2021-2024 Hyundai Tucson Incorrect Ratio DTC TSB

Hyundai has released Technical Service Bulletin (TSB) 24-AT-002H to address automatic transmission incorrect ratio Diagnostic Trouble Codes (DTCs) that may appear in a wide range of its vehicles, including the 2021-2024 Hyundai Tucson. This bulletin, which supersedes TSB 20-AT-001H, provides a detailed procedure for diagnosing and potentially replacing the automatic transmission if these specific DTCs are detected. The issue is generally related to transmission clutch slip exceeding its limit in a particular gear.

Symptoms

Owners of affected Hyundai vehicles, including the 2021-2024 Hyundai Tucson, might notice issues related to the automatic transmission's performance. While the TSB does not specify direct owner-perceptible symptoms beyond the illumination of a malfunction indicator lamp (MIL) and the storage of a DTC, the underlying cause is a "transmission clutch slip in gear above limit." This condition could manifest as rough shifting, delayed engagement, or a general feeling of the transmission not operating correctly. The primary indicator for technicians will be the presence of specific incorrect ratio DTCs.

Fault Codes / DTCs

This TSB specifically addresses several incorrect ratio DTCs, indicating a problem with the transmission's gear ratios. These codes are crucial for diagnosing the Hyundai Tucson incorrect ratio DTC issue.

Incorrect Ratio DTCs:

DTC	Description	6-Speed FWD	8-Speed FWD	8-Speed RWD
P0731	Gear 1 incorrect ratio	X	X	X
P0732	Gear 2 incorrect ratio	X	X	X
P0733	Gear 3 incorrect ratio	X	X	X
P0734	Gear 4 incorrect ratio	X	X	X
P0735	Gear 5 incorrect ratio	X	X	X
P0729	Gear 6 incorrect ratio	X	X	X
P076F	Gear 7 incorrect ratio		X	X
P0730	Gear 8 incorrect ratio		X	X

Additionally, the TSB lists other DTCs that, if present, would require a different diagnostic path, indicating issues with sensors or solenoids:

Input/Output Speed Sensor DTCs:

DTC	Description
P0717	Input speed sensor – No signal
P0721	Output speed sensor – Range/performance
P0722	Output speed sensor – No signal

Solenoid DTCs:

DTC	Description
P0743	Torque converter solenoid (TC)
P0748	Pressure control solenoid (PC)
P0753	Shift solenoid A
P0758	Shift solenoid B
P0763	Shift solenoid C
P0768	Shift solenoid D
P0773	Shift solenoid E
P2709	Shift solenoid F

Diagnosis / Trigger Conditions

Diagnosis for the Hyundai Tucson incorrect ratio DTC begins with connecting a Global Diagnostic System (GDS) tool to the vehicle. Technicians will check for any stored DTCs and record them before clearing them. The next step depends on the type of DTCs found:

• If input/output speed sensor DTCs or solenoid DTCs are present: The technician must refer to the appropriate TSBs or repair procedures specific to those sensor or solenoid issues. These are not directly resolved by this TSB.
• If ONLY incorrect ratio DTCs (P0731, P0732, P0733, P0734, P0735, P0736, P0729, P076F, P0730) are present: The TSB directs the technician to consult the related shop manual and proceed with replacing the transmission assembly. This is the core repair action for the Hyundai Tucson incorrect ratio DTC when no other related faults are detected.

Repair Procedure Summary

The primary repair procedure outlined in TSB 24-AT-002H for the Hyundai Tucson incorrect ratio DTC involves the replacement of the automatic transmission assembly. This is only performed if the diagnostic steps confirm that only the specific incorrect ratio DTCs are present and no other sensor or solenoid faults are identified. The TSB specifies using operation code 45000R** for transmission assembly replacement or 45000RQ0 for diagnostic tool operation. Technicians will refer to Hyundai's WebLTS (Labor Time Standards) for current labor times and the Web Parts Catalog for the correct transmission part number.

Important Warnings

Owners should be aware of the following warranty information and procedures:

• Normal warranty applies: Standard warranty terms cover this repair.
• Claim submission: Claims must be submitted on the Claim Entry Screen as a “Warranty” type.
• Out-of-warranty parts: If a part needing replacement is found to be out of warranty, a Prior Approval request for goodwill consideration must be submitted before performing the work.
• Parts return: Incident parts are subject to callback through the normal Warranty Technical Center (WTC) parts return process. Claims may be debited if the part is not returned as required.

Owner Action

If you own a 2021-2024 Hyundai Tucson or any other affected Hyundai model and experience transmission-related issues, especially if a malfunction indicator light is on, it is recommended to visit an authorized Hyundai dealership. The dealership technicians are equipped with the necessary diagnostic tools and have access to TSB 24-AT-002H to properly diagnose and address any automatic transmission incorrect ratio DTCs. This repair is typically covered under the vehicle's warranty if applicable.

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Source: NHTSA ID: 10253275