LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Hyundai >> 2018 >> Sonata Plug-In Hybrid >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (PHEV) >> Engine Control Module (ECM) >> Repair Procedures >> Removal
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Repair Procedures: Removal

CAUTION:
  • When replacing the ECM, the vehicle equipped with the immobilizer must be performed in order as the procedure below.

[In the case of installing used ECM] 
  1. Perform "ECM Neutral mode" procedure with GDS.

    (Refer to "KEYLESS ENTRY AND BURGLAR ALARM (PHEV) " or "SMART KEY SYSTEM (PHEV) ")

  2. After finishing "ECM Neutral mode", perform "Key teaching" procedure with GDS.

    (Refer to "KEYLESS ENTRY AND BURGLAR ALARM (PHEV) " or "SMART KEY SYSTEM (PHEV) ")


[In the case of installing new ECM] 
CAUTION:
  • When replacing the ECM, the vehicle equipped with the smart key system (Button start) must be performed in order as the procedure below.

[In the case of installing used ECM] 
  1. Perform "ECM Neutral mode" procedure with GDS.

    (Refer to "SMART KEY or KEYLESS ENTRY AND BURGLAR ALARM (PHEV) ")

  2. After finishing "ECM Neutral mode", insert the key (or press the start button) and turn it to the IGN ON and OFF position. Then the ECM learns the smart key information automatically.

[In the case of installing new ECM] 
  • Insert the key (or press the start button) and turn it to the IGN ON and OFF position. Then the ECM learns the smart key information automatically.
  1. Turn ignition switch OFF and disconnect the negative (-) battery cable.
  2. Disconnect the ECM connector (A).
    G12787068Courtesy of HYUNDAI MOTOR AMERICA
  3. Remove the air cleaner assembly.

    (Refer to "AIR CLEANER ")

  4. Remove the battery.

    (Refer to "AUXILIARY 12V BATTERY ")

  5. Remove the HPCU.

    (Refer to "HPCU (HYBRID POWER CONTROL UNIT) ")

  6. Disconnect the high voltage cable bracket (A).
    G12787069Courtesy of HYUNDAI MOTOR AMERICA
  7. Remove the ECM bracket assembly (C) after loosening the bolt (A) and nut (B).
    G12787070Courtesy of HYUNDAI MOTOR AMERICA
  8. Remove the ECM (C) from the bracket after removing the screw (A) and nut (B).
    G12787071Courtesy of HYUNDAI MOTOR AMERICA