OBD-II
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A Diagnostic Trouble Code (DTC) consists of five digits, having the following structure.
First digit structure is:
- Pxxxx for powertrain
- Bxxxx for body
- Cxxxx for chassis
- Uxxxx for future systems
Second digit structure is:
- P0xxx Government required codes
- P1xxx Manufacturer codes for additional emission system function; not required but reported to the government
Third digit structure is:
- Px1xx measurement of air and fuel
- Px2xx measurement of air and fuel
- Px3xx ignition system
- Px4xx additional emission control
- Px5xx speed and idle regulation
- Px6xx computer and output signals
- Px7xx transmission
- Px8xx transmission
- Px9xx control modules, input and output signals
The fourth and fifth digits designate the individual components and systems.
Full list of OBD-II trouble codes