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OBD II Diagnostic Trouble Codes (DTCs)
✓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.
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Within each category (Powertrain, Chassis, Body and Network) of
DTCs there are assigned ranges for different vehicle systems.
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