2021-2023 Hyundai IVT Oil Pressure Sensor DTCs P0845 P0846 P0867

Certain 2021-2023 Hyundai vehicles equipped with the Intelligent Variable Transmission (IVT) may illuminate a check engine light or malfunction indicator light. This issue is typically linked to specific Diagnostic Trouble Codes (DTCs) related to the IVT oil pressure sensor. Hyundai Technical Service Bulletin 23-AT-010H provides a repair procedure focused on replacing the oil pressure sensor, offering a more targeted solution than replacing the entire IVT assembly.

Symptoms of a Failing IVT Oil Pressure Sensor

The primary symptom owners will notice is the illumination of the check engine light or a malfunction indicator light on the dashboard. This indicates that the vehicle's engine control unit has detected an anomaly within the Intelligent Variable Transmission system, specifically concerning oil pressure readings. If your vehicle exhibits these warning lights and stores the associated DTCs, it's crucial to have it diagnosed by a qualified technician.

Diagnostic Trouble Codes (DTCs)

This bulletin specifically addresses the following Diagnostic Trouble Codes (DTCs) that may be stored in the vehicle's system:

Important Warnings for Owners

It is critical for owners and technicians to understand the following advisories from Hyundai:

• "Only replace the oil pressure sensor if the vehicle has only DTCs present and no drivability concerns (eg. IVT slipping/shift shock, poor acceleration, or unable to shift into gear). If drivability concerns are present, replace the entire IVT assembly."
• "Maintain a clean working environment when working on the IVT. Use a coated apron, latex gloves, and a clean stainless-steel tray to prevent any foreign material from entering the IVT, especially when replacing the oil pressure sensor. Otherwise, damage to the transmission may occur."
• "The IVT is composed of delicate components. Be careful not to cause any damage to the components when disassembling and reassembling the IVT."
• "Do not reuse the Intelligent Variable Transmission Fluid (IVTF). Follow the shop manual to refill the IVT with new IVTF."
• "Do not apply accelerator pedal and brakes, or operate shift levers during P range, learning. (If operated during learning, re-engage after shutting off.)"

Repair Procedure Summary

The repair for the Hyundai IVT oil pressure sensor issue involves several key steps, performed by a qualified technician:

1. Diagnosis: The technician will first confirm the presence of DTCs P0845, P0846, or P0867 and verify that there are no drivability concerns such as slipping, shift shock, poor acceleration, or inability to shift into gear. If drivability concerns are present, the entire IVT assembly must be replaced.
2. Sensor Replacement: The faulty IVT oil pressure sensor is carefully replaced. This process requires maintaining a clean environment to prevent contamination of the delicate IVT components.
3. Characteristic Input: After replacing the sensor, the technician uses the Global Diagnostic System - Mobile (GDS-M) to input the new oil pressure sensor characteristics. This involves selecting the "Pressure Sensor Characteristics Input (Pressure Sensor Replacement)" function and entering the value "76" when prompted.
4. Adaptive Values Learning: The final step is to perform the Transmission Control Unit (TCU) adaptive values learning procedure using GDS-M. This learning process requires the Intelligent Variable Transmission Fluid (IVTF) temperature to be between 86-194°F (30-90°C). During this learning phase, it is crucial not to apply the accelerator pedal or brakes, nor to operate the shift levers.

Required Tools and Parts

To perform this repair, specific parts and diagnostic tools are necessary:

The Global Diagnostic System - Mobile (GDS-M) is also required for performing the characteristic input and adaptive learning procedures.

Warranty Information

This repair is covered under normal warranty conditions. Technicians are instructed to submit claims as "Warranty" type. It is important to note that claims are subject to debit if the replaced part is not returned to the Warranty Technical Center (WTC). If other parts are found to need replacement during this service and are still under warranty, a separate claim should be submitted. For out-of-warranty parts, a Prior Approval request for goodwill consideration is recommended.

Owner Action

If your 2021-2023 Hyundai Elantra, Venue, Kona, or Accent vehicle is displaying a check engine light or malfunction indicator light and you suspect an issue with the Hyundai IVT oil pressure sensor, it is recommended to visit an authorized Hyundai dealership. They have the necessary diagnostic tools and trained technicians to accurately diagnose the problem, confirm the presence of DTCs P0845, P0846, or P0867, and perform the appropriate repair as outlined in TSB 23-AT-010H.

Source: NHTSA ID: 10241878