Are you chasing down frustrating electrical gremlins in your GM truck, van, or SUV? If you’re dealing with flickering lights, a security system that acts up, or power accessories that have a mind of their own, you’ve likely met the common culprit: a failing Body Control Module (BCM). As a technician with over two decades of experience, I’ve seen how a bad BCM can make a perfectly good vehicle feel unreliable. This isn’t just an inconvenience; it can affect vehicle security and safety. That’s why we offer this direct-replacement BCM, professionally programmed to your vehicle’s specific VIN, to restore full functionality and peace of mind.
This isn’t a generic, one-size-fits-all part. We take your vehicle’s VIN and flash this module with the latest GM software updates. This critical step ensures seamless communication between the BCM and your vehicle’s other systems, like the engine computer and anti-theft system. By handling the programming before we ship, we eliminate the need for an expensive trip to the dealership, saving you time and money. You get a part that’s truly ready for installation right out of the box, making it a perfect solution for both seasoned mechanics and determined DIYers.
From the Diagnostic Bay: The Silverado with a Mind of Its Own
I recall a 2000 Silverado 1500 that came into my shop with a laundry list of bizarre symptoms. The owner said the dome lights would stay on, the radio would randomly shut off, and sometimes the power door locks wouldn’t respond. He’d already replaced the battery and checked all the fuses. After connecting my scan tool, I noticed several communication error codes (U-codes) pointing to the BCM. A faulty BCM was creating a network storm, disrupting other modules. Installing a VIN-programmed 1999-2000 GM BCM was the solution. All the strange electrical issues vanished instantly, and the owner was thrilled to have his reliable truck back. These modules are the central hub for body electronics, and when they fail, the symptoms can be incredibly misleading.
Is Your GM Vehicle Showing These Symptoms?
- ✔ Intermittent or non-working power windows, door locks, or mirrors.
- ✔ Interior or exterior lights flickering, staying on, or not turning on at all.
- ✔ The security or anti-theft system light is on, or the vehicle won’t start.
- ✔ The horn honks unexpectedly or doesn’t work.
- ✔ Dashboard warning lights illuminating without a clear cause.
- ✔ Communication error codes stored, such as U0140 (Lost Communication With Body Control Module).
- ✔ Erratic behavior from the radio or climate control system.
Your Straightforward BCM Installation Guide
Installing your new 1999-2000 GM BCM is a manageable job for someone with basic automotive skills. The location varies slightly by model, but it’s typically found behind the dashboard on the driver’s or center side.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the BCM: On most Silverados, Sierras, Astros, and Safaris, it’s on the driver’s side (LH dash). On S10s, Blazers, and Jimmys, it’s often in the center dash area. Consult a vehicle-specific guide if you’re unsure.
- Remove Trim Panels: You may need to remove lower dash panels or the glove box to gain access. Keep track of all screws and clips.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old BCM. They have locking tabs that must be depressed. Once disconnected, unbolt or unclip the old module and remove it.
- Install the New BCM: Mount your new, pre-programmed BCM in the same location and reconnect all electrical connectors. Ensure they click securely into place.
- Post-Installation Checks: Reconnect the battery terminal. Turn the key to the ‘On’ position and test all body functions: lights, wipers, power locks, windows, radio, etc.
Important Notes After Installation
While this BCM is programmed for a plug-and-play experience, some vehicle systems may require a ‘handshake’ with the new module. Please be aware of the following possibilities:
- Airbag System Sync: If your airbag warning light is on after installation, a simple sync procedure called ‘Setup SDM Primary Key in BCM’ is needed. This requires a professional-grade scan tool to complete and will clear the light.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor relearn might be necessary for proper brake light and traction control operation. This is also performed with a capable scan tool.
Verified Vehicle Compatibility
This module is a direct replacement for part number 16257125 and other interchangeable numbers. Please match your part number or vehicle from the list below to ensure correct fitment.
- Chevrolet S10 / GMC Sonoma (1998-2000): Body Control (BCM); (center dash), ID 16257125
- Chevrolet Blazer S10 / GMC Jimmy S15 (1998-2000): Body Control (BCM); (center dash), ID 16257125
- Oldsmobile Bravada (1998): Body Control (BCM); (center dash), w/extended build date (opt ZN4)
- Chevrolet Silverado 1500 / 2500 (1999-2000): Body Control (BCM); (LH dash)
- GMC Sierra 1500 / 2500 (1999-2000): Body Control (BCM); (LH dash)
- Chevrolet Astro / GMC Safari (2000): Body Control (BCM); (LH dash)
- Isuzu Hombre (1999-2000): Body Control (BCM); (LH dash)
This module also replaces part numbers: 19153625, 8191536250, 191583625, 8093668010, 8162571250, 09366801.
Frequently Asked Questions
What exactly does a Body Control Module do?
The BCM is the central computer for your vehicle’s ‘body’ electronics. It controls non-engine related functions like power windows, locks, interior/exterior lights, the security system, wipers, and the radio. When it fails, you get strange electrical problems.
Why do you need my VIN number?
Your Vehicle Identification Number (VIN) allows us to program the BCM with the specific software and settings for your truck’s exact configuration, including options like keyless entry and security system type. This ensures it works correctly right out of the box.
Is this part difficult to install for a DIYer?
For most DIYers with basic tools, this is a very manageable repair. The main challenge is accessing the module, which is usually under the dashboard. Since we handle the programming, the electrical part is just unplugging the old one and plugging in the new one.
Do I need 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 the part number before you order.
What if the airbag light comes on after I install it?
This can happen occasionally. It means the new BCM needs to be electronically introduced to the airbag system’s computer (SDM). A repair shop with a professional scan tool can perform the ‘Setup SDM Primary Key in BCM’ procedure in a few minutes to resolve this.