DTC Example
P 0 5 2 0
Systems
B = Body
C = Chassis
P = Powertrain
U = Network
Last two digits identify individual
component within the system
Code Type
Generic (SAE):
P0
B0
C0
U0
Manufacturer Specific:
P1, P2
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 emissions controls
5 = Vehicle speed control and idle controls
6 = Computer output circuits
7 = Transmission controls
Figure 1-2: Explanation of a diagnostic trouble code.
2.3 Location of the Data Link Connector (DLC)
The DLC (Data Link Connector or Diagnostic Link Connector) is the
standardized 16-cavity connector where diagnostic scan tools interface
with the vehicle's on-board computer. The DLC is usually located 12
inches from the center of the instrument panel (dash), under or around the
driver's side for most vehicles. If the Data Link Connector is not located
under the dashboard, a label should be there revealing its location. For
some Asian and European vehicles, the DLC is located behind the ashtray
and the ashtray must be removed to access the connector. If the DLC
cannot be found, refer to the vehicle's service manual for the location.
Figure 1-3: The DLC connector (left) can be found in the area of
the car interior seen at right (black arrow).
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