Is Your GM Vehicle Plagued by Electrical Gremlins?
If you’re dealing with flickering lights, malfunctioning power windows or locks, a parasitic battery drain, or strange warning messages on your dash, the culprit is often a failing Body Control Module (BCM). The BCM is the central nervous system for your vehicle’s body electronics, coordinating everything from your interior lights and security system to your power accessories. When it fails, it can cause a wide array of frustrating and seemingly unrelated issues.
From the Diagnostic Bay
We had a 2011 Express work van come in that was killing batteries every two days. The owner had already replaced the battery and alternator. After checking for draws, we noticed the interior lights would faintly glow even when the van was off. A scan showed communication errors with the BCM. We installed a VIN-programmed module, and the parasitic draw vanished. The BCM wasn’t fully shutting down, keeping circuits active and draining the battery overnight. It’s a classic symptom that points directly to this module.
The Plug-and-Play Solution for Your Savana 3500 Body Control Module
Don’t let a faulty BCM keep your vehicle off the road or force you into an expensive trip to the dealership. This replacement Body Control Module is a direct-fit solution, arriving at your door fully programmed to your vehicle’s specific VIN. We flash it with the latest GM software updates, ensuring optimal performance and compatibility. This means no need for expensive scan tools or dealership appointments for programming—it’s ready for installation right out of the box.
Common Symptoms of a Failing BCM
- ✔ Intermittent or non-working power windows, door locks, or mirrors.
- ✔ Interior or exterior lights staying on or not turning on at all.
- ✔ The security system acting erratically or preventing the vehicle from starting.
- ✔ Unexplained battery drain that leaves you with a dead battery.
- ✔ False warning lights on the instrument cluster (e.g., “Service Theft System”).
- ✔ Horn honking randomly or not working when pressed.
- ✔ Wipers operating incorrectly or not parking in the correct position.
Installation and Post-Install Notes
Installation is typically straightforward, involving locating the old module (often under the dash), disconnecting the battery, swapping the electrical connectors, and mounting the new unit. After installation, please 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 new BCM with the airbag system.
- Brake Pedal Position Relearn: Some models may require a brake pedal position sensor relearn to ensure correct brake light and traction control operation.
This module is a guaranteed fit for a wide range of GM vehicles, including the Chevrolet Express, GMC Acadia, Cadillac DTS, Chevy Impala, and many more. Please verify your part number against the extensive list of compatible numbers provided.
Frequently Asked Questions
What does the Body Control Module (BCM) do?
The BCM is a computer that manages and controls many of your vehicle’s non-engine related electronic functions, such as power windows, locks, lights, wipers, security system, and other comfort and convenience features.
How do I provide my VIN for programming?
After you complete your purchase, you will need to send us a message with your vehicle’s 17-digit VIN. We cannot ship your part until we receive this information, as the programming is specific to your vehicle.
Is this part difficult to install?
For most DIY mechanics, the physical installation is straightforward. It usually involves removing a few dash panels to access the module and swapping connectors. The main benefit of our service is that the complex programming is already done for you.
Do I need to send my old BCM back?
No, there is no core charge for this part. You can keep your original module.
What if my airbag light comes on after I install it?
This can happen occasionally. It means the new BCM needs to be electronically introduced to the airbag system (SDM). A repair shop with a professional-grade scan tool will need to perform the ‘Setup SDM Primary Key in BCM’ procedure to resolve this.
Will this BCM fit vehicles other than the Savana van?
Yes, absolutely. This BCM is compatible with dozens of GM models, including the Chevy Express, Tahoe, Suburban, Impala, Cadillac Escalade, GMC Acadia, and more. Please check the detailed fitment list to confirm compatibility with your specific vehicle.