2020-2022 Hyundai Push-Button Shifter Diagnosis TSB

Hyundai has released Technical Service Bulletin (TSB) 22-AT-001H to provide a detailed diagnostic procedure for issues related to the automatic transaxle push-button shifter. This TSB applies to various 2020-2022 Hyundai models, including the Palisade, Santa Fe, Sonata, and Tucson, covering both gasoline and hybrid variants. This bulletin supersedes TSB 21-AT-009H, adding more symptoms, Diagnostic Trouble Codes (DTCs), and specific repair steps.

Symptoms of a Faulty Push-Button Shifter

Owners of affected Hyundai vehicles may notice one or more of the following symptoms related to the push-button shifter:

• A warning message stating "Shifter System Malfunction” displayed in the instrument cluster.
• Difficulty or inability to shift into or out of gear.
• The vehicle may not shift out of Park.
• Incorrect gear display in the instrument cluster.
• The vehicle may not start.

If you experience any of these issues, it indicates a potential problem with the push-button shifter system, requiring a thorough Hyundai push-button shifter diagnosis.

Fault Codes (DTCs) Associated with Shifter Issues

Technicians may find the following Diagnostic Trouble Codes (DTCs) when diagnosing a push-button shifter malfunction. These codes help pinpoint the specific area of concern within the system:

DTC	Description
P060148	Functional Safety Level 2 SW failure
P065713	SBW actuator power relay error
P07FF00	SBW system Error - Abnormal power voltage
P0705**	Transmission range circuit
P106D00	SBW actuator stuck
P106D13	SBW actuator stuck - open/short
P106D14	SBW system Error - UVW open/short
P106D71	SBW actuator stuck
P28E214	Shift motor UVW circuit - open
P28E577	SBW actuator commanded position not reached - Short
P28E592	SBW motor performance
P28EA71	SBW actuator stuck
P28EA77	SBW actuator commanded position not reached
U110382	Lost communication with TGS lever
U110400	Lost communication with TGS lever

Diagnosis and Trigger Conditions

The diagnostic process for the Hyundai push-button shifter diagnosis involves using the Global Diagnostic System (GDS) to check for fault codes and analyze system data. Technicians will perform the following steps:

1. Fault Code Search: Connect the GDS, search for all fault codes, record them, and then delete them.
2. Data Analysis (Transmission): Start the engine and use the GDS to access the 'Data Analysis' and 'A/T' menus. Technicians will push the shift buttons to change gears (P, R, N, D) and observe if the correct gear is displayed in the cluster and on the GDS. If the gear display is incorrect, it indicates a potential fault in the SBW lever or its harness.
3. Data Analysis (SCU): With the engine running, access the 'Data Analysis' and 'SCU' menus on the GDS. Technicians will again push the shift buttons and check the 'Target Lever Position' and 'Actual Lever Position'. Discrepancies here suggest an issue with the SBW Control Unit (SCU), SBW actuator, or related harness. The 'Motor Feedback Current' should also be checked when a shift button is pressed.
4. Actuation Test: Turn the engine off, turn the ignition ON (without starting), and press the brake pedal. From the GDS 'Actuation Test' and 'SCU' menus, technicians will test the target positions for P, R, N, and D. If the GDS and cluster do not show the correct target position, it indicates a fault in the SCU, SBW actuator, or related harness.

Repair Procedure Summary

After diagnosing the issue, the repair procedure outlined in TSB 22-AT-001H may involve several steps, depending on the findings:

• Wiring Harness Inspection: If no faults are found during GDS tests, technicians will visually inspect the wiring harness between the PCM or TCU and the transmission for any damage, open/short circuits, or improperly inserted pins. Any damage found will be repaired or replaced.
• Santa Fe (TMA) Specific Check: For 2021 Santa Fe (TMA) models, if the customer reports "Shifter System Malfunction" or DTC P28E214 (Shift motor phase UVW circuit open), technicians will check for harness contact with the battery tray. This involves removing the air cleaner, battery, and battery tray.
• Harness Rerouting/Repair: If the harness to the SBW actuator is found to be in contact with the battery tray, the harness protector will be carefully unwrapped. The insulation on the wires will be inspected for damage. If damage is present, the control harness will be repaired or replaced.

This TSB also references other bulletins for specific component replacements: TSB 21-AT-007H for position sensor or SBW actuator replacement, and TSB 21-AT-008H-1 for certain DTCs like P060148, P106D00, P106D71, and U110382.

Required Tools or Parts

For this diagnosis and repair, technicians will utilize the Global Diagnostic System (GDS). Depending on the specific fault, replacement parts may include:

• SBW Lever (PNC 46700)
• SBW Control Unit (SCU) (PNCs 42950, 42951)
• SBW Actuator (PNC 42910)
• Position sensor (PNC 42700)
• ECU (Unified ECU/TCU) (PNC 39110)
• TCU (PNC 95440)

Owner Action

If your 2020-2022 Hyundai vehicle exhibits any of the symptoms described, such as a "Shifter System Malfunction" message or issues with shifting gears, it is recommended to schedule a service appointment with your authorized Hyundai dealer. Provide them with a clear description of the symptoms you are experiencing. The dealer will use TSB 22-AT-001H to diagnose and resolve the push-button shifter issue under warranty, if applicable.

---

Source: NHTSA ID: 10207809