If you’re dealing with bizarre electrical issues in your truck—like power windows with a mind of their own, flickering dash lights, or a security system that won’t cooperate—you’re likely facing a failing Body Control Module (BCM). As the central command center for your vehicle’s body electronics, a faulty BCM can turn your reliable workhorse into a source of constant frustration. I’ve seen it countless times in my 20+ years in the shop: what seems like multiple, unrelated electrical problems often traces back to this single component.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the biggest headache out of the repair by programming this BCM specifically to your truck’s Vehicle Identification Number (VIN) before it ships. This means you can bypass the expensive trip to the dealership for programming. You get a fully functional module, loaded with the latest GM software, that’s ready to restore order to your vehicle’s electronics right out of the box.
Case Study: A Tricky Diagnosis
A customer brought in his 2013 Sierra 2500 with a complaint that stumped two other shops. The interior lights would randomly pulse, the radio would shut off, and the ‘Service 4WD’ message would appear intermittently. They had already replaced the battery and alternator. A scan showed a handful of U-codes (communication errors), pointing to a network issue. Instead of chasing ghosts, we went straight to the BCM. After swapping in a new module, every single symptom disappeared. It’s a classic example of how a failing BCM can mimic multiple other component failures, making it a critical part to check for widespread electrical gremlins.
Is Your Truck Showing These Symptoms?
A failing BCM can cause a wide range of issues. If you’re experiencing any of the following, this module is the likely solution for your 2012-2013 Sierra BCM problems:
- ✔ Erratic or non-functional power windows, door locks, or mirrors.
- ✔ Interior or exterior lights that stay on, flicker, or don’t work at all.
- ✔ The security system or keyless entry malfunctioning.
- ✔ Wipers activating on their own or not working when needed.
- ✔ False warnings on the instrument cluster (e.g., ‘Service StabiliTrak’, ‘Service Airbag’).
- ✔ Diagnostic trouble codes (DTCs) related to communication, such as U0140, U0155, or other U-codes.
- ✔ Complete loss of power to multiple accessory systems.
A Straightforward Guide to Installation
With our pre-programming service, the physical installation is a job most DIYers can handle. The BCM is typically located under the driver’s side of the dashboard.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Access the Module: Remove the lower dash panel beneath the steering column to expose the BCM and its wiring harnesses.
- Disconnect and Remove: Carefully unplug all electrical connectors from the old BCM. They have locking tabs that need to be depressed. Once disconnected, unbolt or unclip the old module from its mounting bracket.
- Install the New BCM: Mount your new, pre-programmed BCM in the same location and securely reconnect all the electrical harnesses. Ensure each plug clicks firmly into place.
- Reconnect Power: Re-attach the lower dash panel and then reconnect the negative battery terminal.
- Perform Final Checks: Start the vehicle and test all body functions—windows, locks, lights, wipers, etc. Note the post-installation procedures below, as some relearn steps may be necessary.
Important Post-Installation Notes
While we handle the main programming, some vehicle systems may require a simple sync or relearn procedure after the new 2012-2013 Sierra BCM is installed:
- Airbag System Sync: If the airbag light is on after installation, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure. This syncs the new BCM with the airbag system.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor relearn may be required to ensure correct brake light operation and traction control function.
- No Core Charge: You are not required to return your old module. This saves you time and the hassle of a core deposit.
Disclaimer: Vehicle systems can vary. We always recommend consulting a factory service manual or a qualified technician if you are unsure about any step.
Verified Vehicle Compatibility
This Body Control Module is a direct-fit replacement for part numbers 22846364, 22737275, and 22846365. It is guaranteed to fit the following GM trucks and SUVs:
- ✔ Cadillac Escalade, Escalade ESV, Escalade EXT (2012-2014)
- ✔ Chevrolet Avalanche 1500 (2012-2013)
- ✔ Chevrolet Silverado 1500, 2500, 3500 (2012-2014)
- ✔ Chevrolet Suburban 1500, 2500 (2012-2014)
- ✔ Chevrolet Tahoe (2012-2014)
- ✔ GMC Sierra 1500, 2500, 3500 (2012-2014)
- ✔ GMC Sierra Denali 1500, 2500, 3500 (2012-2014)
- ✔ GMC Yukon, Yukon XL 1500, Yukon XL 2500 (2012-2014)
Frequently Asked Questions
Do I really need to provide my VIN?
Yes, providing your VIN is essential. We use it to load the exact, correct software and configurations for your truck’s specific options, ensuring a true plug-and-play installation and preventing compatibility issues.
What does ‘pre-programmed’ mean for me?
It means you can skip the expensive and time-consuming trip to a dealership or mechanic for programming. The module arrives ready to be installed and function correctly with your vehicle’s systems.
Is this part difficult to install myself?
The physical replacement is straightforward for most DIYers with basic tools. It involves removing a dash panel and swapping the module. The most complex part, the programming, is already done for you.
What if my airbag light comes on after I install it?
This is a known possibility. It simply means the new BCM needs to be electronically ‘introduced’ to the airbag module. A shop with a professional-grade scan tool can perform the ‘Setup SDM Primary Key’ procedure in a few minutes to resolve this.
Do I have to send my old BCM back?
No. This purchase has no core charge. You can keep your old part, which saves you the cost and hassle of return shipping.