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Home >> GMC >> 2000 >> Yukon Denali >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Self-Diagnostics - Gasoline - 4.8L, 5.3L & 6.0L >> Diagnostic Tests >> DTC P0602: Control Module Not Programmed >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Flash PCM with current software. If DTC resets, go to next step. If DTC does not reset, go to step  5.
  3. Verify that test equipment used is operating properly and that all connections are clean and tight. Attempt to flash PCM again. If DTC resets, go to next step. If DTC does not reset, go to step  5.
  4. Replace PCM. Program replacement PCM using required equipment. After repair is completed, go to next step.
  5. Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step  2.
  6. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test.
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