2012 Kia Optima HybridFACTORY OEM SERVICE PROCEDURE

Repair procedures: Removal

NOTE: When replacing the ECM, the vehicle equipped with immobilizer must be performed the procedure as below.
[In the case of installing used ECM]
  1. Perform "Neutral mode" procedure with GDS. (Refer to "IMMOBILIZER LAMP " in BE group)
  2. Insert the key and turn it to the IGN ON and OFF position.

Then the ECM key register process is completed automatically.
[In the case of installing new ECM]
  • Insert the key and turn it to the IGN ON and OFF position.

Then the ECM key register process is completed automatically.
  1. Shut off the High Voltage circuit. (Refer to HIGH VOLTAGE SHUTOFF PROCEDURE .
  2. Turn ignition switch OFF and disconnect the negative (-) battery cable.
  3. Disconnect the ECM Connector (A).
    Fig 1: Identifying ECM Connector
    G08312829Courtesy of KIA MOTORS AMERICA, INC.
  4. Remove the air cleaner assembly (Refer to REMOVAL AND INSTALLATION "Intake And Exhaust System" in EM group).
  5. Release the reservoir (A) after removing the bolts (B).
    6. Fig 2: Identifying Coolant Reservoir (A) And Mounting Bolts (B)
    G00529389Courtesy of KIA MOTORS AMERICA, INC.
  6. Disconnect the power cable (A) from the HPCU.
    1. Pull the lever (B) in the direction of the arrow with the hook (C) pressed.
    2. Press the lever (D), and then pull the power cable connector.
      3. Fig 3: Identifying Power Cable From The HPCU
      G00529390Courtesy of KIA MOTORS AMERICA, INC.
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.

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