2021-2024 Kia Models HF EOP Connector Contamination TSB

Why This Matters

Kia Technical Service Bulletin (TSB) TRA113 highlights a crucial preventative measure for 2021-2024 Kia models equipped with Idle-Stop-Go (ISG) and a High-Flow Electric Oil Pump (HF EOP). The HF EOP is a vital component for the transmission, especially in vehicles utilizing ISG technology, which temporarily shuts off the engine when the vehicle is stopped to save fuel. Proper function of the HF EOP is essential for smooth transmission operation and the overall efficiency of the ISG system.

The TSB specifically warns that the HF EOP protective connector cover may not always be installed on new or remanufactured transmission assemblies. This absence leaves the HF EOP connector vulnerable to contamination from debris, oil, or coolant during shipping, handling, or installation. Such contamination can lead to future transmission performance issues. Therefore, preventing Kia HF EOP connector contamination is critical for the longevity and reliability of your vehicle's transmission.

Potential for Transmission Issues

While this TSB does not list specific diagnostic trouble codes (DTCs) or immediate symptoms, it addresses a preventative measure to avoid potential future transmission problems. If the HF EOP connector becomes contaminated, it could lead to intermittent or complete failure of the electric oil pump, which in turn could affect transmission shifting, performance, or the proper functioning of the Idle-Stop-Go system. Owners might experience unusual transmission behavior or a malfunction of the ISG feature if the Kia HF EOP connector contamination is not prevented.

Trigger Conditions for Precautions

These precautions are necessary under specific circumstances to prevent Kia HF EOP connector contamination:

• When a new or remanufactured transmission assembly is being installed and it arrives without the HF EOP protective connector cover.
• Anytime the HF EOP connector is removed or being serviced on the vehicle, regardless of whether a new transmission is being installed.

Preventative Steps During Service

To ensure the HF EOP connector remains clean and protected, technicians are instructed to follow these steps:

1. Cleaning: Use shop air to thoroughly clean the HF EOP connector, removing any oil, coolant, or debris that may have accumulated.
2. Covering: Immediately cover the cleaned connector using non-residue tape or a plastic covering to prevent re-contamination.
3. Confirmation during removal: Confirm that the HF EOP connector remains covered and protected throughout the entire process whenever it has been removed.
4. Confirmation during service: Ensure the connector is continuously covered and protected while the vehicle is undergoing any service.

Important Information for Owners

Owners should be aware of the following notice provided in the TSB:

NOTICE
A Technical Service Bulletin is a field fix repair program without customer notification that may be
performed during the warranty period. Any dealer requesting to perform this repair outside the
warranty period will require DPSM approval.

This means that Kia is not directly notifying vehicle owners about this particular service bulletin. It is considered a