Are you chasing down frustrating electrical gremlins in your GM truck or SUV? One minute the power windows work, the next they don’t. The radio acts possessed, or worse, you’re getting random warning lights on your dash. Before you spend another weekend checking grounds and wiring, the culprit is likely a failing Body Control Module (BCM). As a technician with over 20 years of experience, I’ve seen how a faulty BCM can turn a reliable truck into a source of constant headaches. It’s the central command center for all your vehicle’s comfort and convenience features, and when it fails, chaos ensues.
This isn’t just a replacement part; it’s a complete solution. We take a genuine GM BCM and program it with the latest factory software, specifically matched to your truck’s Vehicle Identification Number (VIN). This means you can skip the expensive trip to the dealership for programming. The module arrives at your door ready for installation, saving you significant time and money. This is the most efficient way to restore the full functionality of your vehicle’s electronics and get back on the road with confidence.
A Technician’s Notebook: The Case of the Flickering Sierra
A customer brought in his 2013 Sierra 2500 with a complaint that made him sound crazy. “My dash lights flicker, my radio turns off, and sometimes my turn signals just stop working,” he said. He’d already replaced the battery and checked the alternator. When I connected my scan tool, I found a U0140 code: Lost Communication with Body Control Module. Instead of a wiring issue, my experience pointed straight to an internal BCM failure. We ordered one of these pre-programmed units. The install took less than an hour, and because it was already flashed to his VIN, all functions returned to normal immediately. It’s a textbook example of how this part provides a fast, reliable fix.
Common Signs of a Failing GM BCM
A faulty Body Control Module can manifest in numerous ways. If your truck is experiencing any of the following, a BCM replacement is the likely solution:
- ✔ Erratic or non-functional power windows, door locks, and mirrors.
- ✔ Interior or exterior lights that flicker, stay on, or won’t turn on at all.
- ✔ The security system acting up, or the key fob not working correctly.
- ✔ Warning messages on the instrument cluster, such as “Service StabiliTrak” or “Service Airbag.”
- ✔ Diagnostic Trouble Codes (DTCs) related to communication errors, like U0140, U0155, or other U-codes.
- ✔ The radio or infotainment system randomly turning on or off.
A Straightforward Guide to BCM Installation
Replacing the BCM on these GM trucks is a manageable job for a DIYer with basic tools. This module is located under the steering column for easy access.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes before starting work.
- Locate the Module: Remove the lower dash panel beneath the steering wheel to expose the BCM. It’s typically a black box with several large electrical connectors.
- Swap the BCM: Carefully unplug all electrical connectors. Note their orientation. Unbolt or unclip the old BCM and remove it. Install the new module in its place.
- Reconnect Everything: Securely plug all the electrical connectors back into the new BCM. Reinstall the lower dash panel.
- Power Up: Reconnect the negative battery terminal. Start the vehicle and test all functions—lights, locks, windows, radio, etc.
Important Post-Installation Note: In some cases, additional steps may be needed. If the airbag light is on, a professional scan tool is required to perform the “Setup SDM Primary Key in BCM” procedure. A Brake Pedal Position Relearn may also be necessary. These are simple procedures for any qualified shop.
Will This Fit My Truck or SUV?
This Body Control Module is a direct-fit replacement for a wide range of General Motors vehicles. Please verify your part number or match your vehicle from the list below. This unit is compatible with part numbers 22846365, 22737275, and 22846364.
- Cadillac Escalade, ESV, EXT: 2012-2014
- Chevrolet Avalanche 1500: 2012-2013
- Chevrolet Silverado 1500/2500/3500 Pickup: 2012-2014
- Chevrolet Suburban 1500/2500: 2012-2014
- Chevrolet Tahoe: 2012-2014
- GMC Sierra 1500/2500/3500 Pickup: 2012-2014
- GMC Sierra Denali 1500/2500/3500: 2012-2014
- GMC Yukon & Yukon XL 1500/2500: 2012-2014
Frequently Asked Questions
Do I need to send you my old BCM?
No, there is absolutely no core charge for this part. You can keep your original module.
How do I provide my VIN for programming?
After you complete your purchase, simply send us a message with your vehicle’s 17-digit VIN. We will program the module before shipping it to you.
Is this BCM truly plug-and-play?
Yes, for most vehicles. Because we program it to your VIN, it eliminates the need for dealer programming. However, as noted, some models may require a simple airbag sync or brake pedal relearn procedure with a scan tool if specific warning lights appear after installation.
What happens if I install it without programming?
An unprogrammed BCM will not function correctly. It can cause a no-start condition, incorrect feature operation, and set multiple diagnostic trouble codes. Our pre-programming service is essential for a successful repair.
Will this fix my “Service 4WD” message?
While a failing BCM can cause a variety of strange warning messages due to communication network issues, a “Service 4WD” message is more commonly related to the Transfer Case Control Module (TCCM) or a sensor in the 4WD system. It’s best to have the codes scanned to confirm the source of the fault.