Restore Full Control and Eliminate Electrical Headaches
If your 1999-2000 GMC Sierra 1500 is plagued by bizarre electrical issues—like power windows with a mind of their own, flickering interior lights, or a security system that randomly immobilizes your truck—you’re likely dealing with a failing Body Control Module (BCM). As the central hub for your truck’s body electronics, a faulty BCM can turn your reliable workhorse into a source of constant frustration. This isn’t just an annoyance; it can be a safety issue when lights or locks don’t operate as expected. This replacement BCM is your direct, reliable solution.
We take the guesswork and dealer hassle out of the equation. Unlike a generic part from a salvage yard, this BCM arrives at your door pre-programmed to your truck’s specific VIN with the latest GM software updates. This critical step ensures seamless communication between all your vehicle’s modules, restoring factory performance and functionality without requiring an expensive trip to the dealership for programming. Simply provide your VIN after purchase, and we’ll handle the rest.
From the Diagnostic Bay: The Case of the Haunted Silverado
I remember a 2000 Silverado 1500 (a sister truck to the Sierra) that came into my shop with a laundry list of complaints. The owner was fed up. The radio would shut off, the dome light would stay on, and sometimes the power locks wouldn’t respond. He’d already replaced the battery and checked fuses. After hooking up my scan tool, I saw a slew of ‘Loss of Communication’ codes (U-codes) pointing to the BCM. These modules, especially from this era, are prone to internal solder joint failures causing intermittent connections. We installed one of our VIN-programmed BCMs, and in under an hour, every single electrical gremlin was gone. It’s a fix I’ve performed hundreds of times, and it’s incredibly satisfying to give an owner their reliable truck back.
Is Your Sierra Showing These Symptoms? Common BCM Failure Signs
- ✔ Intermittent or non-functional power windows, door locks, or mirrors.
- ✔ Erratic interior or exterior lighting behavior (flickering, staying on, or not turning on).
- ✔ The security or anti-theft light is on, potentially causing a no-start condition.
- ✔ Horn sounding unexpectedly or not working at all.
- ✔ Diagnostic trouble codes (DTCs) related to communication errors, such as U1000, U1016, or B-series codes for body components.
- ✔ Wipers operating randomly or not parking in the correct position.
Your Straightforward BCM Installation Guide
- ✔ Safety First: Always disconnect the negative terminal from your truck’s battery to prevent electrical shorts.
- ✔ Locate the BCM: On the 1999-2000 Sierra/Silverado, the BCM is typically located on the driver’s side, up under the dashboard to the left of the steering column.
- ✔ Remove Connectors: Carefully unplug the multiple electrical connectors from the old BCM. They have release tabs that need to be pressed. Do not force them.
- ✔ Swap the Module: Unbolt or unclip the old BCM from its mounting bracket and remove it. Install the new, pre-programmed BCM in its place.
- ✔ Reconnect Everything: Plug all electrical connectors securely into the new BCM. Reconnect the negative battery terminal.
- ✔ Perform Relearns (If Needed): Start the vehicle. Check all functions. If the airbag light is on or brake lights are malfunctioning, you may need to perform the post-installation procedures detailed below with a professional scan tool.
Important Post-Installation Notes
Important Post-Installation Notes
While this module is programmed for plug-and-play installation, some vehicles require additional sync procedures. Please be aware of the following:
Verified Fitment for Your GM Truck or SUV
This Body Control Module is a direct replacement for part numbers 09366801, 19153625, 16257125, 191583625, and others. It is guaranteed to fit the following vehicles:
- 1999-2000 GMC Sierra 1500 / 2500 Pickup (LH dash)
- 1999-2000 Chevrolet Silverado 1500 / 2500 Pickup (LH dash)
- 2000 GMC Safari / Chevrolet Astro (LH dash)
- 1998-2000 GMC Jimmy S15 / Chevrolet Blazer S10 (center dash, ID 16257125)
- 1998-2000 GMC Sonoma / Chevrolet S10/S15 (center dash, ID 16257125)
- 1999-2000 Isuzu Hombre (LH dash)
- 1998 Oldsmobile Bravada (center dash, w/extended build date opt ZN4)
Frequently Asked Questions
Important Post-Installation Notes
While this module is programmed for plug-and-play installation, some vehicles require additional sync procedures. Please be aware of the following: