Restore Full Control and Erase Electrical Frustrations
If your 2010 Chevrolet Avalanche 1500 is starting to feel haunted by electrical gremlins—flickering dash lights, power windows with a mind of their own, or a security system that randomly prevents you from starting the engine—you’re not alone. These are classic signs of a failing Body Control Module (BCM). As the central nervous system for your truck’s comfort and convenience features, a faulty BCM can cause widespread, frustrating problems. This isn’t just an annoyance; it’s a reliability issue. We offer a dependable, straightforward solution: a replacement BCM, part number 20815898, that arrives at your door programmed specifically for your vehicle.
A Technician’s Notebook: The Avalanche That Wouldn’t Cooperate
I remember a 2010 Avalanche rolling into my bay last fall. The owner was at his wit’s end. The radio would turn off, the door locks would cycle while driving, and the “Service 4WD” light was on, even though the 4×4 system checked out mechanically. His previous mechanic had replaced the battery and checked all the grounds, but the problems persisted. After connecting my scan tool, I saw a slew of communication error codes (U-codes) pointing to a network issue. The culprit? The BCM was intermittently dropping off the data bus, creating chaos. Replacing the BCM with a correctly programmed unit didn’t just fix one problem—it fixed all of them at once, restoring the truck to perfect working order.
Is Your Avalanche Showing These Symptoms?
A failing BCM can manifest in numerous ways. If you’re experiencing any of the following, this module is the likely solution:
- ✔ Power windows, door locks, or mirrors operating erratically or not at all.
- ✔ Interior or exterior lights flickering, staying on, or not turning on.
- ✔ The security system or keyless entry failing to work correctly, sometimes causing a no-start condition.
- ✔ False warning lights on the instrument cluster (e.g., ABS, Airbag, Traction Control).
- ✔ Communication error codes stored, such as U0140 (Lost Communication With Body Control Module).
- ✔ Issues with the radio, climate control, or other interior accessories.
Plug-and-Play Installation: Get Back on the Road Fast
We make this repair as simple as possible. By providing us with your vehicle’s VIN during checkout, we can program this BCM with the latest GM software specific to your Avalanche’s options. This eliminates the need for an expensive trip to the dealership for programming. Your original module will be returned to you along with the replacement.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts.
- Locate the BCM: On the 2010 Avalanche, the BCM is typically located under the steering column, behind the lower dash panel.
- Remove Trim Panels: Carefully remove any plastic trim necessary to access the module.
- Disconnect and Remove: Unplug the electrical connectors from the old BCM. They have locking tabs that need to be depressed. Once disconnected, unbolt or unclip the module from its mounting bracket.
- Install the New BCM: Mount your new, pre-programmed BCM and securely reconnect all electrical connectors.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Final Checks: Start the vehicle and test all body functions—windows, locks, lights, radio, etc.—to confirm the repair. Note the post-installation procedures below.
Important Post-Installation Steps
While this module is programmed to be as close to plug-and-play as possible, some vehicle systems may require a relearn procedure to sync with the new BCM. This is a normal part of the process.
- 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 new BCM with the airbag system.
- Brake Pedal Position Relearn: In some cases, the brake pedal position sensor may need to be recalibrated to ensure proper brake light and traction control operation.
Disclaimer: Vehicle systems vary. We always recommend consulting a factory service manual or a certified technician if you are unsure about any step of the process.
Guaranteed Fitment for Your GM Vehicle
This BCM is a direct replacement for part number 20815898 and is compatible with a wide array of GM vehicles and part numbers. Please verify your part number or contact us with your VIN to ensure compatibility. This module fits:
AVALANCHE 1500 10 Body Control (BCM); (under steering column), ID 20815898
TAHOE 10 Body Control (BCM); (under steering column), ID 20815898 or 25892622
SUBURBAN 1500 10 Body Control (BCM); (under steering column), ID 20815898 or 25892622
YUKON 10 Body Control (BCM); (under steering column), ID 20815898 or 25892622
YUKON XL 1500 10 Body Control (BCM); (under steering column), ID 20815898 or 25892622
ESCALADE, ESV, EXT 10 Body Control (BCM); (under steering column), ID 20815898 or 25892622
…and many other GM models including Acadia, Enclave, Traverse, Express, Savana, Impala, CTS, DTS, and more. Please see the full fitment list and cross-reference numbers provided.
Do I need to send my original BCM to you?
Do I need to send my original BCM to you?
No, this service does not require you to send in your old part. We program the replacement module using the VIN you provide at checkout. We handle all the programming on our end before shipping it to you. Your original module is always returned to you with the replacement.
Is this a simple plug-and-play installation?
Yes, for the vast majority of functions. Because we program it to your VIN, it will control the main features like lights, windows, and locks upon installation. However, as noted, certain integrated systems like the airbags may require a final sync procedure with a professional scan tool if a warning light appears.
What does the Cloning Service mean?
Our service involves programming the replacement module with your vehicle’s specific factory software and configurations based on your VIN. This makes the new module an electronic ‘clone’ of the original’s intended programming, ensuring it works correctly with the options your truck was built with.
Will this fix my ‘Service Security System’ message?
A faulty BCM is a very common cause of security system errors and no-start conditions in these GM trucks. While other issues can cause this message, if you’re also experiencing other electrical symptoms, replacing the BCM is a highly effective repair.
What happens if I don’t provide my VIN?
Providing your VIN is essential for this service. We cannot program and ship the module without it, as the programming is unique to each vehicle. Failure to provide a VIN will result in a delay or cancellation of your order.