Fix Your Truck’s Electrical Gremlins for Good
Are you chasing down bizarre electrical issues in your 2015 Sierra Denali 3500? One minute the power windows work, the next they don’t. The radio cuts out, the security light flashes for no reason, or worse, the truck intermittently refuses to start. As a technician with over two decades of experience, I’ve seen these exact frustrations countless times. The culprit is almost always a failing Body Control Module (BCM), the central nervous system for your vehicle’s comfort and convenience features.
Instead of facing a costly trip to the dealership for a new module and mandatory programming, we offer a smarter, more direct solution. This is a fully tested, replacement BCM that comes pre-programmed using the data from your original module. You simply send us your faulty BCM, we perform a professional data transfer to this replacement unit, and ship it right back to you, ready for installation. It’s the most reliable way to get your truck back to 100% without the dealership hassle. This service restores function and gives you peace of mind.
From the Diagnostic Bay: The Case of the Haunted Sierra
I remember a 2015 Sierra 2500 that came into my shop with a list of symptoms that made it seem possessed. The horn would honk when turning right, the dome light would flicker at random, and the driver’s window had a mind of its own. The owner had already replaced the battery and checked all the fuses. After connecting my scan tool, I saw a slew of communication codes (U-codes) pointing to the BCM. Instead of a complex rewiring job, we used a cloned BCM. The customer sent us his original module, we transferred the data, and he installed the replacement himself in under 30 minutes. The ‘haunting’ was over. This is the power of a correctly programmed module.
Is Your GM Vehicle Exhibiting These Strange Electrical Issues?
A failing BCM doesn’t always trigger a check engine light. Instead, it creates a pattern of confusing electronic problems. Look out for these common indicators:
- ✔ Power windows, door locks, or mirrors operating erratically or not at all.
- ✔ Interior or exterior lights flickering, staying on, or not turning on.
- ✔ The vehicle’s security system engaging randomly, preventing startup.
- ✔ Inconsistent or non-functional radio and infotainment system.
- ✔ Diagnostic Trouble Codes (DTCs) related to communication, such as U0140, U0155, or other U-codes.
- ✔ Intermittent no-start or no-crank conditions where all other systems seem fine.
A Straightforward Guide to Your BCM Installation
Our cloning service makes the physical replacement simple. For most GM trucks and SUVs like the Sierra, the BCM is located under the driver’s side dashboard.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the BCM: On your 2015 Sierra Denali 3500, the BCM is typically found under the steering column, sometimes behind a lower dash panel.
- Disconnect Connectors: Carefully unplug the multiple wiring harnesses connected to the module. They have locking tabs that need to be depressed to release them. Do not force them.
- Remove the Old Module: Unbolt or unclip the original BCM from its mounting bracket and set it aside to ship to us.
- Install the New Module: Once you receive the programmed replacement from us, simply mount it in place and reconnect all wiring harnesses until they click securely.
- Reconnect and Test: Reconnect the negative battery terminal. Start the vehicle and test all body functions—lights, locks, windows, radio, etc.—to confirm the repair.
Important Post-Installation Information
While our programming handles the critical vehicle-specific data, some vehicle safety systems may require a ‘handshake’ with the new BCM. This is normal and can often be done with a high-end scan tool.
- Airbag System Sync: If your airbag warning light is on after installation, a procedure called ‘Setup SDM Primary Key in BCM’ is needed to sync the systems. This is a security measure and requires a professional diagnostic tool.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration might be necessary to ensure brake lights and traction control function correctly.
Disclaimer: We are not responsible for any labor costs. Always consult a factory service manual or a qualified technician if you are unsure about any step. No core charge is required; you can keep your original module.
Verified Vehicle Compatibility
This BCM is a direct replacement for part number 13506936 and is also compatible with part numbers 13592137, 13506935, 13587704, and 13594764. It fits a wide range of 2015-2018 General Motors vehicles. Please verify your part number and model from the list below.
- ATS: 2015, 2016
- Corvette: 2015
- CTS: 2015, 2016
- Escalade & Escalade ESV: 2015
- Impala: 2015-2016 (New Style)
- Sierra 1500 / Denali 1500: 2015
- Sierra 2500 / Denali 2500: 2015
- Sierra 3500 / Denali 3500: 2015
- Silverado 1500: 2015
- Silverado 2500: 2015
- Silverado 3500: 2015
- Sonic: 2015-2018
- Suburban 1500: 2015
- Tahoe: 2015
- XTS: 2015
- Yukon / Yukon XL 1500: 2015
Frequently Asked Questions
How does the programming service work?
After you place your order, we will contact you with instructions to ship your original BCM to us. We then extract the unique data and transfer it to the replacement module. This ‘cloning’ process makes the new BCM a perfect match for your vehicle, eliminating the need for dealer programming. We then ship the ready-to-install module back to you.
Do I need to do any programming myself?
No, the core programming is completely handled by us. In some cases, as noted above, a simple ‘relearn’ or ‘sync’ procedure for the airbag or brake pedal sensor may be needed after installation, which can be done by most repair shops with a professional scan tool.
Is this a guaranteed fix for my vehicle’s problems?
This module will fix problems directly caused by a faulty BCM. The symptoms listed above are strong indicators of BCM failure. However, proper vehicle diagnosis is key, as similar symptoms can sometimes be caused by wiring or sensor issues.
What if my original BCM is completely dead or missing?
Our standard service relies on data from your original module. If your module is missing, water-damaged, or completely non-communicative, please contact us before ordering to discuss potential options.
What is the turnaround time?
We pride ourselves on a fast turnaround. The programming is typically completed within 1-2 business days after we receive your original module. We will send you a tracking number as soon as your new BCM is on its way back to you.