Restore Full Electrical Function to Your HUMMER H2
If you’re dealing with bizarre electrical issues in your 2008-2009 HUMMER H2—like power windows with a mind of their own, flickering dash lights, or a security system that prevents your truck from starting—a failing Body Control Module (BCM) is the most likely culprit. The BCM is the central nervous system for your vehicle’s body electronics, and when it fails, it can cause a cascade of frustrating and seemingly unrelated problems. This direct-fit BCM is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN, saving you a costly and time-consuming trip to the dealership.
A Technician’s Notebook: The Phantom No-Start H2
I had a 2008 HUMMER H2 in my bay that was a real head-scratcher for the owner. It would intermittently refuse to start, the security light would flash, and sometimes the radio would stay on after the key was removed. The battery and starter checked out perfectly. After hooking up my scan tool, I found a slew of communication codes (U-codes) pointing to a network issue. Experience has taught me that on these GM platforms, this combination of symptoms almost always leads back to the BCM. We swapped in a VIN-programmed module, and all the electrical gremlins vanished instantly. It’s a common failure point that can mimic a dozen other problems.
Common Signs of a Failing BCM
A faulty BCM can manifest in numerous ways. If your H2 is experiencing any of the following, it’s time to consider a replacement. Proper diagnosis is key, but these are the classic symptoms I’ve seen in my shop hundreds of times.
- ✔ Power windows, door locks, or mirrors operating erratically or not at all.
- ✔ Interior or exterior lights flickering, staying on, or not turning on.
- ✔ The security system light is illuminated, or the vehicle won’t start due to a false theft alert.
- ✔ Horn honking randomly or not working when pressed.
- ✔ Diagnostic Trouble Codes (DTCs) related to communication loss, such as U0140 (Lost Communication With Body Control Module).
- ✔ Wipers activating on their own or not responding to the switch.
A Straightforward Guide to Your BCM Installation
Installing your new 2008-2009 HUMMER H2 BCM is a manageable job for a DIY enthusiast. Since we program it for you, the most complex part of the process is already handled.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before working on any electronic components.
- Locate the Old BCM: In the 2008-2009 HUMMER H2, the Body Control Module is located on the driver’s side, mounted to the LH firewall, typically up under the dashboard.
- Perform the Swap: Carefully release the locking tabs on the electrical connectors and unplug them. Unbolt the old module, mount the new one in its place, and securely plug in all the connectors. Give them a gentle tug to ensure they’re seated properly.
- Power Up and Verify: Reconnect the negative battery terminal. Start the vehicle and test all related functions: lights, locks, windows, wipers, and horn to confirm the repair.
Important Post-Installation Steps
While this module is programmed for your vehicle, certain security and safety systems may need to be re-synced after installation. This is a normal part of the process.
- Airbag System Sync: If the airbag warning light is on after installation, a procedure called “Setup SDM Primary Key in BCM” must be performed using a professional-grade diagnostic tool. This ensures the new BCM and the airbag system are communicating correctly.
- Brake Pedal Position Relearn: In some cases, a brake pedal position sensor relearn may be required. This recalibrates the sensor to ensure your brake lights and traction control system function as intended.
- No Core Charge: We make it easy. There is no core charge on this part, so you don’t have to worry about the cost or hassle of sending your old module back.
Disclaimer: Vehicle systems can vary. We always recommend consulting a factory service manual or a certified technician if you are unsure about any step of the diagnostic or installation process.
Verified Vehicle Compatibility
This Body Control Module is a direct replacement for part number 15819552 and is interchangeable with a wide range of other GM part numbers. It is guaranteed to fit the following models, among others:
ACADIA 07-12
AVALANCHE 1500 10
CAPRICE 11-13
CAPTIVA SPORT 12
CTS 08-13
DTS 06-11
ENCLAVE 08-12
EQUINOX 07-09
ESCALADE 10
ESCALADE ESV 10
ESCALADE EXT 10
EXPRESS 1500 VAN 08-12
EXPRESS 2500 VAN 08-12
EXPRESS 3500 VAN 08-12
G8 08-09
IMPALA 06-13
LUCERNE 06-11
MONTE CARLO 06-07
OUTLOOK 07-10
SAVANA 1500 VAN 08-12
SAVANA 2500 VAN 08-12
SAVANA 3500 VAN 08-12
SRX 07-09
STS 10
SUBURBAN 1500 10
TAHOE 10
TORRENT 07-09
TRAVERSE 09-12
VUE 08-10
YUKON 10
YUKON XL 1500 10
This module also replaces the following part numbers: 10382479, 15093910, 15276271, 15299986, 15828601, 15837419, 15872388, 15872421, 15880684, 15921352, 15921353, 15948438, 15948439, 20815898, 20839063, 20864767, 20864768, 20921435, 20921436, 20935349, 22860591, 25826124, 25826125, 25847588, 25847589, 25892622, 25910474, 25934762, 25934763, 95151084.
Frequently Asked Questions
Frequently Asked Questions
What exactly does the Body Control Module do?
The BCM acts as the main computer for your vehicle’s non-engine related functions. It controls features like power windows, interior/exterior lighting, door locks, the security system, and wipers, ensuring everything works together seamlessly.
Is this BCM ready to install right out of the box?
Yes, it is. We program the module with the latest GM software using the VIN you provide at checkout. This critical step ensures it communicates perfectly with your H2’s other systems, eliminating the need for dealership intervention.
Do I have to send my old BCM back?
No. We do not require a core return. This saves you the time, hassle, and extra shipping costs associated with a core charge.
What if my airbag light is on after I install the new module?
This is not uncommon. It simply means the new BCM needs to be electronically introduced to the airbag system’s computer (SDM). A mechanic with a professional scan tool can perform the ‘Setup SDM Primary Key in BCM’ procedure in a few minutes to resolve this.
How do I know for sure that my BCM is the problem?
While the symptoms listed are strong indicators, a definitive diagnosis is always best. A failing BCM often causes multiple, strange electrical faults at once. If you’re experiencing a wide array of electronic issues, the BCM is the most probable cause.