Diagnostic Trouble Code Descriptions
Diagnostic Trouble Code (DTC) Type DefinitionsEmissions Related DTCs
Action Taken When the DTC Sets - Type A
- The engine control module (ECM) illuminates the Malfunction Indicator Lamp (MIL) when the diagnostic runs and fails.
Action Taken When the DTC Sets - Type B
- The ECM illuminates the MIL on the second consecutive driving cycle when the diagnostic runs and fails.
Conditions for Clearing the MIL/DTC - Type A or Type B
- The ECM turns OFF the MIL after 3 consecutive driving cycles when the diagnostic runs and does not fail (12,000 lbs GVW).
- The ECM turns OFF the MIL when the diagnostic runs and does not fail. (Except 12,000 lbs GVW) A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic after the ECM turns OFF the MIL.
- 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 ECM will not illuminate the MIL but illuminates the Service Vehicle Soon (SVS) lamp when the diagnostic runs and fails.
Action Taken When the DTC Sets - Type D
- The ECM will not illuminate the MIL or SVS lamp.
Conditions for Clearing the DTC - Type C or Type D
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic after the ECM turns OFF the SVS lamp. (Type C)
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic. (Type D)
- Use a scan tool in order to clear the SVS lamp and the DTC. (Type C)
- Use a scan tool in order to clear the DTC. (Type D)
ECM Diagnostic Trouble Code (DTC)
