Understanding OBD II on My Vehicle

DTC Anatomy

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
	Emissions related. Requests illumination of the MIL after one failed driving cycle. Stores a freeze frame DTC after one failed driving cycle.
Type B
	Emissions related. Sets a Pending Trouble Code after one failed driving cycle. Clears a Pending Trouble Code after one successful driving cycle. Turns on the MIL after two consecutive failed driving cycles. Stores a freeze frame after two consecutive failed driving cycles.

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Posted in: DTC,Grand Livina Check Engine,OBD II