Fix Your Truck’s Electrical Headaches for Good

If you’re dealing with a cascade of bizarre electrical problems in your 2013 GMC Sierra, you’re not alone. As a technician with over two decades of experience, I’ve seen firsthand how a failing Body Control Module (BCM) can turn a reliable truck into a source of constant frustration. This isn’t just an inconvenience; it can affect vehicle safety and security. This OEM-quality Body Control Module, a direct replacement for part number 15284816 and others, is the definitive solution. It arrives expertly programmed to your truck’s specific VIN, eliminating the need for expensive dealership visits and ensuring a true plug-and-play repair.

The BCM is the central nervous system for your truck’s comfort and convenience features. It governs everything from your interior and exterior lights, power windows, and door locks to the HVAC system and security features. When it fails, the symptoms can be confusing and widespread. Our pre-programming service installs the latest GM software updates based on your VIN, ensuring all vehicle options are correctly configured right out of the box. This resolves common Diagnostic Trouble Codes (DTCs) and restores full functionality, getting you back on the road with confidence.

Is Your Sierra Exhibiting These Electrical Faults?

A failing BCM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement:

• ✔ Airbag warning light is illuminated on the dash, often with a DTC B1001 stored.
• ✔ Unresponsive or erratic HVAC controls, including a blower motor that won’t turn on or off.
• ✔ Power windows, door locks, or interior/exterior lights that work intermittently or not at all.
• ✔ The security system acts up, causing no-start conditions, stalling, or random alarm activation.
• ✔ A cluster of seemingly unrelated electrical issues that have no other obvious cause.

A Straightforward Guide to Installation

For most DIYers, installing this 2013 Sierra BCM is a simple job that takes less than 10 minutes. No complex wiring is required.

1. Safety First: Always disconnect the negative terminal from your vehicle’s battery before working on electrical components.
2. Locate the BCM: On most 2007-2013 GM trucks and SUVs, the BCM is located under the driver’s side dashboard, near the steering column. It’s typically held in a plastic bracket.
3. Swap the Module: Carefully unplug the electrical connectors from the old BCM. They have locking tabs that need to be depressed. Remove the old module and snap the new, pre-programmed one into place.
4. Reconnect and Test: Reconnect the electrical harnesses to the new module, ensuring they click securely into place. Reconnect the battery terminal. Start the vehicle and test all functions—lights, windows, locks, wipers, and HVAC—to confirm the repair.

Post-Installation Note: In some cases, if the airbag light was on, it may remain on after installation. This requires a ‘Setup SDM Primary Key in BCM’ procedure using a bi-directional scan tool to sync the new BCM with the airbag system. This is a simple function found in the ‘Special Functions’ menu of most professional scanners.

Verified Vehicle Compatibility

This module is engineered for a precise fit and function in a wide range of General Motors vehicles. It is interchangeable with part numbers 25835966, 15263363, 15263497, 15878753, 15284816, 15943678, 15926094, 15940214, 25790508, and many more. Please verify your part number or contact us with your VIN to ensure compatibility.