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

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.

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Why This Happens

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

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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.

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How to Avoid It Before It Happens

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