Tired of Chasing Electrical Gremlins in Your GM Truck or Van?
If you’re dealing with flickering dash lights, power windows with a mind of their own, or a security light that prevents your vehicle from starting, you’re not alone. The Body Control Module, or BCM, is the central hub for your vehicle’s body electronics. When it fails, it can cause a cascade of frustrating and seemingly unrelated issues. This isn’t just an annoyance; it can impact vehicle security and safety. We offer a reliable, cost-effective solution: a professionally programmed 2002-2005 GM BCM that’s ready for installation right out of the box.
From the Diagnostic Bay
I remember a 2002 Silverado 2500 that came into my shop. The owner was convinced he needed a new alternator and battery. His interior lights would pulse, the radio would cut out, and the door locks would cycle randomly while driving. He’d already spent money on parts that didn’t fix the issue. After a quick scan, I saw multiple communication codes (U-codes) pointing to the BCM. The root cause wasn’t the charging system; it was the BCM’s internal logic board failing due to years of heat cycles and vibration. We swapped in a VIN-programmed BCM, and every single issue vanished. It’s a classic failure I’ve seen hundreds of times on these otherwise reliable trucks.
Is Your GM Truck or Van Showing These Signs?
A failing BCM can manifest in many ways. If you’re experiencing any of the following, this module is likely the culprit:
- ✔ Intermittent or non-working power windows, door locks, or mirrors.
- ✔ Gauges on the instrument cluster behaving erratically or not working at all.
- ✔ The security or anti-theft light stays on, often causing a no-start condition.
- ✔ Interior dome lights or exterior lamps staying on or not turning on.
- ✔ The horn sounding unexpectedly or not working when pressed.
- ✔ Diagnostic trouble codes (DTCs) related to lost communication, such as U0140, U0155, or other U-codes.
The Smart Solution: VIN-Programmed for Your Vehicle
The biggest hurdle in replacing a BCM has always been the expensive programming required at a dealership. We eliminate that step entirely. When you order, you provide us with your vehicle’s 17-digit VIN. Our technicians then flash this 2002-2005 GM BCM with the latest, most stable software directly from GM, ensuring it’s a perfect match for your vehicle’s specific options and configuration. This means no extra tools, no trips to the dealer, and no surprise programming fees. Plus, there is no core charge, so you can keep your old part.
Your Straightforward BCM Installation Guide
Replacing the BCM is a job most DIYers can handle with basic tools. The location varies slightly by model, but the process is similar.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the BCM: On models like the Astro and Blazer, it’s typically behind the center dash/glove box area. On trucks like the Silverado and Sierra, it’s usually mounted under the driver’s side of the steering column.
- Remove Trim Panels: Carefully remove any plastic trim or kick panels necessary to access the module.
- Disconnect and Unbolt: Unplug the electrical connectors. They have locking tabs that need to be depressed. Then, unbolt the module from its mounting bracket.
- Install the New BCM: Bolt the new module into place and securely reconnect all electrical harnesses. You’ll hear a click as they lock in.
- Reconnect and Test: Re-attach the negative battery terminal. Turn the key to the ‘ON’ position and test your lights, locks, windows, and other functions to confirm the repair.
Important Post-Installation Information
In some cases, additional synchronization procedures may be needed after installation. This is normal and depends on your vehicle’s specific systems.
- Airbag System Sync: If your airbag warning light is on after the swap, a simple ‘Setup SDM Primary Key in BCM’ procedure is required. This syncs the new BCM with the airbag module and must be done with a bi-directional scan tool.
- Brake Pedal Position Relearn: Some models may require a brake pedal position sensor relearn to ensure proper brake light operation and traction control functionality.
Disclaimer: Vehicle systems vary. We always recommend consulting a factory service manual or a certified technician if you are unsure about any step.
Verified Fitment for Your Vehicle
This BCM is a direct replacement for part numbers 15063578, 15081796, 15095334, 19208537, DKAK, and DPNU. It is guaranteed to fit the following models:
- 2002-2005 Chevrolet Astro / GMC Safari
- 2002-2005 Chevrolet S10 Blazer / GMC S15 Jimmy
- 2002-2004 Chevrolet S10 / GMC Sonoma
- 2002 Chevrolet Avalanche 1500 (4×2)
- 2002 Cadillac Escalade (4×2)
- 2002 Chevrolet Silverado & GMC Sierra 1500, 2500, 3500
- 2002 GMC Sierra Denali
- 2002 Chevrolet Suburban & GMC Yukon XL 1500 (4×2), 2500
- 2002 Chevrolet Tahoe & GMC Yukon (4×2)
Frequently Asked Questions
Do I need to program this BCM?
No! We handle all the programming for you before shipment. Just provide your VIN during checkout, and it will arrive ready to install.
How do I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your driver’s side door jamb sticker, on your insurance card, or on the dashboard plate visible through the driver’s side of the windshield.
Will this fix the ‘Security’ light on my dash?
In most cases, yes. A faulty BCM is a very common cause of a persistent security light and the associated no-start condition on these GM vehicles. This module is programmed to resolve that issue.
What if my airbag light turns on after I install it?
This is a known possibility. It simply means the new BCM needs to be electronically ‘introduced’ to the airbag module. This requires a ‘Setup SDM Primary Key’ procedure with a professional scan tool, which any competent repair shop can perform.
Is there a core charge for my old part?
No, there is absolutely no core charge. You are not required to send your original module back to us.
Where is the BCM located on my 2002 Silverado?
On most 2002 GM full-size trucks like the Silverado, Sierra, Tahoe, and Yukon, the BCM is located under the driver’s side dashboard, to the left of the steering column.