Sierra 1500 2WD V8-5.3L Hybrid (2004)
Conditions for Setting the DTC occur, the PCM executes the Action Taken When the DTC Sets. Some DTCs alert the driver via the MIL or a
message. Other DTCs do not trigger a driver warning, but are stored in memory. The PCM also saves data and input parameters when most DTCs are
set. This data is stored in the Freeze Frame and/or Failure Records.
The DTCs are categorized by type. The DTC type is determined by the MIL operation and the manner in which the fault data is stored when a
particular DTC fails. In some cases there may be exceptions to this structure. Therefore, when diagnosing the system it is important to read the Action
Taken When the DTC Sets and the Conditions for Clearing the DTC in the supporting text.
There are different types of DTCs and different actions taken when the DTCs set. Refer to Diagnostic Trouble Code (DTC) Type Definitions for a
description of the general characteristics of each DTC type.
DTC STATUS
When the scan tool displays a DTC, the status of the DTC is also displayed. The following DTC statuses are indicated only when they apply to the
DTC that is set.
Fail This Ign. (Fail This Ignition): Indicates that this DTC failed during the present ignition cycle.
Last Test Fail: Indicates that this DTC failed the last time the test ran. The last test may have run during a previous ignition cycle if an A or B type
DTC is displayed. For type C DTCs, the last failure must have occurred during the current ignition cycle to appear as Last Test Fail.
MIL Request: Indicates that this DTC is currently requesting the MIL. This selection will report type B DTCs only when they have requested the
MIL (failed twice).
Test Fail SCC (Test Failed Since Code Clear): Indicates that this DTC that has reported a failure since the last time DTCs were cleared.
History: Indicates that the DTC is stored in the PCM History memory. Type B DTCs will not appear in History until they have requested the MIL
(failed twice). History will be displayed for all type A DTCs and type B DTCs (which have requested the MIL) that have failed within the last 40
warm-up cycles. Type C DTCs that have failed within the last 40 warm-up cycles will also appear in History.
Not Run SCC (Not Run Since Code Clear): DTCs will be listed in this category if the diagnostic has not run since DTCs were last cleared. This
status is not included with the DTC display since the DTC can not be set if the diagnostic has not run. This information is displayed when DTC Info is
requested using the scan tool.
