What are the car fault symbols?
1 Answers
Fault codes consist of five characters, with the first being a letter followed by four Arabic numerals. The second character in the fault code indicates the category. Fault codes beginning with 'P0×××' are ISO-standard controlled codes (e.g., P0099), which are the same across all car manufacturers and are predetermined by ISO/ASE. The P0100 series codes relate to fuel and air metering. The P0200 series codes also pertain to fuel and air metering. The P0300 series codes are associated with the ignition system and misfire conditions. The P0400 series codes concern auxiliary emission control systems. The P0500 series codes are related to vehicle speed, idle control systems, and auxiliary inputs. The P0600 series codes involve internal control unit faults or dedicated circuits connecting the control unit with other control modules in a multiplex communication system. The P0700 series codes pertain to transmission control functions. The P0800 series codes also relate to transmission control functions. The last two digits of the code refer to specific subsystems with their own diagnostic procedures. For example, P0115 specifically indicates the engine coolant temperature sensor. Some P0200 and P0300 series codes use the last two digits to identify the specific engine cylinder where the fault was detected. For instance, P0300 indicates multiple cylinder misfires, P0301 indicates a misfire in cylinder 1, P0302 indicates a misfire in cylinder 2, and so on. Another example is P0200, which indicates an open circuit in the fuel injector circuit, P0201 indicates an open circuit in cylinder 1's fuel injector circuit, P0202 indicates an open circuit in cylinder 2's fuel injector circuit, P0203 indicates an open circuit in cylinder 3's fuel injector circuit, P0206 indicates an open circuit in cylinder 6's fuel injector circuit, P0211 indicates an open circuit in cylinder 11's fuel injector circuit, P0212 indicates an open circuit in cylinder 12's fuel injector circuit, etc. Fault codes beginning with 'P1×××' are manufacturer-controlled codes (e.g., P11××, which car manufacturers control for fuel and air flow). These are predetermined by the car manufacturer and may be manufacturer-specific, but they are still standard codes. Fault codes beginning with 'P2×××' are also standard fault codes, falling under standardized (SAE/ISO) categories and specific manufacturer codes. Some are reserved by ISO or SAE, while others are already published fault codes.
