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What is a Permanent Fault Code?

1 Answers

LaMariana

07/29/25 3:06pm

A permanent fault code in a vehicle is a type of malfunction that affects the operation of the equipment and cannot be resolved without taking specific measures to restore normal operation. Permanent fault codes in vehicles cannot be deleted or overwritten unless the manufacturer is contacted, and professional technicians modify the vehicle's onboard computer program to remove the code. In reality, if a car displays a permanent fault code, it is necessary to visit a 4S shop or a professional auto repair shop. There, a technician can connect a diagnostic computer to the vehicle to read the fault code and determine the exact issue. Only by identifying the problem can it be properly repaired. Automotive fault codes are codes generated by the vehicle's ECU (Engine Control Unit) after analyzing a malfunction. When these codes appear, the vehicle has a fault, and the fault indicator light remains illuminated. To fully resolve the issue, a professional diagnostic tool (such as a K81 or laptop) is required to decode and clear the fault—commonly referred to as troubleshooting. Fault codes are categorized into active codes, historical codes, and intermittent codes. Active codes are easy to detect, historical codes refer to previously unresolved faults that were not cleared, while intermittent fault codes are not consistent.

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