Fix Your Truck’s Electrical Problems for Good
If your 2013 GMC Sierra 2500 is experiencing bizarre electrical issues like flickering lights, a dead instrument cluster, or random security system alerts, a failing Body Control Module (BCM) is the likely culprit. As the central command for your truck’s body electronics, a faulty BCM can cause a cascade of frustrating problems. This replacement module, part number 25823559 (interchangeable with 25844480 and others), is the definitive solution. We offer an expert Cloning Service, transferring all the essential data from your original module to this new one, ensuring a true plug-and-play installation without a costly trip to the dealership.
A Technician’s Notebook: The Ghost in the Machine
I once had a 2011 Silverado 2500 in my bay that was driving the owner mad. The radio would turn on by itself, the door locks would cycle while driving, and the HVAC blower was completely erratic. He had spent hundreds chasing what he thought were grounding issues. After hooking up my scanner, I saw a dozen communication codes pointing back to the BCM. A failing BCM can mimic a bad ground perfectly, sending confusing signals across the vehicle’s network. We performed a cloning service onto a new module, and the truck was back to normal in an hour. It’s a classic case where replacing the central component solves multiple, seemingly unrelated problems.
Is Your GM Truck Showing These Symptoms?
- ✔ Your power windows, door locks, or interior lights work intermittently or not at all.
- ✔ The HVAC system is unresponsive, or the blower motor won’t turn on.
- ✔ An airbag warning light is illuminated, often with a DTC like B1001 (Setup SDM Primary Key in BCM).
- ✔ The security system acts up, causing no-start conditions or stalling.
- ✔ You’re experiencing strange electrical behavior that you can’t trace to a specific fuse or wire.
- ✔ Your scanner shows multiple communication or body-related diagnostic trouble codes.
A Straightforward Guide to Our Cloning and Installation Process
Our goal is to make this repair as simple as possible. Our cloning service means you don’t need any special diagnostic tools for programming. Just follow these steps.
- Place Your Order: Purchase this module and we will send you shipping instructions.
- Send Us Your Module: Carefully remove your original BCM (typically located under the driver’s side dash) and ship it to us.
- We Clone Your Data: Our technicians will professionally transfer the unique configuration, key data, and software from your original BCM to this replacement unit.
- Receive Both Modules: We ship your original module back to you along with the ready-to-install replacement. We do not keep your original part.
- Install the New BCM: Disconnect your truck’s negative battery terminal. Unplug the connectors from the old BCM location and plug them into your newly cloned module. Re-mount it securely.
- Reconnect and Test: Reconnect the battery. Start your truck and test all functions—lights, locks, windows, wipers, and HVAC—to confirm the repair is complete.
- Post-Install Checks: In some cases, an airbag light may persist or a brake position relearn might be needed. These procedures require a professional scan tool but are often not necessary. Please see our FAQ for more details.
Verified Vehicle Compatibility
This Body Control Module is a direct-fit replacement for a wide range of General Motors trucks and SUVs. While this page focuses on the 2013 Sierra 2500 Body Control Module, it is also compatible with the following vehicles. Always verify your part number before ordering.
Chevrolet: Avalanche 1500 (2007-2013), Silverado 1500/2500/3500 (2007-2013), Suburban 1500/2500 (2007-2013), Tahoe (2007-2013)
GMC: Sierra 1500/2500/3500 & Denali Models (2007-2013), Yukon & Yukon XL (2007-2013)
This module replaces part numbers: 25835966, 15263363, 15263497, 15878753, 15284816, 15943678, 15926094, 15940214, 25790508, 25790509, 25823558, 25823559, 25835965, 25844479, 25971916, 25971917, 15901388, 20939137, 20939138, 22860591.
Frequently Asked Questions
Frequently Asked Questions
What exactly is a “Cloning Service”?
Cloning is a process where we copy the complete software and vehicle-specific data (like VIN, key information, and option content) from your original BCM directly onto the replacement module. This makes the new module an exact digital copy of the old one, eliminating the need for dealership programming.
Do I need to get this programmed by a dealer after I install it?
No. Because we clone your original module’s data, this BCM will be plug-and-play. You will not need to visit a dealer or mechanic for programming, saving you time and money.
What is the ‘Setup SDM Primary Key in BCM’ procedure?
This is a specific relearn procedure that syncs the BCM with the airbag system’s Sensing and Diagnostic Module (SDM). It is only required if the airbag warning light stays on after installation. This must be done with a bi-directional scan tool.
Why do you send my old module back?
We always return your original part. We believe you should keep the components you paid for. This also means there is no core charge or hassle with core returns.
Is this a difficult part for a DIYer to replace?
The physical replacement is very straightforward. The BCM is usually held in place by a few clips or small bolts under the driver’s side dashboard. The most important part is ensuring the connectors are seated securely. The entire swap typically takes less than 15 minutes.
What is your warranty on this module?
This module is backed by our one-year warranty, covering any defects in the part or the cloning service. We stand by our work to ensure your vehicle is repaired correctly.