Full Product Manual

2.2 Diagnostic Trouble Codes (DTCs)
OBD II Diagnostic Trouble Codes are codes that are stored
by the on-board computer 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.
These codes provide information as to where the DTC originated
and the operating conditions that caused it to set. See chart below:
DTC Example
P 0 2 0 2
Systems
B=Body
C=Chassis
P=Powertrain
U=Network
Identifying specific
malfunctioning
section of the
systems
Code Type
Generic (SAE):
P0, P2, P34-P39
B0, B3
C0, C3
U0,
U3.
Manufacturer Specific:
P1, P30-p33
B1, B2
C1, C2
U1, U2
Sub-systems
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
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