2020-2026 Encore GX & Trailblazer Keyless Entry Bracket: Solving Part Number Confusion

Symptoms of a Failing Keyless Entry Module Bracket

A bracket itself doesn't have electronic symptoms, but its failure can cause them. If your keyless entry module bracket is broken, bent, or missing, the module it's supposed to hold will be loose. This can lead to both physical and electrical issues.

• Rattling or Buzzing from the Dashboard: This is the most direct symptom. You may hear a persistent rattling or plastic buzzing sound, especially when driving on rough roads. This is the sound of the loose keyless entry module vibrating against the dashboard, trim panels, or other components.
• Intermittent Keyless Entry Function: If the module is not secure, its electrical connector can wiggle loose with vehicle vibrations. This can cause the keyless entry system to work one moment and fail the next. You might find your key fob buttons or passive entry (the button on the door handle) work sporadically.
• "No Remote Detected" Message: A loose connection can prevent the vehicle from detecting the key fob, even when it's inside the car. This may trigger a "No Remote Detected" or "Place key in transmitter pocket" message on the driver information center (DIC) and prevent you from starting the vehicle.
• Complete Keyless Entry Failure: In some cases, the constant vibration could damage the module's connector pins or internal circuit board, leading to a total loss of keyless entry functions.

Known Issues, TSBs, and Recalls

While there are no recalls or TSBs specifically for this bracket, there are several service bulletins related to the keyless entry system that owners of the 2020-2026 Buick Encore GX and 2021-2024 Chevrolet Trailblazer should be aware of.

• TSB 18-NA-279: As mentioned above, this bulletin addresses the passive door unlocking feature becoming inoperative. This can happen if the lock and unlock buttons on the fob are pressed together for several seconds, which is a designed feature, not a fault. The solution is to press and hold both buttons again to toggle the feature back on.
🎬 See this video on fixing the passive door unlock button
• TSB for Inoperative Fobs: A GM service bulletin from December 2021 addresses an issue where key fobs may be inoperative for passive entry and starting right from the factory due to invalid data. The fix requires a dealer to reprogram all fobs to the vehicle.

Buying a Used Keyless Entry Control Module Bracket

This is THE most important section of this guide. Due to confusing part numbering by GM, it is very easy to order the wrong bracket. A used OEM bracket is an excellent, low-cost choice, provided you buy the correct one and inspect it properly.

Part Number Identification: The Critical Step

Three different bracket part numbers are commonly associated with these vehicles, but only one is correct for the keyless entry module. Do not rely on the part title alone; verify the part number and appearance.

Part Number	Appearance	Description & Notes
42699638		THIS IS THE CORRECT PART. It is a small, simple stamped metal bracket. It is correctly listed in parts catalogs as the "Keyless Entry Components-Module Bracket" and fits both the 1.2L and 1.3L engine models of the Encore GX and Trailblazer.
42766894		DO NOT BUY THIS PART for the keyless entry module. This is a larger, more complex bracket. Parts catalogs specify it is for vehicles with the "1.3L turbo" engine. This is believed to be the mounting bracket for the Engine Control Module (ECM), not the keyless entry module.
42483716		DO NOT BUY THIS PART for the keyless entry module. This is often listed as a generic "Controller Bracket." Its exact application is unclear, but it may be for an HVAC module. It is not the correct bracket for the keyless entry system.

Physical Inspection Checklist

When buying a used bracket, check for the following:

• No Cracks or Bends: Inspect the bracket carefully for any signs of stress fractures or bending. A bent bracket may not align with the mounting holes on the chassis or the module.
• Intact Mounting Points: Ensure all mounting tabs and screw holes are intact and not stripped or broken.
• Minimal Corrosion: Light surface rust is usually not a concern, but avoid any bracket with heavy or flaking rust that could compromise its structural integrity.

Cost Comparison

The bracket itself is inexpensive, but the labor to access it can be significant. This makes ensuring you have the right part before starting the job even more important.

Installation and Replacement Guide

Replacing the keyless entry module bracket requires accessing the module itself. The difficulty is low, but it requires patience to remove interior trim panels without causing damage.

• Difficulty: 2/5 (Requires basic hand tools and careful removal of trim)
• Estimated Time: 1 - 1.5 hours
• Tools Needed: Socket set, trim removal tools, Phillips head screwdriver.

Location

The location of the keyless entry module (and its bracket) can differ between models.

• For the Chevrolet Trailblazer, the module is typically located behind the dashboard on the passenger side (RH side). Access is usually gained by removing the glove box assembly.
🎬 Watch: How to remove the Trailblazer glove box
• For the Buick Encore GX, some data suggests the module is in the engine compartment, while other sources indicate a similar RH dash location. It is recommended to first check behind the glove box, as this is a more common location for this type of electronic component.

General Replacement Steps

1. Disconnect the Battery: Before working on any vehicle electronics, disconnect the negative terminal of your car's 12V battery.
2. Access the Module: For a dashboard location, start by opening and emptying the glove box. Release the glove box stops to allow it to swing down completely, then unhook it from its hinges. You may need to remove additional lower dash trim panels to get a clear view.
3. Locate the Module and Bracket: Look for a small black plastic box (the module) attached to a metal bracket, which is then bolted to the vehicle's frame or a support beam.
4. Remove the Old Bracket: Unplug the electrical connector from the module. Unbolt the bracket from the chassis, and then unbolt the module from the bracket.
5. Install the New Bracket: Mount the module to your new (and correct!) bracket first. Then, bolt the entire assembly back into the vehicle. Reconnect the electrical connector, ensuring it clicks securely into place.
6. Reassemble and Test: Reinstall the glove box and any trim panels you removed. Reconnect the vehicle's battery and test all functions of your keyless entry system.

Frequently Asked Questions (FAQ)