What is SPN 5245 & How to Solve It?

What is SPN 5245:

SPN 5245 is a general engine warning without a defined FMI. It’s often triggered by the ECM when it detects multiple or unknown abnormal conditions that don’t map to a specific fault.

This code usually appears alongside other SPN/FMI codes and acts as a system-level warning.

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Why This Happens

• Multiple fault codes triggering engine derate.
• Abnormal sensor behavior without pinpoint source.
• Data mismatches between modules.
• Internal ECM processing issue or timeout.
• Low system voltage during startup or operation.

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How to Fix It

1. Scan for other fault codes and address root causes first.
2. Check ECM power and ground connections.
3. Review communication status of all key modules (aftertreatment, VECU, transmission).
4. Clear codes and monitor to see if SPN 5245 returns without others.
5. If the issue persists alone, update ECM software.

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How to Avoid It Before It Happens

1. Resolve underlying faults quickly to avoid system-level errors.
2. Maintain battery health and voltage stability.
3. Ensure all control modules are running up-to-date software.
4. Watch for clusters of minor codes that may lead to SPN 5245.