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Understanding DTCs
A
Appendix A – Understanding DTCs
Diagnostic Trouble Code (DTC) Formats
DTCs are used to help determine the cause of a problem or problems with a
vehicle.
OBD II Format Codes
OBD II DTCs consist of a five-digit alphanumeric code.
The DTCs format and general code types are shown below.
ABS Codes are typically chassis (Cxxxx) codes.
Within each category (Powertrain, Chassis, Body and Network) of DTCs there
are assigned ranges for different vehicle systems.
C0023
Left Front Wheel
Speed Sensor Circuit
Malfunction
Current
1 of 3
ABS
Example:
P0101 - Mass or Volume Air Flow Circuit Range/Performance Problem
C 0 1 0 1
Vehicle Specific System
Powertrain Codes
P0xxx - Generic (SAE)
P1xxx - Manufacturer Specific
P2xxx - Generic (SAE)
P30xx-P33xx - Manufacturer Spe-
cific
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
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