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Home >> GMC >> 2000 >> Envoy >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 4.3L >> Diagnostic Tests >> DTC P0602: Control Module Not Programmed >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC SYSTEM CHECK . After performing OBD system check, go to next step.
  2. Flash VCM with correct software. Recheck for DTCs. If this resets, go to next step. if this DTC does not reset, go to step  5.
  3. Ensure equipment being used is functioning properly and that all cable connections are clean and tight. Attempt to flash VCM again. Recheck DTCs. If this DTC resets, go to next step. If this DTC does not reset, go to step  5.
  4. Replace VCM. Program replacement VCM using required equipment. After replacing VCM, go to next step.
  5. Using scan tool, select DTC, CLEAR INFO function. Start engine and allow it to reach operating temperature. Using scan tool, select DTC, SPECIFIC function and enter this DTC. Operate vehicle within conditions required to set 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, go to step  2.
  6. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTCs are displayed, go to applicable DTC test.
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