Restore Your Van’s Electrical Stability and Get Back to Work
If your 2008-2012 Savana 1500 Van is experiencing a baffling array of electrical issues—from flickering dashboard lights and erratic power windows to frustrating no-start conditions—the root cause is often a failing Body Control Module (BCM). As the central command center for your vehicle’s body electronics, a faulty BCM can create chaos, making your reliable workhorse feel unpredictable. This isn’t just an annoyance; it can affect vehicle security, safety systems, and your ability to get the job done. This replacement BCM, part number 20935349, is the definitive solution to restore order.
We take the complexity out of the repair. Unlike a standard replacement that requires a trip to the dealership for expensive programming, this module comes with our professional Cloning Service. Simply provide us with your vehicle’s VIN at checkout. We will transfer the critical data from your original BCM to this replacement unit. This ensures seamless integration with your vehicle’s existing systems, making the installation process as close to plug-and-play as possible and preserving your original key and security information.
A Technician’s Notebook: The Case of the Haunted Work Van
I had a 2011 Savana 1500 roll into the bay last month that had its owner completely stumped. The complaint list was long: the radio would turn on and off by itself, the interior dome lights would stay on, and worst of all, the van would intermittently refuse to crank. The battery was new, and the alternator checked out. After connecting my scan tool, I saw a flurry of U-codes (communication errors) pointing to the BCM. These modules are notorious for internal circuit board failures after years of heat cycles and vibrations. By installing a pre-programmed Savana 1500 Body Control Module, we resolved every single electrical gremlin in one go, saving the owner from a costly diagnostic goose chase and getting his business back on the road.
Common Signs of a Failing BCM
If your vehicle is showing these symptoms, a failing Body Control Module is the likely culprit. Don’t let these issues leave you stranded.
- ✔ Flickering or non-functional interior and exterior lights.
- ✔ Power windows, locks, or mirrors operating erratically or not at all.
- ✔ The security or anti-theft light flashing, preventing the engine from starting.
- ✔ Inaccurate or dead gauges on the instrument cluster.
- ✔ False warnings on the driver information center (e.g., “Service Airbag,” “Service StabiliTrak”).
- ✔ Communication error codes, such as U0140, U0155, or other U-series faults.
- ✔ Complete loss of communication with the BCM when checked with a diagnostic scanner.
Your Straightforward BCM Installation Roadmap
Installing your cloned BCM is a manageable job for a DIY enthusiast or any professional technician. Follow these general steps for a successful replacement.
- 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 and Express vans, the BCM is located in the center dash area. You may need to remove a few dash panels for access. Refer to a service manual for the exact location on your specific model.
- Disconnect and Remove: Carefully unplug all electrical connectors from the old BCM. They have locking tabs that need to be depressed. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Mount the new, pre-programmed BCM in the same location and securely reconnect all electrical connectors. You should hear a ‘click’ as they lock into place.
- Reconnect Power: Re-attach the negative battery terminal.
- Perform Final Checks: Turn the ignition to the ‘On’ position and verify that your lights, locks, windows, and other body functions are working correctly. Start the vehicle. Note the important post-installation procedures below.
Important Post-Installation Notes
Our cloning service handles the heavy lifting, but some vehicle systems may require a final handshake to recognize the new module. 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 recalibration might be necessary to ensure correct brake light operation and to prevent issues with the traction control system.
Disclaimer: Vehicle systems vary. Always consult a factory service manual or a qualified technician if you are unsure about any step.
Verified Fitment Across the GM Lineup
This BCM is a direct replacement for part number 20935349 and interchanges with a wide range of other part numbers. It is compatible with numerous GM vehicles. Please verify your part number or contact us with your VIN to confirm compatibility.
Frequently Asked Questions
Frequently Asked Questions
What is a “Cloning Service”?
Cloning is a specialized process where we transfer the exact software, VIN, and security data from your original BCM to the replacement unit. This makes the installation much simpler and avoids the need for additional programming at a dealership.
Do I need to send my old BCM to you?
No, you do not need to send us your part. We perform the programming using the VIN you provide during checkout. After installation, your old module is returned to you along with the newly programmed one. We do not require a core.
Is this part difficult to install myself?
For someone with basic mechanical skills, the physical replacement is straightforward. The main challenge with BCMs is typically the programming, which our cloning service handles for you. Please review our installation guide and be aware of potential post-install relearn procedures.
Will this fix my vehicle’s no-start problem?
A failing BCM is a very common cause of no-start or intermittent-start conditions, especially if the security light is flashing. While this part often resolves the issue, it’s always best to perform a full diagnosis to rule out other causes like a bad starter or ignition switch.
What happens if the airbag light comes on after I install it?
This is a known possibility. The airbag system (SDM) may need to be electronically introduced to the new BCM. This requires a professional-grade scan tool to perform the ‘Setup SDM Primary Key in BCM’ procedure, which is a quick task for any competent repair shop.
Which part number do I need to match?
This module, 20935349, replaces a long list of original part numbers, including 15819552, 25892622, 20815898, and many others. The best way to ensure compatibility is to match one of the numbers from the list on this page to the one on your original module or to provide us with your VIN.