Restore Your Van’s Electrical System with a Plug-and-Play Solution
If you’re dealing with bizarre electrical issues in your 2008-2012 GMC Savana 3500 Van—like power windows that won’t cooperate, interior lights with a mind of their own, or a security system that acts up—you’re not alone. These frustrating problems often point directly to a failing Body Control Module (BCM). The BCM is the central command for your vehicle’s body electronics, and when it falters, it can create a cascade of confusing and annoying symptoms. This replacement BCM, part number 20935349, is the reliable, straightforward fix you need to get your workhorse van back in top form.
Case Study: The Ghost in the Work Van
I once had a fleet customer bring in a Savana 3500 with a list of electrical complaints that seemed completely unrelated. The radio would randomly shut off, the power door locks would cycle while driving, and the battery would be dead every few mornings. The driver was convinced the van was haunted. We spent hours checking for wiring shorts and bad grounds, but everything looked solid. On a hunch, I connected our diagnostic scanner and monitored the BCM data stream. We saw erratic commands being sent even with all switches off. It was a classic case of internal BCM failure. Swapping it with a properly programmed module solved every single issue instantly. It’s a perfect example of how one single component can wreak havoc on a vehicle’s entire electrical system.
Is Your Savana Van Exhibiting These Issues?
A failing BCM can manifest in numerous ways. If you’re noticing any of the following, it’s a strong indicator that your BCM needs attention:
- ✔ Erratic or non-functional power windows, door locks, or mirrors.
- ✔ Interior or exterior lights staying on, flickering, or not working at all.
- ✔ The security system or keyless entry failing to operate correctly.
- ✔ The horn sounding unexpectedly or not working when pressed.
- ✔ Intermittent issues with the radio or instrument cluster displays.
- ✔ Communication error codes, such as U0140 (Lost Communication With Body Control Module).
- ✔ Unexplained parasitic battery drain that kills your battery overnight.
The Reliable Fix for Your 2008-2012 Savana 3500 BCM
Don’t let a faulty module keep your van off the road. Our replacement 2008-2012 Savana 3500 BCM arrives at your door ready for installation. We take the hassle out of the process by pre-programming the module to your van’s specific Vehicle Identification Number (VIN). This ensures all factory-set options and security protocols are correctly configured, saving you a costly trip to the dealership. We flash it with the latest GM software updates, so you’re getting a component that not only fixes the current problems but also incorporates the most recent stability and performance improvements from the manufacturer. Best of all, there is absolutely no core charge—you can keep your old part.
Your Straightforward BCM Installation Guide
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- ✔ Locate the BCM: On the Savana/Express vans, the BCM is typically located in the center dash area. You may need to remove a few dash panels for access.
- ✔ Disconnect and Remove: Carefully unplug the electrical connectors from the old BCM. They have locking tabs that must be depressed. Once disconnected, unbolt or unclip the module from its mounting bracket and remove it.
- ✔ Install the New Module: Mount your new, pre-programmed BCM in the same location and securely reconnect all the electrical harnesses. Ensure they click into place.
- ✔ Reconnect Power: Re-attach the negative battery terminal.
- ✔ Perform Relearns (If Needed): Start the vehicle and check all functions. In some cases, you may need a professional scan tool to perform a ‘Setup SDM Primary Key in BCM’ if the airbag light is on, or a ‘Brake Pedal Position Relearn’ for the traction control system.
Confirmed Vehicle Compatibility
This Body Control Module is a direct fit for a wide range of GM vehicles and is a replacement for numerous part numbers. While this listing is for the 2008-2012 Savana 3500 BCM, it also fits the following models. Please verify your part number or contact us with your VIN to confirm compatibility.
Disclaimer: Specific procedures and compatibility can vary. Always consult a factory service manual or a qualified technician for guidance.
Frequently Asked Questions
What do I need to do after I purchase?
After you place your order, you must provide us with your vehicle’s 17-digit VIN. We need this to program the module specifically for your van’s features and security system before we can ship it.
Is this a plug-and-play part?
Yes, for most vehicles. Because we pre-program it to your VIN, it eliminates the need for dealer programming. However, as noted, some models may require a simple relearn procedure for the airbag or brake pedal position sensor, which requires a professional scan tool.
Do I need to return my old BCM?
No. There is no core charge for this part. You can keep your original module, which is helpful if you ever need to reference old part numbers.
Will this fix my parasitic battery drain?
A failing BCM is a very common cause of parasitic battery drain in these GM vans, as it may not be letting other modules ‘go to sleep’. While this part often resolves the issue, you should always have the drain professionally diagnosed to confirm the BCM is the root cause.
What if my airbag light comes on after installation?
This indicates the new BCM needs to be synced with the airbag’s Sensing and Diagnostic Module (SDM). A qualified technician with a high-level scan tool can perform the ‘Setup SDM Primary Key in BCM’ procedure to resolve this.