What is SPN 5245 (Cummins) & How to Solve It?

Learn what SPN 5245 (Cummins) means, its causes, and how to fix it. Follow our simple guide to resolve the issue and get your equipment back in action.

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Table of Content

What is SPN 5245 (Cummins):

This Cummins fault code is a system-level warning, often tied to aftertreatment performance, triggering a warning light or derate.

Why This Happens

  • Unresolved emission-related fault codes.
  • Failed regen attempts or skipped regen cycles.
  • DEF system unable to maintain dosing.

How to Fix It

  1. Review all active and inactive emissions fault codes.
  2. Resolve root cause before clearing this system warning.
  3. Perform a successful regeneration.
  4. Use Insite or Cummins software to reset status once issues are resolved.

How to Avoid It Before It Happens

  1. Perform full regen cycles without interruption.
  2. Keep DEF tank full and fluid quality high.

Fault Codes You’ll Often Find

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