Is Your GM Truck Plagued by Electrical Gremlins?
If you’re dealing with flickering lights, malfunctioning power windows or locks, or a security system that has a mind of its own, the culprit is often a failing Body Control Module (BCM). The BCM is the central nervous system for your truck’s body electronics, coordinating everything from the interior lights and power accessories to the anti-theft system. When it starts to fail, it can cause a cascade of frustrating and unpredictable issues that can make your vehicle feel unreliable.
The Direct Solution for Your 1999-2000 Sierra BCM
This is a direct replacement Body Control Module, part number 16257125, for a wide range of GM trucks and SUVs, including the 1999-2000 GMC Sierra and Chevrolet Silverado. We take the guesswork and hassle out of the replacement process. Unlike a generic part from a salvage yard, this module is professionally programmed specifically for your vehicle using your VIN. This ensures that all the factory-intended functions and options your truck was built with will work correctly right out of the box. We load the latest software updates from GM, which can resolve common factory bugs and improve overall performance and stability.
From the Diagnostic Bay
We had a 2000 Silverado 1500 come in with a classic complaint: the power door locks would work intermittently, and the dome light would sometimes stay on, draining the battery. The owner had already replaced both door lock actuators and the dome light switch, spending hundreds on parts and hours of his weekend with no success. After a quick scan, we saw communication fault codes pointing to the BCM. A failing BCM was sending erratic signals, making other good parts seem faulty. We installed a VIN-programmed BCM, and instantly, all the issues were resolved. It’s a powerful reminder that diagnosing the root cause saves time, money, and a lot of frustration.
Common Symptoms of a Failing BCM
- ✔ Intermittent or non-functional power windows, door locks, or mirrors.
- ✔ Interior or exterior lights staying on or not turning on at all.
- ✔ The security system engaging randomly or preventing the vehicle from starting (PassLock issues).
- ✔ Erratic behavior from the radio or instrument cluster gauges.
- ✔ False warning lights appearing on the dashboard.
- ✔ Horn honking unexpectedly.
- ✔ A “Service Vehicle Soon” message that won’t go away.
Simple Process, Lasting Repair
Our goal is to make this repair as straightforward as possible. Here’s how it works:
- Place Your Order: Purchase the BCM for your vehicle.
- Provide Your VIN: After your purchase, reply to your order confirmation email with your vehicle’s 17-digit VIN.
- We Program & Ship: Our technicians will program the module with the latest GM software matched to your VIN. The BCM is then securely packaged and shipped directly to you.
This module is a plug-and-play solution for most vehicles it fits. Installation is typically straightforward, involving locating the old module (usually under the driver’s side dashboard), disconnecting the electrical connectors, and swapping in the new one. However, please be aware of potential post-installation procedures.
Post-Installation Requirements
While we handle the primary programming, some vehicle systems may require a synchronization or relearn procedure after the new BCM is installed. These are standard procedures that a qualified mechanic or a DIYer with a high-end scan tool can perform.
- Airbag System Sync: If the airbag warning light is illuminated after installation, a ‘Setup SDM Primary Key in BCM’ procedure is needed to sync the new BCM with the airbag system’s Sensing and Diagnostic Module (SDM).
- Brake Pedal Position Relearn: On some models, a recalibration of the brake pedal position sensor may be necessary to ensure correct brake light operation.
There is no core charge for this part. You can keep your original module, eliminating the hassle and expense of shipping it back.
Frequently Asked Questions
What exactly does the Body Control Module do on my truck?
The BCM acts as a central computer for your vehicle’s body electronics. It controls non-engine related functions like power windows, locks, interior and exterior lighting, the security system, wipers, and the radio.
Is this BCM difficult to install?
For someone with basic mechanical skills, the physical installation is typically easy. It’s usually located under the driver’s side of the dashboard and involves swapping a few electrical connectors. The key is being aware that some post-installation electronic relearn procedures may be necessary.
How do I provide my VIN for programming?
After you complete your purchase, simply reply to the order confirmation email you receive with your vehicle’s 17-digit VIN. We cannot ship your part until we receive this information.
Do I need to send my old BCM back?
No. We do not require a core return for this module. You can keep your original part, saving you time and return shipping costs.
What if my airbag light is on after I install the new BCM?
This is a known possibility. It means the new BCM needs to be electronically introduced to the airbag module (SDM). A procedure called ‘Setup SDM Primary Key in BCM’ must be performed with a professional-grade scan tool to resolve this.