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DESCRIPTION
ABOUT FAULT CODES
The OBD II system stores fault codes (Diagnostic Trouble
Codes, DTC) in the vehicle’s computer system. The fault
codes provide information on the type of fault and
where and in which conditions the fault occurred, which
simplies fault tracing and correction. The OBD II codes
consist of a 5 character alphanumeric string. The rst
character is a letter that indicates which control system
has caused the fault. The following four characters are
digits that provide supplementary information on where
and in which conditions the fault code was generated.
See example below.
Fault code: P0520
Pos. Category Description
P System
B = Body
C = Chassis
P = Powertrain
U = Network
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