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EN
3. 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 is intended to provide you with a guide as to where a fault might be occurring within
a vehicle. OBDII Diagnostic Trouble Codes consist of a vedigit alphanumeric code. The rst
character, a letter, identi es which control system sets the code. The second character, a
number, 0-3; other three characters, a hex character, 0-9 or A-F 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:
DTC Example
P0201
Systems
P
=Powertrai
B
=Body
C
=Chassis
U
=Network
ldentifies what section of the
system is malfunctioning
Code Type
0
- Generic(SAE)
1
- Manufacturer Specic
2
- Generic ('P”Codes) and
Manufacturer
Specic ("B”,“C”and
“U”Codes)
3
- Includes both Generic
and Manufacturer
Specic Codes
Sub-systems
Identifies the system where the
problem is located.“P”Code systems
are listed below.“B”,“C”and“U”Code
system will vary.
0 - Fuel and air metering; Auxiliary
emlssion controls
1 - Fuel and air metering
2 - Fuel and air metering (injector
circuit malfunction only)
3 - Ignition system or misre
4 - Auxiliary emission control system
5 - Vehicle speed control and idl
control system
6 - Computer output circuits
7 - Transmission
8 - Transmission
9 - Transmission
A - Hybrid Propulsion
B - Hybrid Propulsion
C - Hybrid Propulsion
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