If you’re wrestling with baffling electrical problems in your 1999-2000 GM truck, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen firsthand how a failing Body Control Module (BCM) can turn a reliable workhorse into a source of constant frustration. Flickering interior lights, power windows and locks with a mind of their own, a security light that won’t turn off, or even a no-start condition—these are all classic signs that your BCM, the nerve center of your truck’s body electronics, is on its last legs.
Don’t waste another weekend chasing wires or pay steep dealership prices for diagnostics and programming. We offer a straightforward, reliable solution: a high-quality replacement BCM, part number 8093668010, that arrives at your door fully programmed to your truck’s specific Vehicle Identification Number (VIN). We flash it with the latest GM software updates, ensuring optimal performance and compatibility right out of the box. This eliminates the need for expensive scan tools or a trip to the dealer, getting you back on the road faster.
From the Diagnostic Bay: Chasing Electrical Gremlins
I remember a 2000 Sierra 1500 that came into my shop with a complaint that stumped two other mechanics. The owner said the dome light would randomly flicker, the radio would sometimes cut out, and occasionally, the truck just wouldn’t crank. There were no consistent trouble codes, just a general ‘U’ code for loss of communication that would come and go. After checking all the usual suspects—battery, grounds, ignition switch—we focused on the BCM. On these GMT800 platforms, the BCM is the central hub for so many circuits. Even a minor internal failure, often from years of heat cycles and voltage fluctuations, can create a cascade of bizarre, unrelated symptoms. Swapping in a pre-programmed BCM fixed every single issue instantly. It’s a perfect example of how replacing one component can solve a dozen problems.
Is Your Truck 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:
- ✔ Intermittent or non-functional power windows, door locks, or mirrors.
- ✔ Dome lights, dash lights, or headlights flickering or staying on.
- ✔ The security or anti-theft light is illuminated, preventing the engine from starting.
- ✔ Erratic behavior from the radio or climate controls.
- ✔ False door ajar warnings or alarm activations.
- ✔ Diagnostic trouble codes related to communication errors (e.g., U0140, U0100) or specific body circuits.
A Straightforward Guide to BCM Installation
Replacing the 1999-2000 Silverado BCM is a manageable job for a DIYer with basic tools. It’s typically located under the driver’s side of the dashboard.
- Safety First: Always disconnect the negative terminal from your truck’s battery before working on any electronic components.
- Locate the BCM: On most of these trucks, you’ll find it mounted to a bracket to the left of the steering column, under the dash. You may need to remove the lower dash panel for access.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be depressed. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed BCM in the same location and securely reconnect all electrical connectors. Ensure they click into place.
- Reconnect Battery & Test: Reconnect the negative battery terminal. Turn the key to the ‘On’ position and test all functions: lights, windows, locks, radio, etc.
Important Post-Installation Note: In some cases, additional steps may be required. If your airbag light is on, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure. A Brake Pedal Position Relearn might also be necessary. Always consult a service manual for vehicle-specific details.
Verified Vehicle Compatibility
This module is a direct replacement for part number 16257125 and other interchangeable numbers. It is guaranteed to fit the following vehicles:
- 1999-2000 Chevrolet Silverado 1500 / 2500
- 1999-2000 GMC Sierra 1500 / 2500
- 1998-2000 Chevrolet S10 / Blazer
- 1998-2000 GMC S15 Sonoma / Jimmy S15
- 2000 Chevrolet Astro / GMC Safari
- 1998 Oldsmobile Bravada (w/ opt ZN4)
- 1999-2000 Isuzu Hombre
Frequently Asked Questions
Do I need to send my old BCM back?
No. There is no core charge for this part. You can keep your original module.
Is this part truly plug-and-play?
Yes, for most vehicles. We program the BCM to your VIN before shipping, so it communicates with your truck’s existing components. In some rare cases, a post-install procedure like an airbag sync may be needed if a warning light appears.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit VIN. We cannot program and ship your module without it.
What tools are needed for the airbag or brake relearn procedures?
These procedures require a professional-grade bidirectional scan tool, such as a Tech 2, Snap-on, or Autel scanner. Most basic code readers cannot perform these functions.
Will this fix my truck’s no-start problem?
If your no-start is caused by the factory anti-theft system (Passlock) being triggered by a faulty BCM, then yes, this module is the correct fix. Our programming ensures it works with your existing security components.