Diagnostic Trouble Code (DTC) Type Definitions

Diagnostic Trouble Code (DTC) Type Definitions

Emissions Related DTCs

Action Taken When the DTC Sets - Type A

The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.

Action Taken When the DTC Sets - Type B

The control module illuminates the MIL on the second consecutive ignition cycle that the diagnostic runs and fails.

Conditions for Clearing the MIL/DTC - Type A or Type B
* The control module turns OFF the MIL after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
* A current DTC Last Test Failed clears when the diagnostic runs and passes.
* Use a scan tool in order to clear the MIL and the DTC.

Non-Emissions Related DTCs

Action Taken When the DTC Sets - Type C
* The control module stores the DTC information into memory when the diagnostic runs and fails.
* The MIL will not illuminate.
* The Service Vehicle Soon indicator on the instrument panel may illuminate.

Action Taken When the DTC Sets - Type D
* The control module stores the DTC information into memory when the diagnostic runs and fails.
* The MIL will not illuminate.

Conditions for Clearing the DTC - Type C or Type D
* A last test failed, or current DTC, clears when the diagnostic runs and passes.
* Use a scan tool in order to clear the DTC.