Genuine Hyundai/Kia Hybrid Starter Generator (HSG) Assembly

**Genuine OEM HSG Assembly - Hybrid Starter Generator**

**Part Number: 37390-2E900**

Manufacturer: Hyundai / Kia (Original Equipment Manufacturer)

Alternative Names: HSG Generator, Generator Housing Assembly (Often referred to as the Hybrid Motor/Generator Unit)

System: **Hybrid Electric Vehicle (HEV) Powertrain**

1. Part Features and Specifications

  • **Function:** This is the **Hybrid Starter Generator (HSG) Assembly**. It is a crucial component in the hybrid system, performing three main functions:
    1. **Engine Start:** Cranks the gasoline engine (Hybrid Starter).
    2. **Power Generation:** Recharges the 12V auxiliary battery and the high-voltage battery (Generator function).
    3. **Assist/Regen:** Provides torque assist to the engine or regenerates energy during braking (Motor function).
  • **Type:** Typically a **High-Voltage 3-Phase AC Electric Motor/Generator**. It is mounted to the engine in place of the conventional alternator and starter motor.
  • **OEM Quality:** A genuine part ensures precise electrical tolerances, correct cooling passages, and communication with the Hybrid Control Unit (HCU).

2. Applicable Models (Detailed)

Used in the first generation of Hyundai/Kia parallel hybrid sedans.

  • **Hyundai Sonata Hybrid (YF)**: Model years **2011, 2012** (Specific 2.4L Hybrid models)
  • **Kia Optima / K5 Hybrid (TF)**: Model years **2011, 2012** (Specific 2.4L Hybrid models)
  • **Note:** Compatibility is generally limited to the earlier hybrid models before significant redesigns.
  • **Important:** **You MUST confirm compatibility using your Vehicle Identification Number (VIN)**, as part numbers often change even with minor revisions to hybrid powertrain components.

3. Superseded/Interchangeable Parts

Part Status Part Number
**Current Part Number** 37390-2E900
**No commonly listed direct superseded or alternative OE numbers.** N/A

**NOTE:** Given the complexity and high voltage of this component, using only the exact OEM number is highly recommended.

4. Material, Finish, and Weight

  • **Material:** Heavy-duty **Cast Aluminum** housing; internal components include **Copper** windings, **Magnets**, and **Steel** rotors/stators.
  • **Finish:** Natural metallic casting finish.
  • **Weight:** Approximately **14.0 kg** (30.9 pounds). *Heavy due to high-power motor components.*

5. Installation Method (Extreme Specialist Service Required)

Replacement of the HSG is a major operation requiring high-voltage safety training and diagnostic equipment.

  • **Location:** Mounted to the engine block via the serpentine belt (in a mild/belt-driven hybrid setup) or integrated into the transmission housing (in full parallel setups like the one used here). *The 37390-2E900 is belt-driven and mounted externally.*
  • **Steps Overview (General - High-Voltage Expert Level):**
    1. **CRITICAL:** Safely disable the high-voltage system (Remove safety plug, wait for discharge).
    2. Disconnect the 12V battery.
    3. Remove the serpentine belt.
    4. Disconnect the large high-voltage cable bundle and the low-voltage communication wire.
    5. Remove the mounting bolts and lift the old HSG assembly.
    6. Install the new **37390-2E900** assembly and reconnect all high-voltage and low-voltage lines, torquing connections precisely.
    7. Re-enable the high-voltage system and perform necessary ECU/HCU calibration and learning procedures using an advanced diagnostic tool.

**EXTREME HAZARD WARNING:** This component handles extremely high voltage. Improper service can lead to lethal electrocution and severe damage to the vehicle's electrical system. **Service MUST be performed only by certified high-voltage hybrid technicians.**

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