Is Your 2010 Avalanche Acting Possessed?
If you’re dealing with a frustrating mix of electrical gremlins in your 2010 Chevy Avalanche—like power windows with a mind of their own, dashboard lights flickering randomly, or a security system that prevents your truck from starting—you’re not alone. After 20 years of turning wrenches, I can tell you these aren’t random quirks; they’re classic signs of a failing Body Control Module (BCM). The BCM is the central nervous system for your truck’s comfort and convenience features, and when it starts to go, it can cause chaos.
A Technician’s Notebook: The Phantom No-Start
I remember a 2010 Tahoe—which shares its platform with your Avalanche—that was towed into my bay. The owner was fed up. Sometimes it started, sometimes it didn’t. The security light was on, and the radio would occasionally cut out. He’d already replaced the battery and checked the alternator. My initial scan showed a slew of communication errors (U-codes) between various modules. This is a huge red flag. Instead of chasing individual components, I went straight for the network hub: the BCM. A failing BCM can’t properly direct traffic on the vehicle’s data bus, leading to these exact phantom issues. We swapped in a VIN-programmed BCM, and just like that, every problem vanished. It’s a fix I’ve performed hundreds of times on these GM trucks.
Signs Your BCM is the Culprit
A faulty BCM can manifest in numerous ways. Before you start replacing individual switches and motors, check if your truck is exhibiting any of these classic symptoms. A single one might be a fluke, but a combination strongly points to a failing 2010 Avalanche 1500 BCM.
- ✔ Intermittent or non-functional power windows, door locks, or mirrors.
- ✔ Erratic instrument cluster behavior, such as gauges dropping to zero or warning lights flashing.
- ✔ The security or anti-theft light stays on, often causing a no-start condition.
- ✔ Headlights, taillights, or interior lights not working correctly.
- ✔ Diagnostic trouble codes related to communication loss, such as U0140, U0155, or other U-codes.
- ✔ Key fob not responding or remote start failure.
The Simple, Reliable Solution
Forget expensive dealership visits and the hassle of finding a shop that can program a new module. We take the guesswork and complexity out of the equation. This Body Control Module, part number 20864768, arrives at your door pre-programmed with the latest GM software, specifically matched to your truck’s VIN. This ensures all factory-installed options work perfectly from the moment you plug it in. There’s no core charge, so you can keep your old part without any extra fees or return hassles.
Your Straightforward BCM Installation Guide
For the 2010 Avalanche, the BCM is located under the driver’s side of the dashboard, near the steering column. While professional installation is always an option, a confident DIYer can handle this job in under an hour.
- Safety First: Always disconnect the negative terminal from your truck’s battery and wait a few minutes before starting any electrical work.
- Locate the BCM: Remove the lower dash panel beneath the steering wheel to gain access. The BCM is a black plastic box with several large multi-pin connectors.
- Disconnect and Remove: Carefully unclip and disconnect all electrical connectors from the old BCM. Note their orientation. Then, unbolt or unclip the module from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed BCM in the same location. Securely reconnect all electrical connectors, ensuring they click into place.
- Reconnect and Test: Reattach the negative battery terminal. Turn the key to the ‘On’ position and test all functions: windows, locks, lights, gauges, and radio. Start the engine to ensure the security system has reset.
Important Post-Installation Notes
While our VIN programming handles the vast majority of functions, some vehicle safety systems may require a final handshake after installation. If you encounter an airbag warning light, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure. Similarly, some models may require a ‘Brake Pedal Position Relearn’ to ensure perfect brake light and traction control operation. These are standard GM procedures, and any qualified technician can perform them if necessary.
Verified Fitment for Your GM Vehicle
This BCM is a direct replacement for a wide range of GM vehicles. Please match your original part number to the list below or confirm fitment with your vehicle’s specific model and year. This unit is a confirmed fit for a 2010 Avalanche 1500 BCM and replaces 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 and fits models including the Acadia, CTS, Escalade, Express/Savana vans, Impala, Suburban, Tahoe, Yukon, and more.
Frequently Asked Questions
Do I need to get this BCM programmed by a dealer?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during checkout, and it will arrive ready to install with the latest GM software.
Where is the BCM located on my 2010 Chevy Avalanche?
The Body Control Module is typically located under the driver’s side dashboard, to the left of the steering column. You will need to remove the lower dash panel to access it.
What if my airbag light is on after installation?
This can happen occasionally. It means the new BCM needs to be synced with the airbag system’s Sensing and Diagnostic Module (SDM). A procedure called ‘Setup SDM Primary Key in BCM’ must be performed with a professional-grade scan tool to clear the light.
Is there a core charge for this part?
No, there is absolutely no core charge. You are not required to send your old BCM back to us.
How do I provide my VIN for programming?
After you complete your purchase, you will receive instructions on how to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship your order until we receive and validate your VIN.