Restore Control and Eliminate Electrical Gremlins
Are you battling bizarre electrical issues in your GM truck or van? Flickering lights, malfunctioning power windows and locks, a security light that won’t turn off, or an instrument cluster that has a mind of its own are all classic signs of a failing Body Control Module (BCM). As the central nervous system for your vehicle’s body electronics, a faulty BCM can cause a cascade of frustrating and hard-to-diagnose problems. For over 20 years, I’ve seen these modules cause headaches for both seasoned mechanics and DIY enthusiasts. The constant communication errors can make you feel like you’re chasing ghosts in the machine.
This isn’t just a replacement part; it’s a direct solution. We provide a fully tested Body Control Module, a genuine GM BCM 15063578, that arrives at your door pre-programmed to your vehicle’s specific VIN. By flashing it with the latest GM software updates before shipping, we eliminate the need for an expensive trip to the dealership for programming. This saves you time, money, and the hassle of towing a vehicle that may not even start. Get your Silverado, Sierra, Astro, or Blazer back to full functionality with a reliable, ready-to-install BCM.
Case Study: A Tricky Diagnosis
A customer brought in a 2002 GMC Sierra 2500 with a complaint that was driving him crazy: the radio would turn on and off by itself, and sometimes the power door locks would cycle while driving. He had already replaced the radio and checked the door lock switches. After hooking up my scan tool, I noticed several U-codes (communication codes) pointing to a network issue. Instead of just replacing parts, I monitored the data stream from the BCM. I saw intermittent data dropouts that perfectly matched the moments the customer described. A failing BCM was corrupting the data bus. Installing a new, properly programmed BCM fixed all the phantom issues instantly. It’s a reminder that the BCM is the traffic cop for all body-related functions.
Signs Your GM BCM is Failing
A faulty BCM can manifest in numerous ways. If your vehicle is experiencing any of the following, it might be time for a replacement. Watch for communication error codes like U0140, U0155, or U0164.
- ✔ Erratic or non-functional power windows, door locks, or mirrors.
- ✔ Interior or exterior lights that stay on, flicker, or don’t work at all.
- ✔ The security or anti-theft light stays illuminated, preventing the engine from starting.
- ✔ The horn honking unexpectedly or the alarm going off randomly.
- ✔ Instrument panel gauges behaving erratically or going dark.
- ✔ The air conditioning system not responding to commands.
Your Straightforward BCM Installation Guide
Replacing your GM BCM 15063578 is a manageable job for a confident DIYer. The location can vary, so confirm if yours is in the center dash (common in vans and S-series trucks) or under the steering column (common in full-size trucks and SUVs).
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait 10-15 minutes before beginning work.
- Locate the Old BCM: Remove any necessary trim panels to access the module. It’s typically a black plastic box with several large multi-pin electrical connectors.
- Swap the Modules: Carefully disconnect all electrical connectors from the old BCM. Unbolt it from its mounting bracket and set it aside. Mount your new, pre-programmed BCM in its place.
- Reconnect Everything: Firmly plug all electrical connectors into the new module. Ensure they click and are fully seated. Reconnect your vehicle’s negative battery terminal.
- Perform Post-Install Procedures: Start the vehicle. If an airbag light appears or brake functions seem off, you may need to perform the ‘Airbag System Sync’ or ‘Brake Pedal Position Relearn’ procedures using a professional-grade scan tool.
Note: While this is a direct-fit part, always refer to a factory service manual for your specific model for detailed instructions and torque specs.
Verified Fitment for Your GM Vehicle
This module is a direct replacement for part numbers 15063578, 15081796, 15095334, 19208537, DKAK, and DPNU. It is guaranteed to fit the following vehicles:
Blazer S10/Jimmy S15: 2002-2005 (Center Dash Location)
S10/S15/Sonoma: 2002-2004 (Center Dash Location)
Silverado/Sierra 1500, 2500, 3500, Denali: 2002 (Under Steering Column)
Tahoe/Yukon/Yukon XL (4×2 Models): 2002 (Under Steering Column)
Suburban 1500 (4×2) & 2500: 2002 (Under Steering Column)
Avalanche 1500 (4×2 Models): 2002 (Under Steering Column)
Escalade (4×2 Models): 2002 (Under Steering Column)
Why do I need to provide my VIN?
Your Vehicle Identification Number (VIN) allows us to program the BCM with the exact software and settings your specific vehicle requires. This ensures all your original features work correctly and makes the installation process much simpler, avoiding a costly trip to the dealer.
Is this a plug-and-play part?
For the most part, yes. Because we program it to your VIN, it eliminates the most difficult step. However, as with any module replacement, some vehicles may require a simple ‘relearn’ procedure for the airbag or brake pedal position sensor, which can be done with a bi-directional scan tool.
Do I have to send my old BCM back?
No. There is no core charge for this part. You can keep your original module, which can be helpful for double-checking part numbers or for your own records.
What happens if the airbag light comes on after installation?
This is not uncommon. It simply means the new BCM needs to be electronically ‘introduced’ to the airbag system’s computer (SDM). A mechanic with a professional scan tool can perform the ‘Setup SDM Primary Key in BCM’ procedure to sync the modules and turn off the light.
Where is the GM BCM 15063578 located on my truck?
On 2002 full-size trucks and SUVs like the Silverado, Sierra, and Tahoe, it’s typically mounted under the driver’s side dash, near the steering column. On 2002-2005 mid-size models like the Blazer, S10, and Astro van, it’s usually found behind the center of the dashboard.