OBD-II

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