Fix Your GM Truck’s Electrical Gremlins for Good
If you’re dealing with bizarre electrical issues in your 2003-2007 GM truck or van, you’re not alone. Flickering lights, power windows with a mind of their own, a security light that won’t turn off, or a vehicle that refuses to start—these are classic signs of a failing Body Control Module (BCM). As the electronic nerve center for your vehicle’s comfort and convenience features, when the BCM starts to go, it can create a cascade of frustrating problems. This isn’t just an inconvenience; it can affect your vehicle’s security and reliability.
This replacement 2003-2007 GM BCM is the definitive solution. We take the guesswork and high cost out of the repair by programming the module specifically to your vehicle’s VIN before we ship it. This means no expensive trip to the dealership for programming. You get a part that’s ready for installation right out of the box, loaded with the latest GM software updates to ensure peak performance and reliability. It’s the smart, straightforward way to restore your truck or van to perfect working order.
Case Study: A Tricky Diagnosis
A customer brought in a 2006 Silverado 2500 with a complaint that stumped two other shops: the interior lights would randomly turn on while driving, and occasionally, the truck would crank but not start. There were no check engine lights, just a flashing security lamp. After checking the basics, my diagnostic scan tool showed multiple ‘Loss of Communication’ codes (U-codes) pointing to the BCM. These modules are notorious for failing due to internal solder joint cracks from years of vibration and heat cycles. We installed a VIN-programmed BCM, and all the phantom electrical issues vanished instantly. It’s a repair I’ve done hundreds of times, and it highlights how a single module can cause such widespread, confusing symptoms.
Is Your GM Truck or Van Showing These Symptoms?
A failing BCM can manifest in many ways. If you’re experiencing any of the following, this module is likely the culprit:
- ✔ Power windows, door locks, or mirrors not working or operating erratically.
- ✔ Interior dome lights or exterior lights staying on or not turning on at all.
- ✔ The horn sounding randomly or not working when pressed.
- ✔ A flashing security or anti-theft light on the dash, often causing a no-start condition.
- ✔ The radio or instrument cluster displays behaving strangely.
- ✔ Diagnostic trouble codes (DTCs) such as U0140, U0155, or B1001 stored in the system.
Your Straightforward BCM Installation Guide
Installing your new BCM is a manageable job for a DIYer with basic tools. The location varies by vehicle type, so confirm yours before you begin.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes to ensure all systems are powered down.
- Locate the BCM: On Silverado and Sierra pickups, it’s typically located under the driver’s side of the dashboard, near the steering column. For Express and Savana vans, it’s usually found behind the center dash panel.
- Remove Trim Panels: Carefully remove any plastic trim or panels necessary to access the module. These are often held by clips or a few screws.
- Disconnect and Remove: The BCM has several multi-pin electrical connectors. Depress the locking tabs on each connector and gently pull them straight out. Once all connectors are removed, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed BCM into place. Reconnect all electrical connectors, ensuring they click securely into position.
- Reassemble and Test: Reinstall the trim panels, reconnect the battery terminal, and start the vehicle. Test all functions like lights, locks, and windows to confirm the repair.
Important Post-Installation Steps
While this module is programmed for your VIN, some vehicle systems may require a ‘handshake’ with the new BCM. Be aware of the following potential procedures:
- Airbag System Sync: If the airbag warning light is illuminated after installation, a professional scan tool is needed to perform the “Setup SDM Primary Key in BCM” procedure. This syncs the airbag system with the new BCM.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor relearn may be required to ensure correct brake light and traction control operation.
Disclaimer: Always consult a factory service manual or a qualified technician for procedures specific to your vehicle.
Verified Fitment For These GM Models
This module is a direct replacement for a wide range of popular GM trucks, vans, and the SSR. It is compatible with the following part numbers: 15167329, 15194169, 15747545, 15136224, 15116065, 15198115, 15136876, and 10367689.
Chevrolet Express & GMC Savana Vans (2003-2007):
- Fits 1500, 2500, and 3500 models. For 2004-2007 models, this fits vans without the commercial tradesman package. The BCM is located in the center dash.
Chevrolet Silverado & GMC Sierra Pickups (2003-2007):
- Fits 1500, 2500, and 3500 models, excluding Crew Cab configurations.
- For 2007, this fits the ‘Classic’ body style (identified by a creased door skin).
- Compatibility may depend on transmission type (MT or AT with 4-speed opt MT1). Please check the original fitment data for specifics. The BCM is located under the steering column.
Chevrolet SSR (2003-2006):
- Fits all 2003-2006 SSR models.
Frequently Asked Questions
Do I need to program this BCM?
No. The biggest benefit of our service is that we program the module to your vehicle’s VIN before shipping it. It arrives ready to install, saving you a trip to the dealer.
What does a Body Control Module do?
The BCM acts as the central computer for your vehicle’s body electronics. It controls non-engine related functions like power windows, locks, interior/exterior lights, the security system, wipers, and more.
Where is the BCM located on my 2005 Silverado?
On Silverado and Sierra pickups from this era, the BCM is located under the driver’s side dashboard, typically attached to a bracket near the steering column. On Express and Savana vans, it’s in the center of the dash.
Is there a core charge for my old part?
No, there is absolutely no core charge. You can keep your original module without any extra fees or the hassle of sending it back.
How do I provide my VIN for programming?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We cannot process and program your order without it. We will provide clear instructions on how to send it to us.
What if my airbag light comes on after installation?
This is not uncommon. It simply means the new BCM needs to be electronically introduced to the airbag system (SDM). A procedure called “Setup SDM Primary Key in BCM” needs to be performed with a bi-directional scan tool to resolve this.