Is Your GMC Envoy, Trailblazer, or Bravada Experiencing Bizarre Electrical Issues?
If you’re dealing with flickering lights, malfunctioning power windows, a security system that acts up, or a battery that mysteriously drains overnight, the culprit is often a failing Body Control Module (BCM). The BCM is the central command center for your vehicle’s body electronics, and when it starts to go, it can create a cascade of frustrating and seemingly unrelated problems. Don’t let electrical gremlins take control of your SUV. This direct-fit, VIN-programmed BCM is the definitive solution to restore full functionality and peace of mind.
From the Diagnostic Bay
We had a 2004 Trailblazer come into the shop with a classic BCM failure symptom: the interior dome lights wouldn’t turn off, no matter what. The owner had been disconnecting his battery every night to keep it from dying. He’d already replaced the battery and checked all the door jamb switches. A quick scan showed communication errors with the BCM. We installed one of our pre-programmed modules, and the problem was solved in minutes. The lights worked perfectly, and the customer was thrilled to have a reliable vehicle again without an expensive trip to the dealer for programming.
Common Symptoms of a Failing BCM
- ✔ Power windows or door locks operating erratically or not at all.
- ✔ Interior or exterior lights staying on or not turning on.
- ✔ The security or anti-theft light flashing, preventing the engine from starting.
- ✔ Gauges on the instrument cluster behaving strangely or not working.
- ✔ Intermittent no-start conditions where the engine cranks but won’t fire.
- ✔ Unexplained parasitic battery drain that kills your battery overnight.
- ✔ Horn honking unexpectedly or not working when pressed.
The Plug-and-Play Solution for Your 2002-2005 Envoy XL BCM
Replacing a BCM used to mean a trip to the dealership for costly programming and calibration. We’ve eliminated that step. This module is not just a replacement part; it’s a complete service. When you place your order, you provide us with your vehicle’s VIN. Our technicians then flash the module with the latest, most stable software directly from GM, ensuring it is perfectly matched to your vehicle’s specific options and configuration. It arrives at your door ready for installation, saving you time, money, and hassle.
Installation and Post-Install Procedures
Installation is straightforward for a DIYer with basic tools. The BCM is typically located on or near the interior fuse box. Once installed, your vehicle should start and run. However, due to the complexity of modern vehicle systems, a couple of additional steps may be required:
- Airbag System Sync: If the airbag warning light is illuminated after installation, a ‘Setup SDM Primary Key in BCM’ procedure is necessary. This requires a professional-grade scan tool to sync the new BCM with the airbag system.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration might be needed to ensure proper function of the brake lights and traction control system.
We also make the process easier with our No Core Charge policy. You don’t need to worry about the cost or hassle of sending your old, faulty module back to us. Keep it, recycle it, or dispose of it as you see fit.
Guaranteed Fitment
This BCM is a direct replacement for a wide range of GM mid-size SUVs built on the GMT360 platform. It is compatible with part numbers 15122670, 15065293, 15114669, 15191621, and 9352135. It fits the following vehicles:
- 2002-2005 GMC Envoy, Envoy XL, Envoy XUV
- 2002-2005 Chevrolet Trailblazer, Trailblazer EXT
- 2002-2004 Oldsmobile Bravada
- 2003-2005 Isuzu Ascender
- 2004-2005 Buick Rainier
- 2005 Saab 9-7x
Please verify your part number or contact us with your VIN to confirm compatibility before ordering.
Frequently Asked Questions
What does a BCM do on a GMC Envoy?
The Body Control Module (BCM) acts as the central computer for your Envoy’s electronic accessories. It controls functions like power windows, door locks, interior and exterior lighting, the security system, and the instrument cluster gauges.
Is this BCM truly plug-and-play?
Yes, it is pre-programmed to your vehicle’s VIN and will allow the vehicle to start and run upon installation. However, depending on your specific model, post-installation procedures like an airbag system sync or brake pedal position relearn may be required using a professional scan tool to clear warning lights.
Where is the BCM located on my 2003 Trailblazer?
On most GMT360 platform vehicles like the Trailblazer and Envoy, the BCM is integrated with or located next to the interior fuse panel, typically found under the rear driver’s side seat or in the center console area.
Do I need to send my old BCM back?
No. This part is sold with no core charge. You can keep your original module without any additional fees or hassle.
What happens if my airbag light comes on after installation?
If the airbag light is on, it means the new BCM needs to be electronically ‘introduced’ to the airbag’s computer (SDM). A technician with a high-level scan tool will need to perform the ‘Setup SDM Primary Key in BCM’ procedure to sync the modules and turn off the light.