Restore Full Electrical Control to Your GM Truck
If you’re battling frustrating electrical issues in your 2013 GMC Sierra 3500 or another compatible GM vehicle, a failing Body Control Module (BCM) is often the culprit. As the central command for your truck’s body electronics, a faulty BCM can cause a cascade of problems that seem unrelated, from flickering lights to a non-responsive climate control system. This OEM-quality BCM, equivalent to part number 15926094, is the definitive solution. We pre-program it to your vehicle’s specific VIN, ensuring it works perfectly right out of the box, with no expensive dealership programming required.
From the Diagnostic Bay: The Ghost in the Machine
I once had a 2011 Silverado 2500 in my shop with a classic “ghost in the machine” complaint. The owner reported intermittent stalling, random security light warnings, and the radio cutting out. He’d already replaced the battery and checked the alternator. My initial scan showed a slew of communication codes. After two hours of tracing wires, I focused on the BCM. A simple wiggle test of the main connector caused all the symptoms to appear at once. The problem wasn’t the module itself, but a poor ground connection near the BCM mounting point. This is why I always tell my customers: when you replace your 2013 Sierra 3500 BCM, take an extra minute to clean the grounding points. It’s the best way to ensure your new part works flawlessly for years to come.
Is Your Sierra Showing These Telltale BCM Failure Signs?
A failing BCM can manifest in numerous ways. If you’re experiencing any of the following, this module is your likely fix:
- ✔ Intermittent or completely dead power windows, door locks, or interior lights.
- ✔ The HVAC system or blower motor works sporadically or not at all.
- ✔ An active airbag warning light, often accompanied by Diagnostic Trouble Code (DTC) B1001.
- ✔ Erratic security system behavior, leading to no-start conditions or stalling.
- ✔ Unexplained battery drain or communication errors between modules.
- ✔ Wipers or exterior lights activating on their own or failing to turn on.
Your 5-Minute BCM Installation Guide
Getting your truck back to normal is a straightforward process that most DIYers can complete in their driveway. No complex procedures or special tools are needed for the physical swap.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the BCM: On most GM trucks and SUVs, the BCM is located under the driver’s side dashboard, near the steering column. You may need to remove a lower dash panel for access.
- Swap the Module: Carefully unplug the electrical connectors from the old BCM. Release any clips or bolts holding it in place, remove it, and install the new module in its place.
- Reconnect and Test: Securely plug all connectors into your new BCM. Reconnect the battery terminal and start the vehicle. Test all functions like lights, locks, windows, and wipers to confirm the repair.
- Post-Install Check: In some cases, an airbag light may persist. This requires a professional scan tool to perform the “Setup SDM Primary Key in BCM” function to sync the systems. See our FAQ for more details.
Verified Fitment for Your GM Truck or SUV
This module is a direct replacement for part number 15926094 and is interchangeable with several other part numbers including 25835966, 20939137, and 22860591. It provides guaranteed compatibility for a wide range of vehicles:
ESCALADE 07-11
ESCALADE ESV 07-11
ESCALADE EXT 07-11
SIERRA 1500 PICKUP 07-11 (07 new style, smooth door skin)
SIERRA 2500 PICKUP 07-13 (07 new style, smooth door skin)
SIERRA 3500 PICKUP 07-13 (07 new style, smooth door skin)
SIERRA DENALI 07-11 (07 new style, smooth door skin)
SIERRA DENALI 2500 11-13
SIERRA DENALI 3500 11-13
SILVERADO 1500 PICKUP 07-11 (07 new style, smooth door skin)
SILVERADO 2500 PICKUP 07-13 (07 new style, smooth door skin)
SILVERADO 3500 PICKUP 07-13 (07 new style, smooth door skin)
SUBURBAN 1500 07-11
SUBURBAN 2500 07-11
TAHOE 07-11
YUKON 07-11
YUKON XL 1500 07-11
YUKON XL 2500 07-11
Frequently Asked Questions About the 2013 Sierra 3500 BCM
Frequently Asked Questions
Is this BCM ready to install right out of the box?
Yes. We program the module to your vehicle’s VIN before shipping. This ensures it is ready for plug-and-play installation, eliminating the need for a trip to the dealership.
What if my airbag light is still on after installing the new BCM?
This is a common security feature. You will need a professional-grade scan tool to access the BCM’s special functions and perform the ‘Setup SDM Primary Key in BCM’ procedure. This syncs the airbag system to the new BCM and turns off the light.
Do I need to return my old BCM? Is there a core charge?
No. We do not require you to return your old part. There is absolutely no core charge, making the process simple and hassle-free.
Will this part fix my intermittent climate control and blower fan?
Yes, in most cases. The BCM directly controls the HVAC system’s power and logic. A failing module is a very common cause of intermittent or non-functional climate controls in these GM trucks.
What other procedures might be needed after installation?
Depending on your specific model and options, a Brake Pedal Position (BPP) sensor relearn might be necessary to ensure proper brake light and traction control operation. This can also be done with a capable scan tool.