Are you tired of chasing electrical gremlins in your GM truck or SUV? Flickering lights, malfunctioning power windows and locks, a security light that won’t turn off, or a vehicle that refuses to start can all point to one culprit: a failing Body Control Module (BCM). As the central command center for your vehicle’s body electronics, a faulty BCM can create a host of frustrating and unpredictable problems. This isn’t just an inconvenience; it can affect your truck’s security and daily usability.
This is your direct, reliable solution. We offer a replacement Body Control Module, part number 16257125, that arrives at your door fully programmed to your vehicle’s specific VIN. Forget expensive dealership visits and the hassle of finding a shop with the right tools. We handle the complex programming for you, loading the latest GM software updates before we ship. This ensures seamless integration and restores your vehicle’s functions to factory specifications.
Case Study: A Tricky Diagnosis
I remember a 2000 Sierra 1500 that came into my bay with a classic BCM failure story. The owner complained of the radio turning on and off by itself and the dome lights flickering randomly. He’d already replaced the battery and checked the grounds. After connecting my scan tool, I found multiple communication loss codes (U-codes) with various modules. The BCM wasn’t properly communicating on the data bus. Instead of a complex wiring repair, a new, properly programmed BCM was the fix. This is a textbook example of how a failing 1999-2000 Silverado 2500 BCM can cause system-wide electrical chaos.
Is Your Truck Showing These Symptoms?
- ✔ Erratic or non-functional power windows, door locks, and mirrors.
- ✔ Interior or exterior lights flickering, staying on, or not working at all.
- ✔ The security or anti-theft light is illuminated, preventing the engine from starting.
- ✔ The horn honks unexpectedly or doesn’t work when pressed.
- ✔ Wipers operate intermittently or won’t turn off.
- ✔ Communication loss codes (U-codes) stored in the system.
- ✔ False door ajar warnings on the instrument cluster.
A Straightforward Guide to Installation
Replacing the BCM is a manageable job for a DIY enthusiast. It’s typically located under the driver’s side of the dashboard.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts.
- Locate the BCM: On most of these trucks, you’ll find it under the driver’s side dash, to the left of the steering column. You may need to remove a 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 or unclip the old BCM and remove it.
- Install the New Module: Mount your new, pre-programmed BCM in the same location. Securely plug in all the electrical connectors, ensuring they click into place.
- Reconnect and Test: Reconnect the negative battery terminal. Turn the key to the ‘On’ position and test all body functions—lights, locks, windows, wipers, etc.—to confirm proper operation.
Important Post-Installation Notes
While our VIN programming handles the critical setup, some vehicles may require additional sync procedures after installation:
- Airbag System Sync: If your airbag warning light is on after installation, a professional scan tool is needed to perform the “Setup SDM Primary Key in BCM” procedure. This syncs the new BCM with the airbag module.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration might be necessary for correct brake light and traction control operation.
- No Core Charge: You can keep your old part. There is no core charge and no need to send the original module back to us.
Disclaimer: Vehicle systems vary. We always recommend consulting a factory service manual or a qualified technician if you are unsure about any step.
Will This Fit My Vehicle?
This BCM is a direct replacement for part number 16257125 and is also compatible with part numbers 19153625, 8191536250, 191583625, 8093668010, 8162571250, and 09366801. It is guaranteed to fit the following models:
- 1999-2000 Chevrolet Silverado 1500/2500 Pickup
- 1999-2000 GMC Sierra 1500/2500 Pickup
- 1998-2000 Chevrolet S10 / GMC S15/Sonoma
- 1998-2000 Chevrolet Blazer / GMC Jimmy S15
- 2000 Chevrolet Astro / GMC Safari
- 1998 Oldsmobile Bravada (w/ extended build date opt ZN4)
- 1999-2000 Isuzu Hombre
Frequently Asked Questions
Do I need to do any programming myself?
No. We flash the module with the latest GM software using the VIN you provide during checkout. It arrives ready to be installed, saving you a trip to the dealership.
What is a BCM and what does it do?
The Body Control Module (BCM) is a computer that controls most of your vehicle’s non-engine-related electronic features, like power windows, locks, lights, wipers, and the security system.
Is this a difficult part to replace for a DIYer?
For most individuals with basic mechanical skills, this is a straightforward replacement. The main challenge is accessing the module under the dashboard. No special tools are typically required for the removal and installation itself.
Will this fix my ‘Security’ light and no-start problem?
A faulty BCM is a very common cause of an illuminated security light and a resulting no-start condition in these GM vehicles. While other issues can cause this, replacing a failed BCM is often the correct solution.
What happens if my airbag light comes on after installation?
This indicates the new BCM needs to be electronically ‘introduced’ to the airbag system’s computer (SDM). A repair shop with a professional-grade bidirectional scan tool can perform the ‘Setup SDM Primary Key in BCM’ procedure in a few minutes to resolve this.
Do I need to send my old BCM back?
No, there is no core charge for this part. You can keep your original module.