If the computer recognizes a condition that is not correct, it records a:

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When the computer recognizes a condition that is not correct, it records a diagnostic trouble code (DTC) which helps identify the problem and eventually fix it. Soft codes are temporary and disappear once the issue is resolved, history codes indicate that there was a problem in the past but it has been fixed, and continuous memory codes are stored in the computer's memory even after the vehicle has been turned off. However, only diagnostic trouble codes are specifically recorded when the computer detects a fault or issue.

If the Computer Recognizes a Condition That Is Not Correct