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Home >> GMC >> 2011 >> Yukon Hybrid, 4WD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Controls And Fuel - Hybrid (LZ1) - Repair Instructions >> Repair Instructions >> Engine Control Module Replacement >> Removal Procedure
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Removal Procedure

    Fig 1: Engine Wiring Harness Electrical Connector And ECM
    GM1960211Courtesy of GENERAL MOTORS CORP.
  1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.
  2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  3. Remove the battery and battery tray. Refer to Battery Tray Replacement .
  4. Remove the under hood electrical center. Refer to Underhood Electrical Center or Junction Block Replacement .
  5. Disengage the engine wiring harness electrical connector retainers and remove the connectors (2) from the ECM (1).
    6. Fig 2: Bracket Retainer Tabs, ECM Bracket And Tab
    GM1960213Courtesy of GENERAL MOTORS CORP.
  6. Disengage the bracket retainer tabs (1) securing the ECM to the bracket.
  7. Remove the ECM (3) from the bracket.
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