Restore Control and Eliminate Electrical Headaches in Your GM Truck
If you’re dealing with bizarre and frustrating electrical issues in your 2006-2007 Sierra or Silverado HD, you’re not alone. Flickering interior lights, power windows with a mind of their own, a security light that won’t turn off, or a truck that refuses to start can all point to a single, critical component: a failing Body Control Module (BCM). As the central command center for your truck’s body electronics, a faulty BCM can wreak havoc on your daily drive. This replacement BCM, part number 15107479, is the definitive solution, arriving pre-programmed with the latest GM software specifically for your vehicle’s VIN.
A customer brought his 2006 Silverado 2500 into my shop with a laundry list of complaints. The radio would randomly shut off, the dome light would flicker while driving, and occasionally, the truck wouldn’t crank. He’d already replaced the battery and checked the alternator. After hooking up my scan tool, I found a series of communication codes, including a U0140 (Lost Communication With Body Control Module). Experience told me this wasn’t a wiring issue; it was the BCM itself failing internally. We installed a VIN-programmed module just like this one, and every single one of his electrical gremlins vanished. It’s a common failure on these otherwise reliable trucks, and this is the most direct fix.
Is Your Truck Showing These Symptoms?
- ✔ Power windows or door locks operating erratically or not at all.
- ✔ Interior or exterior lights flickering, staying on, or not working.
- ✔ The anti-theft or security light is illuminated, preventing the engine from starting.
- ✔ Gauges on the instrument cluster behaving erratically or going dead.
- ✔ The radio or climate control system randomly turns on or off.
- ✔ Diagnostic Trouble Codes (DTCs) related to communication errors, such as U0140, U0155, or U0164.
- ✔ A ‘Service 4WD’ or other warning messages appearing on the driver information center.
Your Straightforward BCM Installation Guide
Installing your new BCM is a manageable job for a DIYer with basic tools. The key is that we handle the complicated programming for you. Just follow these steps to get your truck back in order.
- Safety First: Always disconnect the negative terminal from your truck’s battery and wait about 10 minutes to allow the systems to fully power down.
- Locate the BCM: On these GM trucks, the BCM is located under the driver’s side of the dashboard, typically to the left of the steering column. You may need to remove a lower dash panel for access.
- Disconnect the Old Module: The BCM has several large multi-pin electrical connectors. Carefully press the release tabs on each connector and pull them straight out. Note their colors and positions. The module itself is usually held in place by a few small bolts or clips.
- Install the New BCM: Mount your new, pre-programmed BCM in the same location as the old one. Securely reconnect all the electrical connectors into their corresponding ports. You’ll hear a click when they are fully seated.
- Reconnect and Test: Reinstall any trim panels you removed. Reconnect the negative battery terminal. Turn the key to the ‘On’ position and test your lights, locks, windows, and other accessories to confirm proper operation.
Important Post-Installation Notes
While this BCM is programmed to be as close to plug-and-play as possible, certain vehicle security and safety systems may require a final handshake after installation. Be aware of the following:
- Airbag System Sync: If your airbag warning light is on after installation, a simple procedure called ‘Setup SDM Primary Key in BCM’ is needed. This requires a professional-grade scan tool and 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 your brake lights and traction control system function correctly. This is also performed with a capable diagnostic tool.
Guaranteed Fitment for Your GM HD Truck
This Body Control Module is a direct-fit replacement for the following vehicles, provided they are Crew Cab models equipped with the 6-speed automatic transmission (RPO code MW7). Please verify your vehicle’s specifications before ordering.
- 2007 GMC Sierra 2500 & 3500 Pickup: Classic Style only (identified by the creased door skin).
- 2007 Chevrolet Silverado 2500 & 3500 Pickup: Classic Style only (identified by the creased door skin).
- 2006 GMC Sierra 2500 & 3500 Pickup
- 2006 Chevrolet Silverado 2500 & 3500 Pickup
Frequently Asked Questions
What does a Body Control Module (BCM) do?
The BCM acts as the central computer for your truck’s comfort and convenience features. It controls functions like power windows, door locks, interior/exterior lighting, the security system, and the instrument cluster.
Why do you need my VIN?
We require your Vehicle Identification Number (VIN) to program the BCM with the exact software and settings for your truck’s specific options. This ensures compatibility and proper function, saving you a trip to the dealer for programming.
Is this BCM difficult to install?
The physical installation is straightforward for most DIYers, involving removing a dash panel and swapping electrical connectors. The most difficult part—the programming—is already done for you before we ship it.
What if my airbag light is on after I install it?
This can happen. It simply means the new BCM needs to be electronically introduced to the airbag module. A mechanic with a professional scan tool can perform the ‘Setup SDM Primary Key in BCM’ procedure in a few minutes to resolve this.
Do I need to send my old BCM back?
No, there is no core charge for this part. You can keep your original module.