2024-2025 Hyundai Tucson P059A Check Engine Light TSB

Symptoms

Owners of certain 2024-2025 Hyundai Tucson (NX4A) vehicles may experience an "illuminated check engine light" on their dashboard. This warning light indicates an issue within the vehicle's systems that requires attention.

Fault Codes / DTCs

The specific Diagnostic Trouble Code (DTC) associated with this issue is:

• P059A: Active Air Flap On-Board Diagnostic Sensor Circuit

Diagnosis / Trigger Conditions

The root cause for the "illuminated check engine light" and DTC P059A is a faulty connection within the Active Air Flap (AAF) on-board diagnostic (OBD) sensor components. This fault is attributed to improper soldering during manufacturing, leading to a malfunction of the sensor.

Repair Procedure Summary

Hyundai Technical Service Bulletin 24-BE-019H details the steps for replacing the Active Air Flap (AAF) on-board diagnostic sensors. The procedure involves several key steps:

1. Preparation: The technician must first turn off the vehicle's ignition and disconnect the negative (-) battery terminal to ensure safety during the repair.
2. Bumper Removal: The front bumper assembly needs to be removed to access the AAF sensors. This step requires careful reference to the vehicle's shop manual for proper removal and installation procedures.
3. Sensor Access: Once the bumper is removed, the two AAF sensors (labeled 'C' in the TSB's figures) located on the front bumper are identified.
4. Sensor Replacement: The connectors (labeled 'D') for both AAF sensors are disconnected, and the mounting screws (labeled 'E') are removed to take out the old sensors. New AAF sensors are then installed, and their connectors are reconnected.
5. Reassembly: All components, including the front bumper assembly, are reinstalled in reverse order of removal. The negative (-) battery terminal is reconnected.
6. Fault Code Clearance: Finally, an All Systems Fault Code search is performed using diagnostic tools, and any incidentally stored DTC history, including the Hyundai Tucson P059A code, is erased.

Required Tools or Parts

To perform the repair outlined in TSB 24-BE-019H, the following part is required:

• AAF Sensor: Part Number 86970-T1000QQH (Quantity: 2)

Important Warnings

Owners and technicians should be aware of the following important information regarding this TSB:

• Parts Return Policy: Incident parts are subject to callback through the normal Warranty Technical Center (WTC) parts return process. "Claim is subject to debit if the part is not returned."
• Bumper Cover Labor: The TSB operation time for the repair includes the removal and reinstallation of the front bumper cover assembly. However, it specifically states that it does not include the swapping of parts to a replacement bumper cover. Therefore, the Labor Time Standard (LTS) for Front Bumper Cover Remove & "Replace" does not apply for that specific action.

Owner Action

If you own a 2024-2025 Hyundai Tucson (NX4A) and are experiencing an "illuminated check engine light" with DTC P059A, it is recommended to schedule an appointment with your authorized Hyundai dealer. Refer to Technical Service Bulletin 24-BE-019H when discussing the issue with the service department. This repair is typically covered under warranty if your vehicle falls within the specified production dates of 06/02/2024 to 10/03/2024.

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Source: NHTSA ID: 11012046