End the Electrical Chaos in Your GM Vehicle
Are you chasing down bizarre electrical issues in your truck or SUV? Flickering headlights, intermittent power windows, a security light that won’t turn off, or a battery that drains overnight are classic signs of a failing Body Control Module (BCM). As the central hub for your vehicle’s body electronics, a faulty BCM can create a cascade of frustrating and seemingly unrelated problems. In my 20+ years of diagnostics, I’ve seen how a bad BCM can make a perfectly good vehicle feel unreliable. This isn’t just an inconvenience; it’s a critical component for proper function and safety.
We offer a straightforward, reliable solution. This is a replacement BCM, compatible with part numbers like 13594768 and 13594692, that comes ready for installation. How? We use a specialized cloning service. You simply ship us your original BCM, and we transfer all its vital dataāincluding VIN, mileage, and key programmingāto this replacement unit. The result is a true plug-and-play module, eliminating the need for expensive dealership visits and complex programming tools. This service is the most effective way to get your 2015 Sierra 3500 BCM or other compatible module working correctly again.
From the Diagnostic Bay: The Case of the Phantom Battery Drain
A customer brought in his 2015 Silverado 2500, a brother to the Sierra, with a persistent battery drain that two other shops couldn’t solve. Every morning, the battery was dead. We checked for the usual suspectsāalternator, glove box light, aftermarket accessoriesāand found nothing. After connecting a scan tool, we noticed the BCM wasn’t allowing other modules to go into ‘sleep mode’ after the key was off. It was keeping the network awake all night, slowly killing the battery. We performed our BCM cloning service, and the new module immediately allowed the vehicle to enter its proper low-power state. The phantom drain was gone. This is a common failure mode I’ve diagnosed hundreds of times on these GM platforms.
Common Signs of a Failing GM Body Control Module
- ā Erratic or non-functional interior and exterior lights (headlights, dome lights, dash lights).
- ā Power windows, door locks, or mirrors working intermittently or not at all.
- ā The anti-theft or security system light stays on, preventing the vehicle from starting.
- ā Unexplained battery drain that leaves you with a dead battery.
- ā Horn honking randomly or not working when pressed.
- ā Communication error codes with other modules, such as U0140 (Lost Communication With Body Control Module).
- ā Wipers turning on by themselves or not responding to the switch.
A Straightforward Guide to BCM Installation
- ā Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- ā Locate the BCM: On most compatible trucks and SUVs like the 2015 Sierra, the BCM is located under the driver’s side of the dashboard, often near the steering column or against the firewall. On sedans, it may be in the dash or a hinge pillar.
- ā Disconnect and Remove: Carefully unplug all electrical connectors from the original BCM. They have locking tabs that need to be depressed. Once disconnected, unbolt or unclip the module from its mounting bracket.
- ā Install the New Module: Mount your newly programmed BCM in the same location and securely reconnect all the electrical connectors. You should hear a ‘click’ as they lock into place.
- ā Reconnect Power: Reconnect the negative battery terminal.
- ā Verify Function: Start the vehicle and test all related functions: lights, locks, windows, wipers, and horn. Note the post-installation procedures below.
Important Post-Installation Information
While our cloning service makes this a near plug-and-play process, some vehicle systems may require a final handshake. If your airbag warning light is illuminated after installation, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure. Additionally, some models may require a ‘Brake Pedal Position Relearn’ to ensure proper brake light and stability control function. Always consult a factory service manual for your specific vehicle if you are unsure.
Verified Vehicle Compatibility List
This BCM and programming service is a direct solution for a wide range of GM vehicles. Please verify your part number (13594692, 13594768, etc.) and vehicle model. This is a solution for the 2015 Sierra 3500 BCM and many others, including:
- ATS (2014): Body Control (BCM); (on firewall)
- CAPRICE / SS CAPRICE (2014-17): Body Control (BCM)
- CORVETTE (2014): Body Control (BCM); (LH dash)
- CTS (2014): Body Control (BCM); Sdn, VIN A (4th digit, New Style), (LH dash)
- ESCALADE / ESV (2015): Body Control (BCM); (under steering column), w/o model year break point
- IMPALA (2015-16): Body Control (BCM); VIN 1 (4th digit, New Style), (LH dash), ID 13594692
- IMPALA (2017-19): Body Control (BCM); (LH Dash)
- SIERRA / SILVERADO 1500 (2014): Body Control (BCM); (under steering column)
- SIERRA DENALI 1500 (2014): Body Control (BCM); (under steering column)
- SIERRA / SILVERADO 2500 / 3500 (2015): Body Control (BCM); ID 13594692
- SIERRA DENALI 2500 / 3500 (2015): Body Control (BCM); ID 13594692
- SUBURBAN 1500 (2015): Body Control (BCM); (under steering column), w/o model year break point
- TAHOE (2015): Body Control (BCM); (under steering column), w/o model year break point
- XTS (2014): Body Control (BCM); (left front hinge pillar)
- YUKON / YUKON XL 1500 (2015): Body Control (BCM); (under steering column), w/o model year break point
How does the programming service work?
After you place your order, we will provide you with instructions to ship your original BCM to us. Once we receive it, our technicians will transfer all the necessary data to the replacement module. We then ship the programmed module back to you, typically within 1-2 business days.
Do I need to send my keys?
No, you do not need to send your keys. All the necessary security information is stored within your original BCM and will be cloned directly to the replacement unit, ensuring your existing keys work perfectly.
Is this really plug-and-play?
Yes, for over 95% of installations. Because we clone your original data, the replacement BCM is recognized by your vehicle’s other computers, avoiding the need for programming. In rare cases, a simple relearn procedure like for the airbag or brake pedal sensor may be required, as noted above.
What if my original BCM is completely dead or not communicating?
In most cases, even if the BCM has failed, we can still extract the necessary data. If your module has suffered extreme physical or water damage, please contact us first to discuss options. We can often still provide a working solution.
Is there a core charge?
No, there is no core charge or need to return your old part after installation. The initial module you send us is used for the data transfer and will not be returned. You keep the original after you receive the programmed replacement.