End the Electrical Headaches in Your GMC Sierra Denali
If you’re dealing with a cascade of bizarre electrical problems in your 2007-2010 GMC Sierra Denali—from flickering lights and a dead climate control system to a persistent airbag warning—you’ve likely met the culprit: a failing Body Control Module (BCM). As the central command for your truck’s body electronics, a faulty BCM can make your reliable vehicle feel unpredictable. This isn’t just an annoyance; it’s a matter of functionality and safety. This replacement Body Control Module, equivalent to GM part 15901388, is the definitive solution, arriving pre-programmed to your truck’s specific VIN for a true plug-and-play fix.
A Technician’s Notebook: The Ghost in the Machine
I once had a 2009 Sierra Denali in my bay that was driving the owner crazy. The radio would cut out, the driver’s side power window worked only when it wanted to, and the HVAC blower was completely dead. The owner had already replaced the blower motor resistor with no luck. After hooking up my scanner, I saw a handful of communication codes and a specific BCM internal fault. Before condemning the module, I did my due diligence: checked the main BCM grounds under the dash and at the A-pillar. They were clean and tight. This confirmed my diagnosis. A failing BCM was scrambling commands across the network. We installed a VIN-programmed module just like this one, and in less than 15 minutes, every single symptom was gone. It’s a common failure, and this is the right way to fix it.
Is Your Sierra Denali Showing These Electrical Faults?
A failing BCM doesn’t usually die silently. It will often broadcast its issues through a variety of frustrating symptoms. In my 20+ years of experience, these are the most common indicators I’ve seen on this GM truck platform. If your vehicle is experiencing any of the following, a faulty 2007-2010 Sierra Denali BCM is the most probable cause:
- ✔ Intermittent or non-functional power windows, door locks, or interior dome lights.
- ✔ HVAC controls that are unresponsive or a blower motor that won’t turn on.
- ✔ An airbag light that stays on, often accompanied by Diagnostic Trouble Code (DTC) B1001.
- ✔ Erratic behavior from the anti-theft system, leading to no-start or stalling conditions.
- ✔ Headlights, taillights, or turn signals that work sporadically or not at all.
- ✔ A dashboard that flickers or displays false warnings.
Your 5-Minute BCM Installation Guide
One of the best features of this module is its straightforward installation. Because we program it to your VIN before shipping, you get to skip the expensive and time-consuming trip to the dealership for programming. You can do this right in your driveway.
- Safety First: Always disconnect the negative terminal from your truck’s battery to prevent any electrical shorts.
- Locate the BCM: On your Sierra Denali, the BCM is located under the driver’s side of the dashboard, usually to the left of the steering column. It’s a black box with several large multi-pin connectors.
- Swap the Modules: Carefully unplug the electrical connectors from the old BCM. They have release tabs that need to be pressed. Once unplugged, remove the old module (it’s typically held by simple clips or a couple of small bolts) and install the new one in its place.
- Reconnect and Test: Plug the connectors firmly into your new BCM. Reconnect the negative battery terminal. Turn the key to the ‘On’ position and test all functions: lights, windows, locks, wipers, and HVAC.
- Post-Install Checks: In most cases, you’re done. However, if the airbag light remains on, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ function. Some models may also require a ‘Brake Pedal Position Relearn’ procedure.
Verified Fitment for Your GM Truck or SUV
This Body Control Module is a direct replacement for part number 15901388 and is compatible with a wide range of General Motors vehicles. It also interchanges with numerous other part numbers, including 25844480, 25835966, 15943678, and 20939137. It is guaranteed to fit the following models, among others:
- GMC Sierra Denali (2007-2010)
- GMC Sierra 1500/2500/3500 (2007-2013)
- GMC Yukon & Yukon XL (2007-2011)
- Chevrolet Silverado 1500/2500/3500 (2007-2013)
- Chevrolet Avalanche (2007-2011)
- Chevrolet Suburban & Tahoe (2007-2011)
- Cadillac Escalade, ESV, EXT (2007-2011)
Note: Please provide your vehicle’s VIN at checkout to ensure we can program the module for perfect compatibility.
Frequently Asked Questions
What does a Body Control Module (BCM) actually do?
The BCM is the ‘brain’ for your vehicle’s body electronics. It controls non-engine related functions like power windows, locks, lights, wipers, the security system, and the climate control (HVAC) system, ensuring they all work together correctly.
Is this module truly ‘plug-and-play’?
Yes. We use your VIN to pre-program the module with the latest GM software for your specific vehicle. This means you can install it yourself without needing a trip to the dealer for expensive programming.
What if my airbag light is on after I install it?
This can happen. It means the new BCM needs to be synced with the airbag system’s Sensing and Diagnostic Module (SDM). This requires a professional scan tool to perform the ‘Setup SDM Primary Key in BCM’ procedure. It’s a quick software sync that any competent repair shop can perform.
Do I need to send my old BCM back?
No. There is no core charge for this part. You can keep your old module, which saves you the hassle and cost of return shipping.
Could a bad ground cause the same problems as a bad BCM?
Absolutely. Before replacing any module, it’s always a smart diagnostic step to check the main power and ground connections for the BCM. A loose or corroded ground can mimic BCM failure. We recommend checking these first to ensure you’re replacing the right part.