If you’re dealing with the frustrating and unpredictable electrical issues that plague a failing Body Control Module (BCM), you’ve come to the right place. As a technician with over two decades of experience, I’ve seen firsthand how a faulty BCM can turn a reliable workhorse like a Savana van into a source of constant headaches. This isn’t just a part; it’s the solution to restoring order to your vehicle’s electronic systems.
The BCM is essentially the central command for your vehicle’s body accessories. It controls everything from your power windows, door locks, and interior lighting to the security system and instrument cluster warnings. When it starts to fail, the symptoms can be maddeningly intermittent and difficult to diagnose. This is where our service provides a decisive advantage.
We offer a replacement Body Control Module, part number 20935349, that arrives at your doorstep fully programmed to your vehicle’s specific VIN. We install the latest GM-certified software, ensuring all functions operate exactly as the factory intended. This eliminates the need for an expensive trip to the dealership for programming, saving you both time and hundreds of dollars in labor and tool fees. It’s the most direct path to getting your van back in service.
A Technician’s Notebook: The Case of the Haunted Work Van
I once had a 2011 Savana 1500 come into the bay that was driving the owner, a local contractor, crazy. The dome lights would stay on, the power locks would work one minute and not the next, and the security light would flash randomly, sometimes causing a no-start condition. He had already replaced the battery and checked all the fuses. After connecting my scan tool, I found multiple ‘U’ codes, indicating communication loss with the BCM. Instead of a lengthy and costly diagnostic chase, we installed a pre-programmed BCM. In under an hour, every single issue was resolved. It’s a classic failure pattern, and this part is the definitive fix.
Common Symptoms of a Failing GM BCM
Not sure if the BCM is your problem? If your vehicle is experiencing several of the following issues, a faulty Body Control Module is the most likely culprit:
- ✔ Erratic or non-functional power windows and door locks.
- ✔ Interior or exterior lights staying on or not turning on at all.
- ✔ The security system engaging randomly, preventing the engine from starting.
- ✔ False warning lights on the instrument cluster (e.g., airbag, ABS, traction control).
- ✔ Horn sounding unexpectedly or not working when pressed.
- ✔ Communication-related Diagnostic Trouble Codes (DTCs), such as U0140, U0155, or other ‘U’ codes.
Your Straightforward BCM Installation Guide
Installing your new 2008-2012 Savana 1500 BCM is a manageable job for a DIYer with basic tools. While the exact location can vary slightly by model, it’s typically found in the center dash area on Savana and Express vans.
- 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 most Savana/Express models, you’ll need to remove a few dash panels around the center console or glove box area to access the module.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be depressed. Once disconnected, unbolt the old BCM from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed BCM into place and securely reconnect all the electrical connectors. You should hear a ‘click’ as they lock in.
- Reconnect and Test: Reconnect the negative battery terminal. Turn the key to the ‘On’ position and test all functions: windows, locks, lights, etc. Note that some post-install procedures may be required (see below).
Important Post-Installation Note: Depending on your vehicle’s specific options, a couple of additional steps might be necessary. If your airbag light is on, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure. Similarly, a ‘Brake Pedal Position Relearn’ might be required. Always consult a factory service manual for your specific vehicle if you are unsure.
Verified Fitment For These GM Vehicles
This BCM is a direct replacement for part number 20935349 and is interchangeable with a wide range of other part numbers. It is guaranteed to fit the following vehicles (please verify your specific options):
Frequently Asked Questions
Do I need to send my old BCM back?
No, there is no core charge for this part. You can keep your original module.
Is this BCM really ready to install out of the box?
Yes. We program the module with the latest GM software using the VIN you provide during checkout. This ensures it’s matched to your vehicle’s specific configuration, making installation straightforward.
What information do you need from me to program it?
After you complete your purchase, you will need to provide us with your vehicle’s 17-digit VIN (Vehicle Identification Number). This is critical for correct programming.
What if my airbag light comes on after installation?
This is a known possibility. It means the new BCM needs to be synchronized with the airbag’s Sensing and Diagnostic Module (SDM). A procedure called ‘Setup SDM Primary Key in BCM’ must be performed with a professional-grade diagnostic tool to resolve this.
Will this fix my specific problem?
This module corrects issues directly caused by a failing BCM. While it resolves the vast majority of common electrical problems listed, it’s important to ensure your vehicle’s wiring and other components are in good condition. A proper diagnosis is always the best first step.