2009 Chevrolet HHR SS, AutomaticFACTORY OEM SERVICE PROCEDURE

Removal Procedure

    Fig 1: Locating ECM/TCM Cover
    GM1631889Courtesy 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 ECM/TCM cover.
    4. Fig 2: Identifying ECM Electrical Connector
    GM2000940Courtesy of GENERAL MOTORS CORP.
  4. Disconnect the ECM electrical connectors (1).
    5. CAUTION: Control module damage may result when the metal case contacts battery voltage. DO NOT contact the control module metal case with battery voltage when servicing a control module, using battery booster cables or when charging the vehicles battery.
  5. Disengage the plastic retainer tabs (2) and remove the ECM (3).
    6. Fig 3: View of ECM Retaining Tab
    GM1833662Courtesy of GENERAL MOTORS CORP.
  6. Release the retaining tab (1) in order to release the ECM from the underhood junction block bracket.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.