Restore Full Control Over Your Truck’s Electronics
Are you battling bizarre electrical issues in your Chevy Silverado? One moment the power windows work, the next they don’t. The radio cuts out randomly, the security light flashes for no reason, or the HVAC system has a mind of its own. These aren’t just minor annoyances; they’re classic signs of a failing Body Control Module (BCM). As the central command center for your truck’s body electronics, a faulty BCM can cause widespread and frustrating problems. This VIN-programmed BCM, part number 20939138, is the definitive solution for your 2013 Silverado 2500 BCM, designed to restore functionality and reliability without a costly trip to the dealership.
A Technician’s Notebook
I recently had a 2013 Sierra 2500 in the bay—same platform as the Silverado—with a ghost in the machine. The owner was fed up. His dash lights would flicker, the door locks would cycle while driving, and the airbag light was on with a stubborn DTC B1001. He’d already replaced the battery and checked the main grounds. After hooking up my scanner, I saw multiple communication errors pointing to the BCM. Instead of sending him to the dealer for a new module and programming fees, we installed one of our pre-programmed units. In under 10 minutes, the truck was back to normal. The key was providing a module that was already flashed to his VIN, making the repair simple and effective.
Is Your Silverado Showing These Symptoms?
A failing BCM can manifest in numerous ways. If your truck is experiencing any of the following, it’s a strong indicator that the BCM is the culprit:
- ✔ Intermittent or non-functional power windows, door locks, or interior lights.
- ✔ HVAC controls not responding or the blower motor working erratically.
- ✔ The security system acting up, preventing the truck from starting.
- ✔ An illuminated airbag warning light, often with a DTC B1001 stored in the system.
- ✔ Strange instrument cluster behavior or warning lights that come and go.
- ✔ Communication-related Diagnostic Trouble Codes (DTCs) across various modules.
A Straightforward Guide to BCM Replacement
One of the best features of this module is its simple installation. You don’t need to be a master mechanic to get your truck running right again. Just follow these steps:
- Safety First: Always disconnect the negative terminal from your truck’s battery before working on any electrical components.
- Locate the BCM: On most GM trucks of this era, the BCM is located under the driver’s side of the dashboard, near the steering column. It’s a black box with several large electrical connectors.
- Swap the Modules: Carefully unplug the wiring harnesses from the old BCM. Remove any mounting bolts or clips holding it in place. Install the new module, secure it, and plug the connectors back in firmly.
- Reconnect and Test: Reconnect the battery terminal. Start your truck and test all the functions: lights, windows, locks, wipers, and HVAC to ensure everything is working correctly.
- Post-Install Checks: In some cases, an airbag light may remain on. This requires a professional scan tool to perform the ‘Setup SDM Primary Key in BCM’ function. A ‘Brake Pedal Position Relearn’ may also be needed.
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 is focused on the 2013 Silverado 2500 BCM, it also fits the following vehicles. Please verify your part number (20939138) or one of its interchanges (such as 25844480, 25971917, 22860591, and others) to ensure a perfect match.
- ✔ Chevrolet Avalanche 1500 (2007-2011)
- ✔ Chevrolet Silverado 1500/2500/3500 (2007-2013)
- ✔ Chevrolet Suburban 1500/2500 (2007-2011)
- ✔ Chevrolet Tahoe (2007-2011)
- ✔ GMC Sierra 1500/2500/3500 & Denali (2007-2013)
- ✔ GMC Yukon & Yukon XL (2007-2011)
- ✔ Cadillac Escalade, ESV, EXT (2007-2011)
Frequently Asked Questions
Do I need to take my truck to the dealer for programming?
No. This module comes pre-programmed to your vehicle’s specific VIN. This allows for a direct installation without the need for expensive dealership tools or software.
How difficult is the installation?
The physical replacement is very simple and typically takes less than 15 minutes. It’s located under the dashboard and just involves unplugging the old unit and plugging in the new one.
What if my airbag light is still on after installation?
This is a known possibility. It means the new BCM needs to be synced with the airbag system’s SDM. A mechanic with a bi-directional scan tool can perform the ‘Setup SDM Primary Key in BCM’ procedure to resolve this.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or dispose of it without needing to send it back.
Will this fix my check engine light?
While a BCM can cause engine-related symptoms like stalling, it does not typically cause a check engine light. This module is designed to fix body-related electrical functions like lights, windows, and security.
Don’t let a faulty BCM sideline your workhorse. This pre-programmed 2013 Silverado 2500 BCM is the most reliable and cost-effective way to solve those persistent electrical problems and restore your truck to its factory-fresh functionality. Order yours today and get back on the road with confidence.