Will the fault code reappear after clearing it?
2 Answers
Generally, the fault code will not reappear after clearing it. Below is a detailed introduction to automotive fault codes: 1. Meaning: Indicates the monitored fault system. P stands for Powertrain; B stands for Body; C stands for Chassis; U stands for Network or Data Communication Transmission System fault code. 2. The first digit: Indicates whether it is a generic code (applicable to all vehicle manufacturers) or a manufacturer-specific code. For example: 0 refers to a generic code, while 1 refers to a manufacturer-specific code. General Motors in the United States, for instance, has specific numeric type codes to assist in diagnosing vehicle technical conditions. 3. The second digit: Specifies the type of affected fault system, with numbers ranging from 1-7: 1 for Fuel and Air Metering System; 2 for Fuel and Air Metering System (specifically for injection system circuit malfunction); 3 for Ignition System or Misfire Monitoring System; 4 for Auxiliary Emission System; 5 for Vehicle Speed Control and Idle Control System; 6 for Computer Output Circuit System; 7 for Transmission.
I've been driving for over a decade and dealt with many trouble codes. Whether they reappear after clearing mainly depends on the root cause. If it's a temporary issue, like a sensor covered in dust or a loose wiring connection, the code won't return after cleaning or securing the connector. But if a component is genuinely damaged, such as a completely failed sensor or engine component failure, the code will definitely reappear after clearing. This is very common. I suggest not just clearing the code but using diagnostic tools to check the specific trouble code and fix the underlying issue. If a warning light comes on while driving and is ignored, a minor issue could escalate into a major problem, even affecting safety. During maintenance, pay extra attention to the electrical system, especially in older cars where wiring is prone to aging. Regular cleaning and maintenance can help prevent such issues.
