or a loose sensor

6. Select the codes and click “Clear Codes”

7. Power cycle the ignition to verify the light is gone

⚠️ Important:

Some fault codes won’t clear unless the issue is fixed and a regen or system reset is performed. Always check for root causes before clearing codes.

💡 Tip:

If you're tired of DDDL being slow or hard to install, consider using DieselScan Pro—it connects to DD15 engines with easy code reading, clearing, and regen capability.

👉 Need a scanner that works with Detroit engines? Click here to shop now