Is Your GM SUV Experiencing Strange Electrical Issues?
If your Chevrolet Trailblazer, GMC Envoy, or other GMT360 platform vehicle is acting possessed—with flickering lights, malfunctioning power accessories, or random warning messages—a failing Body Control Module (BCM) is the most likely culprit. The BCM is the central command center for your vehicle’s body electronics, managing everything from the interior lights and power windows to the door locks and security system. When it fails, it can cause a cascade of frustrating and unpredictable problems.
Common Symptoms of a Failing Trailblazer Envoy BCM
- ✔ Erratic or non-functional interior and exterior lights.
- ✔ Power windows, door locks, or mirrors working intermittently or not at all.
- ✔ The security system engaging randomly or causing a no-start condition.
- ✔ Instrument cluster gauges behaving erratically or warning lights staying on.
- ✔ Windshield wipers not parking in the correct position or activating on their own.
- ✔ Communication errors (U-codes) when scanned with a diagnostic tool.
- ✔ The radio or climate control system not functioning correctly.
The Direct-Fit, Programmed Solution
Don’t let a faulty BCM keep you off the road. This is a direct replacement Body Control Module for a wide range of 2002-2005 GM SUVs. The critical difference is our service: we program the module to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This ensures that the BCM communicates correctly with your vehicle’s other computers, like the PCM and airbag module, right out of the box. It arrives loaded with the latest software updates from GM, addressing many of the original factory bugs and improving overall performance and stability.
Installation and Post-Install Procedures
Physically replacing the BCM is straightforward for a DIYer with basic tools. However, due to the complexity of modern vehicle systems, a few additional steps, known as relearn procedures, may be required after installation. These procedures sync the new module with other components in your vehicle.
- Airbag System Sync: If the airbag warning light is illuminated 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 system’s Sensing and Diagnostic Module (SDM).
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration might be necessary to ensure the brake lights and traction control system function as intended.
We make the process easier with a no core charge policy. You can keep your old module without the hassle of shipping it back.
Guaranteed Fitment
This module is a direct replacement for part numbers 15191621, 15122670, 15065293, 15114669, and 9352135. It fits a wide range of vehicles, including:
- Chevrolet Trailblazer & Trailblazer EXT (2002-2005)
- GMC Envoy, Envoy XL, & Envoy XUV (2002-2005)
- Oldsmobile Bravada (2002-2004)
- Buick Rainier (2004-2005)
- Isuzu Ascender (2003-2005)
- Saab 9-7X (2005)
Please provide your VIN upon purchase to ensure we program the correct software for your vehicle’s specific options.
Frequently Asked Questions
What is a BCM and what does it do?
The Body Control Module (BCM) is a computer that manages most of your vehicle’s non-engine-related electronic functions. This includes power windows, locks, lights, wipers, security system, and interior accessories.
Is this part truly plug-and-play?
Because we program it to your VIN, it is as close to plug-and-play as possible. It will function immediately upon installation. However, as noted, some vehicles may require a simple relearn procedure for the airbag or brake systems, which may require a professional scan tool.
What information do you need from me?
After you place your order, we will need the 17-digit Vehicle Identification Number (VIN) from your vehicle. This is typically found on your driver’s side dashboard (visible through the windshield) or on your vehicle’s registration.
Will this fix my specific electrical problem?
This module will correct any issues directly caused by a failing BCM. If your vehicle exhibits several of the symptoms listed, such as erratic lights and malfunctioning locks, it is highly likely that this part is the solution.
What happens if the airbag light comes on after I install it?
This indicates that the BCM needs to be electronically synced with the airbag module (SDM). A technician with a bi-directional scan tool can perform the ‘Setup SDM Primary Key in BCM’ procedure in a few minutes to resolve this.
Do I need to return my old BCM?
No. We do not require you to return your original module. There is no core charge associated with this purchase.