2021 Hyundai Tucson Engine Monitoring Logic TSB 22-01-028H-1

Hyundai has launched Service Campaign 966 (TSB 22-01-028H-1) to enhance the engine monitoring logic in several of its vehicles, including the 2021 Hyundai Tucson. This campaign specifically targets the knock sensor software to improve its detection of abnormal engine bearing noise. Early detection is crucial to prevent potentially severe engine damage.

Symptoms

If your vehicle experiences abnormal engine bearing noise, the knock sensor software, once updated, will detect this condition. When detected, you may observe the following symptoms:

• The Malfunction Indicator Lamp (MIL) will blink continuously.
• The vehicle will enter "Engine Protection Mode".
• You may notice slower acceleration and a reduced maximum speed.
• Engine RPMs will be limited to approximately 1800-2000 RPM.

Fault Codes / DTCs

When the abnormal engine bearing noise is detected and the vehicle enters "Engine Protection Mode", the Engine Control Module (ECM) will record a specific diagnostic trouble code:

• P132600

Diagnosis / Trigger Conditions

The primary trigger for this issue and the subsequent "Engine Protection Mode" is the detection of abnormal engine bearing noise by the knock sensor. The updated software aims to improve the sensitivity and accuracy of this detection, allowing for earlier intervention before significant engine damage occurs.

Repair Procedure Summary

Dealers are instructed to perform an Engine Control Module (ECM) software update as part of Service Campaign 966 (TSB 22-01-028H-1). The procedure involves several key steps:

1. Vehicle Check: Technicians must first check the vehicle's information screen via WEBDCS to identify any open campaigns or recalls.
2. Battery Voltage Check: Before starting the ECU update, the battery voltage must be checked. If it is below 12 volts, the battery needs to be charged for at least 15 minutes to ensure an adequate state of charge and prevent ECU update failure. The ignition must be cycled OFF/ON before retrying the update if charging was needed.
3. ECU Update: All GDS ECU updates must initially be performed in Auto Mode. If the update starts but then fails in Auto Mode, technicians should switch to Manual Mode to complete the process. For additional tablet-based Mobile GDS ECU update information, refer to TSB 15-GI-001.
4. Control Unit Reset: After the ECU Upgrade process shows 100% completion, it is critical to "cycle the ignition key again to OFF for at least 30 seconds to reset the control unit." This step is crucial for establishing normal powertrain communication and preventing system errors.
5. DTC Clearance & Radio Presets: Any Diagnostic Trouble Codes (DTCs) present after the ECU update must be cleared. If necessary, the customer's radio preset stations should be reprogrammed.

Important Warnings

If the Automatic ECU Upgrade process fails, technicians must "cycle the ignition key to OFF for at least 30 seconds to reset the control unit" before resuming programming using the Manual ECU Upgrade processes. Similarly, after the ECU Upgrade process shows 100% complete, it is mandatory to "cycle the ignition key again to OFF for at least 30 seconds to reset the control unit" to ensure proper system initialization and prevent errors.

Required Tools or Parts

No specific parts are needed for this service campaign, as it primarily involves a software update to the Engine Control Module (ECM).

Owner Action

If you own a 2021 Hyundai Tucson and experience symptoms related to the Hyundai Tucson engine monitoring logic, such as a blinking Malfunction Indicator Lamp or your vehicle entering "Engine Protection Mode" with DTC P132600, you should contact your authorized Hyundai dealer to schedule an appointment. This service campaign is performed free of charge.

Campaign History and Scope

This Service Campaign 966 (TSB 22-01-028H-1) has undergone several revisions and expansions to include a broader range of Hyundai and Kia models and model years. Initially launched as TSB 21-01-023H on March 30, 2021, it has been updated multiple times to incorporate additional vehicles and refine the ECU update procedures. The campaign now covers various Santa Fe, Tucson, Sonata Hybrid, Veloster, and Elantra models equipped with Theta II 2.4L MPI, Nu 2.0L GDI, and Gamma 1.6L GDI engines, reflecting Hyundai's commitment to addressing the engine monitoring logic across its fleet.

NHTSA ID: 10211664