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Types of DTC's

There are two categories of DTC's that apply to OBDII. They are listed below with Type A being the more severe.

Type A
  1. Emissions related.
  2. Requests illumination of the MIL after one failed driving cycle.
  3. Stores a freeze frame DTC after one failed driving cycle.

Type B
  1. Emissions related.
  2. Sets a Pending Trouble Code after one failed driving cycle.
  3. Clears a Pending Trouble Code after one successful driving cycle.
  4. Turns on the MIL after two consecutive failed driving cycles.
  5. Stores a freeze frame after two consecutive failed driving cycles.

 

 

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