OBD2 Code Guide
OBD-II codes consist of five characters, each with specific meanings.
The first character denotes the system:
P (Powertrain): Codes related to the engine and transmission.
B (Body): Codes related to vehicle body systems such as airbags and electric windows.
C (Chassis): Codes concerning chassis systems like ABS and suspension.
U (Network): Codes related to in-vehicle communication systems like CAN-Bus errors.
Each code structure follows:
1st Character (System): P, B, C, or U.
2nd Character (Manufacturer-specific or generic code): 0, 1, 2, or 3 (0 and 2 are generic, 1 and 3 are manufacturer-specific).
3rd Character (Subsystem): Specifies which part of the system (e.g., fuel, ignition, transmission).
4th and 5th Characters (Specific error): Describe the exact nature of the fault.
For instance:
P0300: Random/Multiple Cylinder Misfire Detected.
B1234: Manufacturer-specific body code, such as Airbag Circuit Disabling Error.
C0561: Chassis Control Module Error.
U0100: CAN-Bus Communication Error with Engine Control Module (ECM/PCM).
Understanding these codes correctly is essential for pinpointing issues and performing accurate repairs on vehicles.
