Restore Full Electrical Function to Your GM Van or SUV
Are you battling frustrating and unpredictable electrical issues in your 2008-2012 GMC Savana 3500 Van? Problems like flickering lights, malfunctioning power windows and locks, a dead instrument cluster, or a security system that prevents your vehicle from starting are classic signs of a failing Body Control Module (BCM). The BCM is the central command center for your vehicle’s body electronics, and when it fails, it can make your reliable workhorse feel possessed. This replacement BCM, part number 20815898, is the definitive, hassle-free solution to restore order and get your vehicle operating as it should.
From the Diagnostic Bay: The Work Van That Wouldn’t Cooperate
I remember a fleet customer bringing in a 2011 Savana 3500. The complaint was ‘it’s just acting crazy.’ The dome lights would stay on, the radio would shut off randomly, and occasionally the turn signals wouldn’t work. They had already replaced the battery and checked all the fuses. After connecting my scan tool, I saw a slew of communication error codes (U-codes) pointing to a network problem. In my 20+ years of experience, these symptoms almost always lead back to the BCM. It acts as a gateway for multiple data networks, and when its internal processors or solder joints fail, it creates chaos. We installed a BCM with a cloning service like this one, and it immediately resolved all the issues. The driver was back on the road the same afternoon, saving the company a full day of lost revenue.
Is Your Savana Showing These BCM Failure Symptoms?
A faulty BCM can manifest in numerous ways. If you’re experiencing any of the following, a failing BCM is the likely culprit:
- ✔ Erratic or non-functional interior and exterior lights.
- ✔ Power windows, door locks, or mirrors working intermittently or not at all.
- ✔ The security or anti-theft system engaging randomly, causing a no-start condition.
- ✔ Instrument panel gauges sweeping erratically or going completely dead.
- ✔ Communication error codes stored, such as U0100, U0140, or other ‘U’ codes.
- ✔ Unexplained battery drain that leaves you stranded.
Our Simple, No-Hassle Cloning Service
Forget expensive trips to the dealership for programming. Our cloning service makes this repair straightforward. Here’s how it works: After you place your order, you will send us your original BCM. We will then transfer all the critical vehicle-specific data—including VIN, mileage, and key information—directly to this replacement unit. This ensures seamless communication with your vehicle’s other modules. We then ship both your original module and the ready-to-install replacement back to you. This process eliminates the need for expensive factory scan tools and complex post-installation programming, making it a perfect solution for both professional mechanics and DIYers.
Your Step-by-Step BCM Installation Guide
Installing your new 2008-2012 Savana 3500 BCM is a manageable job for anyone with basic tools. For Savana and Express vans, the BCM is typically located in the center dash area.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Access the Module: You will likely need to remove a few dash panels to access the BCM. It’s often mounted to a bracket near the center of the dashboard structure.
- Disconnect and Remove: Carefully unplug the electrical connectors. Most have a locking tab that needs to be depressed or lifted. Once disconnected, unbolt the old BCM from its mounting bracket.
- Install the New BCM: Mount the new, cloned BCM onto the bracket and securely plug in all the electrical connectors. You should hear a ‘click’ as they lock into place.
- Reassemble and Reconnect: Reinstall any dash panels you removed. Reconnect the negative battery terminal.
- Final Checks: Start the vehicle and test all body functions: lights, wipers, power locks, windows, radio, and instrument cluster to confirm the repair was successful.
Important Post-Installation Notes
In some cases, additional steps may be needed:
- Airbag System Sync: If the airbag warning light is on after installation, a ‘Setup SDM Primary Key in BCM’ procedure is required using a professional-grade scan tool.
- Brake Pedal Position Relearn: A relearn procedure might be necessary to ensure correct brake light and traction control operation.
Disclaimer: Always consult a factory service manual for your specific vehicle for detailed instructions and torque specs.
Confirmed Vehicle Compatibility List
This BCM is a direct replacement for part number 20815898 and is interchangeable with a wide range of other part numbers. It fits numerous GM vehicles. Please verify your part number or match your vehicle from the list below.
Interchangeable Part Numbers: 10382479, 15093910, 15276271, 15299986, 15819552, 15828601, 15837419, 15872388, 15872421, 15880684, 15921352, 15921353, 15948438, 15948439, 20815898, 20839063, 20864767, 20864768, 20921435, 20921436, 20935349, 22860591, 25826124, 25826125, 25847588, 25847589, 25892622, 25910474, 25934762, 25934763, 95151084
Fits Models Including: ACADIA 07-12, AVALANCHE 1500 10, CAPRICE 11-13, CAPTIVA SPORT 12, CTS 08-13, DTS 06-11, ENCLAVE 08-12, EQUINOX 07-09, ESCALADE 10, EXPRESS 1500/2500/3500 VAN 08-12, G8 08-09, HUMMER H2 08-09, IMPALA 06-13, LUCERNE 06-11, MONTE CARLO 06-07, OUTLOOK 07-10, SAVANA 1500/2500/3500 VAN 08-12, SRX 07-09, STS 10, SUBURBAN 1500 10, TAHOE 10, TORRENT 07-09, TRAVERSE 09-12, VUE 08-10, YUKON 10, YUKON XL 1500 10.
(Please check the detailed fitment list in the original description or contact us to confirm.)
How does the cloning service work?
How does the cloning service work?
After your purchase, you’ll receive instructions to mail your original BCM to us. We use specialized equipment to read the vehicle-specific data from your module and write it directly onto the replacement unit. This makes the new part plug-and-play, with no further programming needed.
Do I need to provide my VIN?
No, you do not need to provide your VIN separately. All necessary information, including the VIN, is extracted directly from your original module during the cloning process.
Will I get my original module back?
Yes. We always return your original (core) module along with the fully programmed replacement unit. We do not keep your old part.
Is this a difficult part to install myself?
For someone with basic mechanical skills, it’s a very manageable job. The main challenge is typically accessing the BCM behind the dashboard. Our cloning service removes the most difficult part of the job: the computer programming.
What if my airbag light comes on after installation?
This is uncommon, but if it happens, it means the BCM and the airbag module (SDM) need to be synced. This requires a ‘Setup SDM Primary Key in BCM’ procedure, which can be performed by a repair shop with a professional-grade diagnostic tool.