Restore Your Truck’s Electrical Functions and Peace of Mind
Is your 2002 Chevy Avalanche or GM truck acting like it’s haunted? Flickering lights, power windows with a mind of their own, or a security light that won’t turn off are more than just annoyances—they’re classic signs of a failing Body Control Module (BCM). As the central command for your vehicle’s body electronics, a faulty BCM can cause a cascade of frustrating and unpredictable problems. I’ve seen it hundreds of times in my shop: a customer comes in thinking they have a dozen different issues, when the real culprit is this single module.
This isn’t just a replacement part; it’s a direct solution. We take the guesswork and high dealership costs out of the equation. Simply provide your vehicle’s VIN during checkout, and we will program this BCM with the latest GM software updates specific to your truck. It arrives at your door ready for a straightforward installation, getting you back on the road without the need for expensive scan tools or a trip to the dealer for programming. This is the reliable fix you’ve been looking for.
A Technician’s Notebook
I remember a 2002 Sierra 2500 that came into the bay with a laundry list of complaints from the owner. The radio would turn on and off, the power locks worked intermittently, and the dreaded ‘SECURITY’ light was permanently on, sometimes preventing the truck from starting. The owner had already replaced the battery and checked fuses, getting nowhere. After a quick scan, I saw communication loss codes pointing to the BCM. Instead of a complex rewiring job, the fix was a new, properly programmed BCM. Once we swapped it out, it was like the truck took a deep breath—all the gremlins vanished. This is why a correctly programmed 2002 Avalanche BCM is so critical; it restores order to the entire system.
Is Your GM Truck Showing These Symptoms?
- ✔ Power windows, mirrors, or door locks operating erratically or not at all.
- ✔ The ‘SECURITY’ or anti-theft light is illuminated on the dashboard.
- ✔ Interior dome lights or dashboard lights flicker or fail to work correctly.
- ✔ The horn sounds randomly or doesn’t work when pressed.
- ✔ Intermittent no-start conditions, especially with the security light on.
- ✔ Communication error codes stored, such as U-series codes (e.g., U0140).
- ✔ Inconsistent A/C compressor clutch engagement.
Your Straightforward Installation Guide
Installing your new BCM is designed to be a simple process. For most of the trucks this fits, like the 2002 Avalanche, the BCM is located under the driver’s side of the dashboard, near the steering column.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the BCM: On most models this fits, you’ll find it under the driver-side dash. You may need to remove a lower dash panel for access.
- Disconnect Connectors: Carefully unplug the wiring harness connectors from the old BCM. They have release tabs that need to be pressed. Do not force them.
- Remove the Old Module: Unbolt or unclip the old BCM from its mounting bracket.
- Install the New BCM: Mount your new, pre-programmed BCM in the same location and securely plug in all the wiring connectors.
- Reconnect Battery: Reattach the negative battery terminal. The vehicle is now ready to start.
Important Post-Installation Steps
Because this 2002 Avalanche BCM is pre-programmed, most functions will work immediately. However, depending on your vehicle’s specific configuration, a couple of simple relearn procedures may be needed. There is no core charge, so you can keep your old part.
- Airbag System Sync: If your airbag warning light is on after installation, a professional scan tool is required to perform the ‘Setup SDM Primary Key in BCM’ procedure. This syncs the new BCM with the airbag system.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration might be necessary to ensure correct brake light and traction control operation.
Disclaimer: Vehicle systems can vary. We always recommend consulting a factory service manual or a qualified technician if you are unsure about any step.
Will This Fit My Vehicle?
This BCM is a direct-fit replacement for a wide range of GM vehicles and is compatible with part numbers 15063578, 15081796, 15095334, 19208537, DKAK, and DPNU. Please verify your part number or contact us with your VIN. It is guaranteed to fit the following models:
- ✔ 2002 Avalanche 1500 (4×2)
- ✔ 2002-2005 Astro / Safari
- ✔ 2002-2005 Blazer S10 / Jimmy S15
- ✔ 2002-2004 S10 / S15 / Sonoma
- ✔ 2002 Escalade (4×2)
- ✔ 2002 Silverado & Sierra 1500, 2500, 3500
- ✔ 2002 Sierra Denali
- ✔ 2002 Suburban 1500 (4×2) & 2500
- ✔ 2002 Tahoe (4×2)
- ✔ 2002 Yukon & Yukon XL 1500 (4×2), Yukon XL 2500
Frequently Asked Questions About The 2002 Avalanche BCM
Frequently Asked Questions
Do I need to get this BCM programmed by a dealer?
No. This Body Control Module comes fully programmed to your vehicle’s VIN before we ship it. It’s designed to be a plug-and-play solution, saving you time and money.
What is a BCM and what does it do?
The BCM, or Body Control Module, is a computer that manages many of your vehicle’s non-engine related functions. This includes power windows, locks, interior lighting, the security system, and the horn.
Is this a difficult part to install myself?
For someone with basic mechanical skills, this is a very manageable job. The BCM is typically located under the driver’s side dashboard and is held in by a few bolts or clips and has several plug-in connectors. No special tools are required for the physical swap.
Will this fix the ‘SECURITY’ light on my dash?
Yes, a faulty BCM is one of the most common causes of an illuminated security light and related no-start issues on these GM trucks. Replacing it with this pre-programmed unit will resolve that problem.
What happens if the airbag light comes on after I install it?
In some cases, the new BCM needs to be electronically introduced to the airbag module (SDM). This is a simple procedure called ‘Setup SDM Primary Key in BCM’ that can be performed by any professional shop with a compatible bi-directional scan tool.
Is there a core charge for this part?
No, there is no core charge. You are not required to send your old BCM back to us.