2021 Hyundai Tucson Engine Warranty Extension TSB

Hyundai has released a Dealer Best Practice document, TXXM/T6G, outlining an engine warranty extension and the inspection/replacement process for certain vehicles, including the 2021 Hyundai Tucson. This initiative addresses concerns where vehicles may experience a "Check Engine" warning lamp illuminated with DTC P1326, abnormal engine noise, or a no-crank/no-start condition stemming from connecting rod bearing wear or damage. The document clarifies the terms of the TXXM warranty extension and the requirements for Warranty Prior Approval (PA) submissions.

This best practice updates previous guidelines, noting that all T6G replacement engines now utilize long block engines and associated labor operations. It also provides clarity on the TXXM warranty extension terms and PA submittal requirements.

Symptoms

Owners of affected vehicles, including the 2021 Hyundai Tucson, may observe one or more of the following symptoms:

• The "Check Engine" warning lamp illuminated on the dashboard.
• The presence of Diagnostic Trouble Code (DTC) P1326.
• The engine exhibiting abnormal noise.
• A no-crank or no-start condition, particularly if related to connecting rod bearing wear or damage.

Fault Codes / DTCs

The primary diagnostic trouble code associated with this issue is:

Code	Description
P1326	Knock Sensor System Fault

Diagnosis and Repair Procedure

When a vehicle, such as the 2021 Hyundai Tucson, presents with the aforementioned symptoms, technicians are instructed to follow a specific service process. This involves inspecting the vehicle and, based on the inspection results, either replacing the engine or updating the engine's ECU software. The detailed repair procedures are outlined in TSB 22-01-023H-2. Parts ordering information and labor operation codes can be found in TSB 22-01-024H-2.

For proper diagnosis, technicians must use necessary Special Service Tools (SSTs), as referenced in TSB 22-01-023H-2. This includes ensuring the SST bearing clearance tester is properly configured and calibrated, as detailed in TSB 21-GI-009H. A Warranty Prior Approval (PA) request must always be submitted for applicable vehicles within the extended warranty period, regardless of whether the Knock Sensor Detection System (KSDS) software has been completed.

Extended Warranty Coverage (TXXM)

The warranty coverage for engine repair or replacement due to damage or malfunction from connecting rod bearing wear has been significantly extended. Under the TXXM program, coverage is now valid for 15 years or 150,000 miles, whichever occurs first, from the date of original retail delivery or first use. This extended warranty applies to both original and subsequent owners.

Important Warnings for Owners

Owners should be aware of several key points regarding this warranty extension and repair process:

• KSDS Software Requirement: Hyundai strongly encourages customers to complete the Knock Sensor Detection System (KSDS) software update (Service Campaign 966 or 982). This is communicated as a requirement for coverage under the extended warranty. Vehicles previously recalled under Recall 198 and Recall 209 are exempt from this KSDS requirement.
• Warranty Prior Approval (PA): "Notice! A warranty Prior Approval (PA) must be submitted on all applicable vehicles that exhibit the conditions outlined within this best practice document."
• Ineligible Vehicles: Commercial entities and individuals involved in buying, selling, leasing, or renting motor vehicles, as well as salvaged vehicles, are ineligible for the extended warranty.
• Fire-Related Damage: If there is evidence of fire or other components needing replacement due to fire, all affected parts must be disclosed to PA as part of the engine PA review process. No diagnosis or repairs should be performed until further directed.

Owner Action

If your 2021 Hyundai Tucson exhibits a "Check Engine" light with DTC P1326, abnormal engine noise, or a no-start condition, it is crucial to visit an authorized Hyundai dealer for inspection. Ensure that the Knock Sensor Detection System (KSDS) software update (Campaign 966 or 982) has been completed on your vehicle, as this is strongly encouraged for warranty eligibility. The dealer will diagnose the issue and submit a Warranty Prior Approval request to determine if repairs are covered under the extended TXXM warranty.

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Source: NHTSA ID: 10227320