2025 Lexus UX300h Gateway Module: Part Numbers, Programming, and Replacement Guide

Symptoms of a Failing Serial Data Gateway Module

A failing gateway module can cause a wide range of seemingly unrelated electronic issues. Because it's a central communications hub, its failure often looks like multiple other parts have failed simultaneously.

• Multiple Warning Lights: The most common symptom is a dashboard that lights up with numerous, unrelated warnings like "Check Engine," "ABS Malfunction," "Pre-Collision System Malfunction," and others. This happens because the modules that control these systems can no longer communicate with the rest of the vehicle.
• Loss of Electronic Features: You may experience intermittent or total failure of features like the radio, climate control, power windows, or the main infotainment display.
• Communication-Related DTCs: A professional scan tool will likely show multiple Diagnostic Trouble Codes (DTCs), especially "U-codes" which indicate a loss of communication between modules. For example, you might see codes like U0100 (Lost Communication with ECM) or others indicating a failure to communicate with the ABS, steering, or body control modules.
• No-Start Condition: In some cases, a failed gateway module can prevent the vehicle from starting. The immobilizer system may not be able to verify the key, or the engine computer may not receive the signal to start.
• Blank Instrument Panel Display: The entire instrument cluster may go dark or fail to initialize at startup.

Known Issues, TSBs, and Recalls for the 2025 Lexus UX300h

As a relatively new model, long-term issues are still emerging. However, some early service campaigns and recalls have been issued.

• Recall 24V-587 (August 2024): Affects 141 vehicles produced between January 9 and January 17, 2024. A main engine room wire harness may have been misrouted, potentially leading to fractured wires and a sudden loss of driving power. This is not a failure of the gateway module itself but involves vehicle wiring.
• Recall 26V341 (May 2026): Affects a wider range of Toyota and Lexus vehicles, including the 2025 UX Hybrid. The instrument panel may fail to display critical warnings. The fix is a software update performed by the dealer.
• Special Service Campaign 24LC02: While not specific to the gateway module, some 2023+ Lexus models, including the UX250h, have a known issue with the DCM (Data Communication Module or Telematics ECU) that can cause a "Communication module activation failed" message. This is a separate module from the main gateway but highlights the complexity of the vehicle's network.

Part Number Verification: 89111-76110 vs. 89111-76130

One of the most important steps in replacing this module is ensuring you have the correct part number. You may find conflicting information, so it's crucial to understand the difference.

• 89111-76110: This is the part number often found on the original module installed in the vehicle from the factory.
• 89111-76130: This is the official replacement part number specified in Lexus parts catalogs for the 2025 UX300h.

Part number 89111-76130 is a supersession, meaning it is the newer, updated version intended to replace the older 89111-76110. When purchasing a replacement, you should always order the part number specified by an official Lexus parts catalog based on your vehicle's VIN. While a used module with the -76110 number might work, the -76130 is the correct and updated service part.

Buying a Used Serial Data Gateway Module

Given the high cost of a new OEM module, a used unit from a reputable automotive recycler is often the most cost-effective solution. However, there are critical factors to consider.

• Why Used OEM is a Smart Choice: For a complex electronic component like a gateway module, a used Original Equipment Manufacturer (OEM) part is superior to non-existent or unproven aftermarket alternatives. It is designed specifically for your vehicle's systems.
• Physical Inspection: When you receive the part, inspect the housing for any cracks or signs of physical damage. Most importantly, check the connector pins for any signs of corrosion, which could indicate water damage. Do not install a module that shows any evidence of water intrusion.
• Verify Compatibility: Double-check that the part number matches what is required for your vehicle's VIN. While two modules may look identical, they can have different internal firmware programmed for different vehicle options.
• Source Matters: Purchase from a seller that offers a warranty and has a good reputation. Avoid parts from vehicles with flood damage, as water can cause hidden, long-term electronic problems.

Installation and Programming Requirements

Replacing the gateway module is a two-step process: physical installation and electronic programming. While the physical swap may be straightforward for a DIY mechanic, the programming is not.

1. Physical Installation: The gateway module is typically located in the cabin, often behind the glove box or in the driver's side footwell area. Disconnect the 12V battery before unplugging the old module and installing the new one.
2. Mandatory Programming: After installation, the module must be programmed to the vehicle. This process, sometimes called initialization or configuration, registers the new module to the car's VIN and teaches it which other control units are present on the network. Without this step, the module will not be able to route communications correctly, and you will still have errors.
3. Who Can Program It?: This procedure requires dealer-level diagnostic software, specifically Toyota/Lexus Techstream. 🎬 Watch: How to install Toyota Techstream software A Lexus dealership is the most reliable place to have this done. Some independent repair shops specializing in Toyota/Lexus vehicles may also have the necessary equipment and subscriptions. A general mechanic or locksmith will likely not be able to perform this programming.

Cost Breakdown

The cost to resolve a gateway module issue can vary significantly based on the parts and labor source.

Frequently Asked Questions (FAQ)