2025 Kia K4 Passenger Power Seat Module: Heating, Programming, and Replacement

Known Issues, TSBs, and Recalls for the 2025 Kia K4

As the Kia K4 is a new model, long-term reliability data is still emerging. However, early owners and official manufacturer communications provide some important context for anyone diagnosing electrical issues.

Vehicle-Specific Issues

• General Electrical Complaints: Some of the first 2025 K4 owners have reported various intermittent electrical problems on forums. These include issues with the infotainment system, door locks, and batteries that seem to drain unexpectedly. While not directly tied to the seat module, these reports suggest that, like many new models, the K4 may have early software and electrical system bugs that a dealer may need to address.
• Service Action for Other Kia Models: Kia has issued service actions for other new vehicles, like Service Action SA557 for the 2024 EV9. This action involved a software update to the Power Seat Module (PSM) to improve its logic. This indicates that Kia can and does issue software updates for these modules to fix operational problems, and a similar approach may be taken for the K4 if issues arise.
• Kia Telluride Power Seat Fire Risk Recall: While not for the K4, it's important to know that Kia recalled over 460,000 Telluride SUVs for a fire risk related to the power seat. In those vehicles, a stuck seat adjustment switch could cause the seat motor to overheat. This highlights the potential safety risk associated with any malfunctioning power seat component.

Official Recalls for the 2025 Kia K4

As of mid-2026, there are two official NHTSA recalls for the 2025 Kia K4. Neither directly involves the power seat module, but they are relevant to the vehicle's overall electrical system.

• NHTSA Campaign 26V046000: A software error can cause the main instrument panel display to fail, preventing the driver from seeing the speedometer or warning lights. The fix is a software update performed by the dealer or over-the-air (OTA).
• NHTSA Campaign 25V548000: Affecting a very small number of vehicles, this recall addresses improperly tightened engine connecting rod bolts that could cause a loss of power.

Symptoms of a Failing Power Seat Control Module

A problem with the passenger seat control module can manifest in several ways. Because it controls multiple functions, you may lose some features while others still work.

• Passenger Seat Heater Inoperative: The most common symptom for this specific module (88B70-GG000) would be a non-functional seat heater. The switch may light up, but the seat never warms up.
• Completely Dead Passenger Seat: If the module fails entirely, none of the power seat functions will work. The seat will not move forward, backward, or recline, and the heater will not turn on.
• Intermittent Operation: The seat may work sometimes and not others. This can be caused by a failing component inside the module, a loose connection, or a cracked solder joint.
• One Function Fails: You might find that the seat slides forward and back but won't recline, or vice-versa. This could point to a failure in a specific circuit within the module.
• Clicking Sound, No Movement: You may hear a 'click' from under the seat when you press a switch. This is often the sound of a relay inside the module trying to send power to a motor, but the motor itself isn't moving. This can indicate a problem with the module's output stage or the motor itself.

Diagnosing the Problem

Before replacing the module, follow these steps to confirm it's the source of the problem.

1. Check the Fuse: The first and easiest step is to check the fuse box. A single blown fuse can disable the entire power seat system. Consult your owner's manual to find the fuse panel and identify the fuse(s) for the power seats.
2. Inspect for Obstructions: Look under the seat to ensure no objects are jamming the seat tracks or have damaged the wiring.
3. Test the Switch: While less common, the adjustment switch itself can fail. If only one function is failing (e.g., recline), the switch is a possible culprit.
4. Check for Power at the Module: If you have a multimeter, you can unplug the electrical connector to the module and check for 12V power at the appropriate pins when the ignition is on. If power is going into the module but nothing is happening, the module itself is likely faulty.

Programming and Calibration Requirements

This is the most critical consideration when replacing an electronic module on a modern vehicle.

A replacement Power Seat Control Module on a 2025 Kia K4 will likely need to be programmed or configured by a Kia dealership.

While direct confirmation for the K4 is limited due to its newness, several pieces of evidence support this:

• Used parts sellers explicitly state that electronic modules may require dealer programming to function correctly.
• Kia has issued software updates for power seat modules on other models (like the EV9) that can only be performed by a dealer with their proprietary diagnostic tools (KDS).
• The module needs to communicate with the rest of the car's network and understand the specific options it is controlling (e.g., heating). This configuration is typically done through a programming procedure.

An independent shop with advanced diagnostic tools may be able to perform this programming, but a dealer visit is the most certain path. Do not assume a used module will be a simple plug-and-play replacement.

Buying a Used Power Seat Control Module

A used OEM module is an excellent, cost-effective alternative to a new part, especially since aftermarket options for a vehicle this new are nonexistent. However, you must be careful to buy the correct part.

• Match the Part Number Exactly: The only way to guarantee compatibility is to match the OEM part number. For this passenger-side heated seat module, the number is 88B70-GG000. Do not buy a module with a different number, even if it looks identical. Kia uses different modules for the driver's side, and for seats with different options like ventilation.
• Inspect the Connectors: When you receive the part, check that all plastic connector housings and metal pins are clean, straight, and free of corrosion or damage.
• Source from a Reputable Seller: Purchase from a seller that offers a warranty and a return policy. This gives you protection in case the part is dead on arrival.
• Factor in Programming Costs: Remember to include the potential cost of a dealer visit for programming when calculating your total savings. Call your local Kia dealer's service department beforehand to get a quote for programming a customer-supplied used module.

Cost Comparison

Prices can vary, but here is a general cost estimate for replacing the 2025 Kia K4 passenger seat control module:

Frequently Asked Questions (FAQ)