Restore Your Truck’s Electrical Functions
If you’re dealing with bizarre electrical issues in your 1999-2000 Silverado 2500—like power windows with a mind of their own, flickering interior lights, or a security system that randomly prevents your truck from starting—you’re not alone. These frustrating problems often point directly to a failing Body Control Module (BCM). The BCM is the central hub for your truck’s comfort and convenience features. When it fails, it can cause a cascade of confusing symptoms. This isn’t just an annoyance; it can affect your truck’s security and daily usability. We offer a reliable, straightforward solution: a replacement BCM, programmed specifically for your truck’s VIN.
I remember a 2000 Sierra 2500 that came into my shop with the classic BCM failure story. The owner was at his wit’s end. His power locks worked intermittently, the radio would shut off randomly, and the ‘Security’ light was always on, sometimes preventing the engine from cranking. He had already replaced the battery and checked all the fuses. Using a professional scan tool, we found a series of U-codes (U1000, U1016) indicating a loss of communication between modules. This confirmed our suspicion: the BCM was the culprit. Replacing it with a pre-programmed unit like this one solved every single issue in one go, saving the customer hundreds compared to a dealership visit.
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 likely the solution you need. Over my 20 years in the bay, these are the most common signs I’ve seen:
- ✔ Erratic power windows or door locks that don’t respond correctly.
- ✔ Interior dome lights that won’t turn off or come on unexpectedly.
- ✔ The security or anti-theft light is illuminated on the dash, possibly causing a no-start condition.
- ✔ Horn honking randomly or not working at all.
- ✔ Inconsistent operation of the radio or climate controls.
- ✔ Diagnostic Trouble Codes (DTCs) related to body systems or communication errors (e.g., B-series or U-series codes).
A Straightforward Guide to Installation
Installing your new BCM is a manageable job for a DIYer with basic tools. This module is located on the driver’s side of the dashboard. Here’s a general guide to get you started:
- Safety First: Always disconnect the negative terminal from your truck’s battery to prevent any electrical shorts.
- Access the Module: You’ll likely need to remove the lower dash panel beneath the steering column to get to the BCM. It’s typically mounted to a bracket.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be depressed. Once disconnected, unbolt the old BCM from its mounting bracket.
- Install the New BCM: Mount your new, pre-programmed BCM onto the bracket and securely plug in all the electrical connectors. You should hear a ‘click’ as they lock into place.
- Reassemble and Test: Reinstall the dash panel, reconnect your battery, and start the truck. Test all the functions like windows, locks, lights, and radio to confirm the repair.
Important Post-Installation Information
Because this 1999-2000 Silverado 2500 BCM is pre-programmed, most of the hard work is done. However, depending on your vehicle’s specific systems, a couple of additional steps, known as relearn procedures, might be necessary. These procedures sync the new module with other systems in your truck.
Airbag System Sync: In some cases, the airbag warning light may illuminate after installation. This means the new BCM needs to be synced with the SDM (Sensing and Diagnostic Module). A professional-grade scan tool is required to perform the ‘Setup SDM Primary Key in BCM’ procedure to clear the light.
Brake Pedal Position Relearn: You may also need to perform a brake pedal position sensor recalibration. This ensures your brake lights and traction control system function as intended. This procedure can also be completed with a compatible diagnostic tool.
Will This Fit My Truck or SUV?
This BCM is a direct-fit replacement for a wide range of GM vehicles and is compatible with multiple part numbers, including 16257125, 19153625, and 8093668010. Please verify your vehicle is on the list below for guaranteed compatibility:
- 1999-2000 Silverado 1500/2500 Pickup (LH dash)
- 1999-2000 Sierra 1500/2500 Pickup (LH dash)
- 1998-2000 S10/S15/Sonoma (center dash)
- 1998-2000 Blazer S10/Jimmy S15 (center dash)
- 2000 Astro / Safari (GMC) (LH dash)
- 1999-2000 Isuzu Hombre (LH dash)
- 1998 Bravada (center dash, w/ extended build date opt ZN4)
Frequently Asked Questions
Do I need to send my old BCM back?
No. We do not require you to return your original module. There is no core charge associated with this purchase, which saves you time and return shipping costs.
What does ‘pre-programmed to my VIN’ mean?
It means we flash the module with your truck’s specific Vehicle Identification Number (VIN) and the latest GM software before we ship it. This ensures it communicates correctly with your truck’s other systems, making installation much simpler than using a blank module from a dealer.
Is this a difficult part to replace myself?
For someone with basic mechanical skills, this is a very manageable repair. The BCM is typically located under the driver’s side dashboard and can be swapped with common hand tools. The main benefit of our part is that the complex computer programming is already done for you.
What happens if my airbag light comes on after I install it?
This is a possibility and requires a ‘relearn’ procedure to sync the new BCM with your vehicle’s airbag system (SDM). This procedure, called ‘Setup SDM Primary Key in BCM’, must be done with a professional-grade diagnostic tool. A local repair shop can perform this service for you.
Will this 1999-2000 Silverado 2500 BCM fix my no-start problem?
It absolutely can. One of the BCM’s key roles is managing the Passlock anti-theft system. When the BCM fails, it can mistakenly think the truck is being stolen and prevent it from starting. If your ‘Security’ light is on, a faulty BCM is a very common cause.