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LAUNCH X-431 V V4.0 User Manual
19
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. DO NOT
replace parts based only on DTCs without first consulting the vehicle’s service
manual for proper testing procedures for that particular system, circuit or
component.
OBD II Diagnostic Trouble Codes consist of a five-digit alphanumeric code.
• The 1st character is a letter (B, C, P or U). It identifies the “main system”
where the fault occurred (Body, Chassis, Powertrain, or Network).
• The 2nd character is a numeric digit (0 thru 3). It identifies the “type” of code
(Generic or Manufacturer-Specific).
Notes:
• Generic DTCs are codes that are used by all vehicle manufacturers. The standards
for generic DTCs, as well as their definitions, are set by the Society of
Automotive Engineers (SAE).
• Manufacturer-Specific DTCs are codes that are controlled by the vehicle
manufacturers. The Federal Government does not require vehicle manufacturers
to go beyond the standardized generic DTCs in order to comply with the new
OBD II emissions standards. However, manufacturers are free to expand beyond
the standardized codes to make their systems easier to diagnose.
• The 3rd character is a letter or a numeric digit (0 thru 9, A thru F). It identifies
the specific system or sub-system where the problem is located.
• The 4th and 5th characters are letters or numeric digits (0 thru 9, A thru F).
They identify the section of the system that is malfunctioning.
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