In SAE fault codes, the second numeric position identifies what?

• A. Number of fault occurrences
• B. Type of sensor circuit
• C. Message identification
• D. Type of circuit failure

Answer: (D)

In SAE fault codes, the characters are organized to quickly convey where and what the problem is. The second numeric position is the part that tells you the kind of circuit fault involved. That digit classifies the nature of the electrical issue in the circuit—things like a wiring/open circuit condition, a short to voltage, a short to ground, or another circuit integrity problem. The remaining digits identify the specific subsystem and the exact fault condition within that circuit. So, the second numeric position is all about the type of circuit failure, not how many times it occurred, nor the particular sensor, nor a message ID.