2021-2022 Hyundai Position Switch DTCs P0705, P0706

Hyundai has issued Technical Service Bulletin (TSB) 21-AT-007H to address concerns related to the 8-speed front-wheel-drive automatic transaxle position switch. This bulletin applies to several 2021-2022 Hyundai models, including the Palisade, Santa Fe, Sonata, and Tucson. The TSB outlines diagnostic procedures and repair steps for vehicles experiencing specific Diagnostic Trouble Codes (DTCs) and transmission-related symptoms. This TSB 21-AT-007H supersedes the previous TSB 20-AT-006H, incorporating additional information and models.

Symptoms

Owners of affected Hyundai vehicles may observe one or more of the following symptoms, indicating a potential issue with the automatic transaxle position switch:

• "Malfunction Indicator Light (MIL) illuminated"
• "5th gear fail-safe"
• "No gear indication in cluster"
• "Intermittently won't shift into D or R"
• "Intermittently won't shift out of Park"
• "Intermittently no engine crank/no start in 'P' or 'N' with or without MIL or DTC"

These symptoms often appear in conjunction with specific Diagnostic Trouble Codes stored in the vehicle's computer system.

Diagnostic Trouble Codes (DTCs)

Technicians diagnosing this issue will typically find one or more of the following DTCs stored in the vehicle's automatic transaxle control module:

Code	Description
P070500	Transmission range sensor circuit malfunction
P070512	Transmission range sensor circuit malfunction
P070514	Transmission range sensor circuit malfunction
P07051C	Transmission range sensor circuit malfunction
P070600	Transmission range sensor circuit range/performance
P070661	Transmission range sensor circuit range/performance
P070696	Transmission range sensor circuit range/performance

Diagnosis Procedure

Diagnosis for the Hyundai Tucson position switch issue begins by connecting a Global Diagnostic System (GDS) to the vehicle. Technicians will check for and record any stored DTCs from the "Automatic Transaxle" menu, then delete them. The next step involves selecting "Data Analysis, A/T menu" and monitoring the "Current Gear" while depressing the brake pedal and cycling the shift lever through all gear positions (P, R, N, and D). The GDS reading and the cluster indicator should show the correct gear.

If the GDS does not show the correct current gear, a visual inspection of the wiring harness between the ECU and the position sensor (inhibit switch) is performed. This checks for damaged wires, open or short circuits, or improperly inserted connector pins. If wiring damage is found, it must be repaired or replaced, followed by a test drive.

Ground connections for the electronic shift lever are also checked. This involves turning on the ignition and headlights, then using a Digital Volt-Ohm Meter (DVOM) to measure the voltage drop between the wiring terminal and ground. The voltage drop specification is less than 0.2V. If the reading is higher, the terminal and bolt threads must be cleaned and tightened to 7-9 lb-ft (1.0-1.2 kgf.m, 10-12 N.m).

Repair Procedure Summary

If diagnosis points to the position sensor, the repair outlined in TSB 21-AT-007H involves several steps. First, various components in the engine bay are removed, including retaining clips, the air intake duct, air cleaner, hoses, battery, and battery tray. The battery tray bolts should be torqued to 7-9 lb-ft (1.0-1.2 kgf.m) during reinstallation. Any preset radio stations should be recorded before battery removal.

Next, the shift by wire (SBW) actuator connector is disconnected, and the SBW actuator itself is removed by unbolting three fasteners. For some models, pliers may be needed to pinch tabs and disconnect the harness. The position sensor connector is then disconnected by pushing down on its tab and the lock tab. The old position sensor is removed by unbolting two mounting bolts.

A new position sensor is installed, with its two mounting bolts loosely tightened initially. The manual valve is then turned two detents counter-clockwise to place it in the Neutral position, ensuring it aligns 90° to the radiator. An alignment tool (part numbers 09459-4G100 or 09459-4G200, depending on the model) is used to align the transmission hole and the position sensor. The two bolts securing the position sensor are then tightened to 7-9 lb-ft (1.0-1.2 kgf.m, 10-12 N.m).

After reconnecting the position switch connector, the manual valve is turned two detents clockwise back to the Park position. The electronic shift actuator is reinstalled and torqued to 15-19 lb-ft (2-3 kgf.m, 21-26 N.m), and its harness tab is reconnected. All previously removed parts are reinstalled in reverse order, and radio stations are reset.

Finally, the DTCs are cleared, and the vehicle is test-driven for two key-on to key-off driving cycles. If the DTCs do not reappear, the repair is complete. If DTCs recur, the control wiring between the PCM or TCU and the position sensor should be repaired or replaced. If the DTCs still persist after wiring repair, the PCM (ECU/TCU) or TCU itself may need replacement.

Required Parts and Tools

For this repair, specific parts and special tools are required:

• Position Sensor Part Number: 42700-4G6** (This part number applies to all listed models, though specific variations may exist based on PNC code 42700E or 42700G).
• Service Tool (SST) for Alignment:
  • 09459-4G100 (for Palisade, Santa Fe Hybrid, Sonata Hybrid, Tucson, Tucson Hybrid)
  • 09459-4G200 (for Sonata, Santa Fe 2.5L)

Technicians needing replacement SSTs can contact Bosch at 866-539-4248.

Warranty Information

This service bulletin provides specific warranty claim details:

• Operation Code (Op Code):
  • 42700R00 for "Replace position sensor"
  • 42700RH1 for "Hybrid Additional" (for hybrid models)
  • 42700RQ0 for "GDS" (Global Diagnostic System usage)
• Operation Time (Op Time): Refer to WEBLTS for current Labor Time Standards (LTS) time.
• Causal Part: 42700-4G6** (as listed in the Parts Information table).
• Nature Code: I3A
• Cause Code: ZZ3

What Owners Should Know

If your 2021-2022 Hyundai Palisade, Santa Fe, Sonata, or Hyundai Tucson position switch is causing symptoms like the Malfunction Indicator Light (MIL) illuminating, or issues with shifting, it is important to have your vehicle inspected by an authorized Hyundai dealer. This TSB provides the official diagnostic and repair procedure for these specific DTCs and symptoms.

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Source: NHTSA ID 10200845