Fix Your HUMMER’s Electrical Gremlins for Good
If you’re dealing with bizarre electrical issues in your 2003-2007 HUMMER H2—like the radio acting up, power windows with a mind of their own, or an HVAC system that won’t cooperate—you’ve likely met the culprit: a failing Body Control Module (BCM). As the central command for your vehicle’s comfort and convenience features, when the BCM goes bad, it can cause a cascade of frustrating problems. This isn’t just an inconvenience; it can affect your vehicle’s security and safety. We offer a reliable, permanent solution with our professionally serviced GM Part #15116066 Body Control Module, complete with our expert cloning service.
A Technician’s Notebook: The Case of the Haunted H2
I remember a 2005 HUMMER H2 that rolled into my bay with a list of complaints that sounded like a ghost was in the machine. The owner said his dash lights would flicker, the security light would stay on, and sometimes the truck just wouldn’t start. He’d already replaced the battery and checked the alternator. After hooking up my scanner, I saw a dozen communication codes, all pointing to the BCM. These modules, especially on the GMT800 platform, are notorious for internal solder joint failures and grounding issues over time. We swapped in a programmed BCM, and every single issue vanished instantly. It’s a common failure I’ve diagnosed hundreds of times, and a quality replacement is the only real fix.
Is Your HUMMER H2 Showing These Symptoms?
A failing BCM doesn’t always trigger a check engine light, but it leaves a trail of clues. If you’re experiencing any of the following, your BCM is the likely cause:
- ✔ Intermittent or non-working power windows, door locks, or interior lights.
- ✔ The security system acts erratically, or the vehicle won’t start (displays “Security” on the dash).
- ✔ HVAC controls are unresponsive, or the blower motor works only on high or not at all.
- ✔ The airbag warning light is illuminated, often with a DTC like B1001 (Setup SDM Primary Key in BCM).
- ✔ Strange behavior from gauges, radio, or windshield wipers.
- ✔ Communication loss codes (U-codes) stored in other modules.
Your 5-Minute BCM Installation Guide
Replacing the BCM in your HUMMER H2 is a straightforward job that most DIYers can complete in minutes. Our cloning service makes this a true plug-and-play repair with no dealership trip required.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the BCM: On the 2003-2007 HUMMER H2, the Body Control Module is located on the driver’s side, up under the dashboard to the left of the steering column.
- Remove the Old Module: The BCM is typically held in a plastic bracket. Unplug the several large electrical connectors. They have locking tabs, so be gentle. Once unplugged, the module should slide or pop out of its holder.
- Install the New Module: Seat your new, pre-programmed BCM into the bracket and securely reconnect all the electrical connectors. You’ll hear a click as they lock into place.
- Reconnect & Test: Reconnect the battery terminal. Start the vehicle and test all functions: windows, locks, lights, wipers, and HVAC to confirm the repair was successful.
Post-Installation Checks
In most cases, no further action is needed. However, depending on your vehicle’s specific configuration, a couple of things might need attention. If your airbag light is on, a professional scan tool is required to perform the “Setup SDM Primary Key in BCM” procedure. Rarely, a “Brake Pedal Position Relearn” may also be needed. We always return your original module, so you never have to worry about a core charge.
Verified Fitment For These GM Vehicles
This part, 15116066, is a direct replacement for a wide range of GM trucks and SUVs and interchanges with part numbers 10383536, 15136225, 15136877, 15198116, and more. While this page focuses on the 2003-2007 HUMMER H2 BCM, it also fits the following models:
HUMMER H2 04-07 Body Control (BCM); (LH dash)
AVALANCHE 1500 03-06 Body Control (BCM); (under steering column)
AVALANCHE 2500 02-06 Body Control (BCM); (under steering column)
CADILLAC ESCALADE, ESV, EXT 03-06 Body Control (BCM); (under steering column)
CHEVROLET SILVERADO & GMC SIERRA 1500/2500/3500 PICKUP 03-07 (Classic) Crew Cab
CHEVROLET SUBURBAN & GMC YUKON/XL 1500/2500 03-06 Body Control (BCM); (under steering column)
CHEVROLET EXPRESS & GMC SAVANA VAN 04-07 w/commercial tradesman package (opt PRP)
Frequently Asked Questions
What is a “Cloning Service” and why do I need it?
Cloning is how we make this part plug-and-play. We transfer the critical vehicle-specific data—like your VIN, mileage, and key information—from your original BCM to the replacement unit. This makes the new module an exact electronic match for your truck, avoiding the expensive programming fees charged by dealerships.
Do I need to send my original BCM to you?
Yes. For the cloning service to work, we need your original module to extract the data. After you place your order, we will provide instructions for sending your part to us. We perform the service and ship both your original and the newly programmed replacement back to you promptly.
Is this a difficult part to install myself?
Not at all. For most owners with basic tools, this is a very simple DIY job that takes less than 15 minutes. The module is easily accessible under the driver’s side dashboard. Our step-by-step guide above walks you through the process.
What happens if my airbag light is on after installation?
This is a known possibility on these GM vehicles. It means the new BCM needs to be electronically introduced to the airbag system’s computer (SDM). This requires a bi-directional scan tool to perform the “Setup SDM Primary Key in BCM” procedure. Most local repair shops can perform this service for you if needed.
What is your warranty on this part?
We stand behind our work with a one-year warranty. This covers the module against any defects in workmanship, giving you peace of mind and ensuring a lasting repair for your vehicle.