Restore Full Functionality to Your GM Truck or SUV
Are you battling a storm of strange electrical problems in your late 90s GM truck or SUV? Intermittent power windows, flickering lights, a security system that won’t cooperate, or a persistent battery drain can all point to one central culprit: a failing Body Control Module (BCM). The BCM acts as the main computer for your vehicle’s body electronics, and when it starts to go, it can make your reliable truck feel haunted. This isn’t just a replacement part; it’s a complete, pre-programmed solution designed to restore your vehicle’s electrical systems to factory-perfect condition.
Solving Common Issues with Your 1999-2000 GM BCM
A faulty BCM can manifest in numerous frustrating ways. Instead of swapping individual switches or chasing wires for hours, addressing the core issue can save you time, money, and headaches. Our VIN-programmed BCM is the definitive fix for these problems, arriving at your door ready for installation with the latest software updates from General Motors. This direct-fit module eliminates the need for an expensive trip to the dealership for programming, putting you back in control.
From the Diagnostic Bay
We had a ’99 Silverado in the shop where the owner was chasing a parasitic battery drain for months. He’d replaced the battery and alternator twice, but the truck would be dead every few mornings. The culprit? A faulty BCM that wasn’t letting the interior lighting and retained accessory power circuits go to sleep after the key was off. It was a slow, silent killer for his battery. A simple swap with a correctly programmed 1999-2000 GM BCM fixed the drain instantly and saved him from more wasted parts and frustration.
Symptoms of a Failing BCM
- ✔ Intermittent or non-working power windows, door locks, or mirrors.
- ✔ Erratic interior or exterior lighting behavior (lights staying on or not turning on).
- ✔ Security system faults, including a flashing security light or a no-start condition.
- ✔ Gauges on the instrument cluster behaving strangely or not working at all.
- ✔ False warning lights appearing on the dashboard (e.g., ABS, Airbag).
- ✔ The radio or other accessories not turning off after removing the key.
- ✔ Communication errors when trying to scan the vehicle with a diagnostic tool.
A Simple, Reliable Plug-and-Play Solution
The process is straightforward. After placing your order, simply provide us with your vehicle’s 17-digit VIN. Our technicians will then flash this BCM with the specific software for your truck’s configuration and the newest updates from GM. This ensures perfect compatibility and function right out of the box. While the installation is typically plug-and-play, some vehicles may require simple post-installation procedures.
Post-Installation Requirements
In some cases, additional steps may be needed to sync the new BCM with other modules in your vehicle. These are standard procedures that can be performed with a capable diagnostic tool.
- Airbag System Sync: If the airbag warning light is illuminated after installation, a ‘Setup SDM Primary Key in BCM’ procedure is required to sync the airbag system. This is only necessary if the light appears.
- Brake Pedal Position Relearn: A recalibration of the brake pedal position sensor might be needed on certain models to ensure correct brake light and traction control operation.
This 1999-2000 GM BCM is the most reliable and efficient way to solve your vehicle’s electrical issues and get it back on the road. No core charge means you can keep your original module without the hassle of returning a core.
Frequently Asked Questions
What does the BCM actually do on my truck?
The Body Control Module is a computer that manages and controls most of the non-engine related electronic functions in your vehicle. This includes power windows, door locks, interior and exterior lighting, the anti-theft system (Passlock), warning chimes, and instrument panel gauges.
Why do you need my VIN number?
Your vehicle’s VIN (Vehicle Identification Number) allows us to program the BCM with the exact software and calibrations specified by GM for your truck’s specific options and features. This makes the installation plug-and-play and ensures all systems work correctly.
Is this part difficult to install?
For most DIY mechanics, the physical installation is straightforward. The BCM is typically located under the driver’s or center dash. After disconnecting the battery, you simply unplug the electrical connectors from the old unit and plug them into the new one. The most critical part, the programming, is already done for you.
What if my 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 module (SDM). A procedure called ‘Setup SDM Primary Key in BCM’ must be performed with a bi-directional scan tool to sync the modules and turn off the light.
Will this fix my ‘Security’ light or no-start problem?
Yes, a failing BCM is a very common cause of issues with the GM Passlock anti-theft system, leading to a flashing security light and a crank-no-start condition. A properly programmed BCM will resolve these security system problems.
Do I need to send my old BCM back?
No, there is no core charge for this part. You can keep your original module.