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Home >> GMC >> 2007 >> Sierra Classic 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Hybrid Control System) >> Repair Instructions >> Generator Control Module Replacement (5.3L Engine w/RPO HP2) >> Removal Procedure
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Removal Procedure

WARNING: This page is about a different variant/trim than selected.
    Fig 1: View Of SGCM, Cover & Bolts
    GM1237061Courtesy of GENERAL MOTORS CORP.
  1. Disconnect the battery service disconnect/connect. Refer to Hybrid Battery Service Disconnect/Connect (5.3L Engine w/RPO HP2) .
  2. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .
  3. Remove the surge tank. Refer to Surge Tank Replacement .
  4. Remove the generator control module (GCM) coolant tank. Refer to Generator Control Module Coolant Tank Replacement .
  5. Remove the GCM cover bolts, and cover.
  6. Remove the 3-phase cable nuts to the GCM.
  7. Remove the 3-phase cable from the GCM.
    8. Fig 2: View Of CPA Retainer On Engine Harness Electrical Connector (5.3L Engine w/RPO HP2)
    GM1480429Courtesy of GENERAL MOTORS CORP.
  8. Remove the connector position assurance (CPA) retainer on the engine harness electrical connector.
  9. Disconnect the engine harness electrical connector.
    10. Fig 3: View Of SGCM Accessory Power Receptacle Electrical Connector (5.3L Engine w/RPO HP2)
    GM1257479Courtesy of GENERAL MOTORS CORP.
  10. Disconnect the accessory power receptacle electrical connector from the GCM.
    11. Fig 4: View Of SGCM Coolant Outlet Hose & Clamp (5.3L Engine w/RPO HP2)
    GM1480439Courtesy of GENERAL MOTORS CORP.
  11. Reposition the GCM coolant outlet hose clamp (2).
  12. Remove the GCM coolant outlet hose (1).
    13. Fig 5: View Of 14V Positive/Negative Battery Cable Bolt (5.3L Engine w/RPO HP2)
    GM1237045Courtesy of GENERAL MOTORS CORP.
  13. Loosen the 14-volt positive/negative battery cable bolt (1).
  14. Remove the red connector position assurance (CPA) retainer.
  15. Disconnect the 14-volt positive/negative battery cable.
    16. Fig 6: View Of 42-Volt Positive/Negative Battery Cable Bolt & Jumper Ground Wire Connector (5.3L Engine w/RPO HP2)
    GM1237049Courtesy of GENERAL MOTORS CORP.
  16. Loosen the 42-volt positive/negative battery cable bolt (1).
  17. Remove the red CPA retainer.
  18. Disconnect the 42-volt positive/negative battery cable.
  19. Disconnect the 42-volt jumper ground wire connector (2).
    20. Fig 7: View Of SGCM, Brace & Bolts
    GM1237056Courtesy of GENERAL MOTORS CORP.
  20. Remove the GCM rear bolt (2).
  21. Remove the GCM front bolt (3).
  22. Remove the brace (4).
  23. Remove the GCM.
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