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2.2 Diagnostic Trouble Codes (DTCs)
OBD II DTCs are codes that are stored by the vehicles' On-
Board Diagnostic system in response to a problem found
in the vehicle. These codes identify a particular problem
area and are intended to provide you with a guide as to
where a fault might be occurring within a vehicle.
OBD II DTCs consists of a five-digit alphanumeric code.
The first character, a letter, identifies which control system
sets the code. The other four characters, all numbers, provide
additional information on where the DTC originated and
the operating conditions that caused it to set. Here below
is an example to illustrate the structure of the digits:
malfunctioning
section of the
B=Body
C=Chassis
P=Powertrain
U=Network
Generic (SAE):
P0, P2, P34-P39
B0, B3
C0, C3
U0, U3.
Manufacturer Specific:
P1, P30-p33
B1, B2
C1, C2
U1, U2
1= Fuel and Air Metering
2= Fuel and Air Metering
3= Ignition System or Engine Misfire
4= Auxiliary Emission Controls
5= Vehicle Speed Control and Idle
Controls
6= Computer Output Circuits
7= Transmission Controls
8= Transmission Controls
DTC Example
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