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Getting Started
2
OBD II Diagnostic Trouble Codes
(DTCs)
J2012 and ISO 15031-6 are standards for all DTCs, established by
the SAE, International Organization for Standardization (ISO) and
other governing bodies.
Codes and definitions assigned by these specifications are
known as Generic OBD II codes.
OBD II requires compliance to these standards for all cars, light
trucks, APVs, MPVs, and SUVs sold in the United States.
Codes not reserved by the SAE are reserved for the
manufacturer and referred to as Manufacturer Specific Codes.
DTCs are used to help determine the cause of a problem or
problems with a vehicle.
DTCs consist of a five-digit alphanumeric code.
The DTCs format and general code types are shown below.
Example:
P0101 - Mass or Volume Air Flow Circuit Range/Performance Problem
P 0 1 0 1
Vehicle Specific System
Powertrain Codes
P0xxx - Generic (SAE)
P1xxx - Manufacturer Specific
P2xxx - Generic (SAE)
P30xx-P33xx - Manufacturer Specific
P34xx-P39xx - Generic (SAE)
Chassis Codes
C0xxx - Generic (SAE)
C1xxx - Manufacturer Specific
C2xxx - Manufacturer Specific
C3xxx - Generic (SAE)
Body Codes
B0xxx - Generic (SAE)
B1xxx - Manufacturer Specific
B2xxx - Manufacturer Specific
B3xxx - Generic (SAE)
Network Communication Codes
U0xxx - Generic (SAE)
U1xxx - Manufacturer Specific
U2xxx - Manufacturer Specific
U3xxx - Generic (SAE)
Specific Fault Designation
Bx - Body
Cx - Chassis
Px - Powertrain
Ux - Network Comm.
x = 0, 1, 2 or 3
Within each category (Powertrain, Chassis, Body and Network) of
DTCs there are assigned ranges for different vehicle systems.
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