What is CAT Code 4576-3 & How to Solve It?

What is CAT Code 4576-3:

CAT 4576-3 is a high-voltage fault in the aftertreatment injector circuit. The injector is receiving more voltage than it should, which may lead to injector overheating or failure.

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Why This Happens

• Short to power in wiring harness.
• Faulty injector solenoid pulling excess current.
• Overvoltage from alternator or ECM.
• Poor ground path increasing circuit load.

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How to Fix It

1. Inspect wiring and connectors for shorts.
2. Test injector resistance with a multimeter.
3. Replace injector if internal short is detected.
4. Check voltage at injector plug under load.
5. Clear the fault and verify dosing stability.

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How to Avoid It Before It Happens

1. Monitor dosing system voltage during regen.
2. Secure injector wiring from contact with metal parts.
3. Log injector replacements and service life.