2021-2023 Hyundai Elantra Kona Warning Lamp TSB

Symptoms

Owners of certain 2021-2023 Hyundai Elantra and 2022-2023 Hyundai Kona vehicles equipped with the 1.6 liter T-GDI Gamma 2 engine may experience a warning lamp illuminating on the dashboard. This illumination is typically accompanied by one or more specific Diagnostic Trouble Codes (DTCs) related to engine oil level or coolant system performance. If you see a Hyundai Elantra warning lamp P250F, this bulletin applies to your vehicle.

Fault Codes / DTCs

This Technical Service Bulletin (TSB) specifically addresses vehicles that may exhibit the following DTCs:

Code	Description
P250F	Engine Oil Level Too Low
P011B	Engine Coolant Temperature/intake Air Temperature Correlation
P050C	Engine Coolant Temperature/intake Air Temperature Correlation
P00B7	Engine Coolant Flow Low/Performance
P2B60	Engine Coolant Flow Low/Performance

Diagnosis / Trigger Conditions

The warning lamp and associated DTCs are triggered by logic issues within the Engine Control Unit (ECU) software. The presence of these codes indicates a need for an ECU software update to improve the logic for the 1.6T-GDI engine. The issue is not necessarily a mechanical failure but a software interpretation problem.

Important Warnings

Technicians performing this update must be aware of critical conditions to ensure a successful process:

• GDS ECU Update Mode: The ECU update must initially be performed in "Auto Mode" using the GDS system. If the update begins but then fails in Auto Mode, technicians must switch to "Manual Mode" to recover and complete the update.
• Battery Low Voltage: A "Warning! lower Battery Voltage" message may appear if the vehicle's battery voltage is below 12 volts. If this occurs, the technician must select "Back" on the GDS system, attach a battery charger to ensure adequate charge, turn the ignition back ON, and then retry the ECU update. This prevents update failures due to insufficient power.

Repair Procedure Summary

The repair involves updating the Engine Control Unit (ECU) software using the Hyundai Global Diagnostic System (GDS). The general steps are as follows:

1. Perform ECU Update: Initiate the ECU update process in "Auto Mode" via the GDS system.
2. Verify ROM ID: Use the "ID Check" function within the GDS to confirm the correct ROM ID before proceeding with the software update.
3. Document Completion: Take a screenshot of the "ECU update complete" screen using a tablet and upload it to the STUI system for documentation.
4. Reset ECU: Once the update shows 100% completion, cycle the ignition key to OFF for at least 10 seconds to properly reset the control unit.
5. Clear Fault Codes: Perform an "All Systems Fault Code" search and erase any DTC history that may have incidentally occurred during the ECU update process.
6. Confirm Operation: Start the vehicle to confirm proper operation and ensure the warning lamp is no longer present.

Required Tools or Parts

To perform this ECU software update, technicians will require:

• Hyundai Global Diagnostic System (GDS) with the latest software.
• A battery charger to maintain adequate vehicle battery voltage during the update process.
• A tablet or device capable of taking screenshots for documentation purposes.

ECU ROM ID Information

This section provides the specific ROM ID information for the ECU update, categorized by vehicle model, transmission type (TM), immobilizer status, and ECU part number. Technicians must use these tables to identify the correct "Old" ROM ID and ensure the update applies the corresponding "New" ROM ID. This ensures the correct software version is installed for the specific vehicle configuration.

ROM ID Information Table: Event 1054 (Elantra CN7)

| Model | TM | Immobilizer? | ECU Part Number | Old ROM ID ```json {