Restore Full Control Over Your Truck’s Electronics
Are you battling bizarre electrical problems in your GM truck or SUV? Flickering lights, unresponsive power windows, a dead HVAC system, or a security light that won’t turn off are classic signs of a failing Body Control Module (BCM). As the central command for your vehicle’s body accessories, a faulty BCM can make your daily drive frustrating and unpredictable. This OEM-quality replacement, part number 25790508, is the definitive solution, arriving expertly programmed to your vehicle’s VIN for a true plug-and-play installation.
Case Study: A Tricky Diagnosis
I remember a 2013 GMC Sierra 3500 that came into my shop with a laundry list of complaints: intermittent radio failure, dome lights staying on, and occasional no-start issues. The owner had already replaced the battery and checked the alternator. After hooking up my scanner, I saw a dozen communication codes pointing everywhere. From experience, I know these ghost-in-the-machine problems often lead back to the BCM. A quick check of the BCM’s ground connection under the dash confirmed it was secure. The module itself was the culprit. We installed a VIN-programmed 2013 Sierra 3500 BCM, and within 10 minutes, every single electrical gremlin was gone. It’s a fix I’ve performed hundreds of time on these GM platforms.
Is Your Truck Exhibiting These Electrical Gremlins?
A failing BCM doesn’t always mean a total shutdown. It often starts with small, annoying issues that grow worse over time. Here’s what to look for:
- ✔ Unresponsive or erratic power windows, door locks, or mirrors.
- ✔ Interior or exterior lights that won’t turn on or off.
- ✔ HVAC controls or the blower motor working intermittently or not at all.
- ✔ The security system preventing the vehicle from starting or causing stalls.
- ✔ An airbag warning light on the dash, often accompanied by DTC B1001 (Setup SDM Primary Key in BCM).
- ✔ A flurry of communication-related Diagnostic Trouble Codes (DTCs).
A Straightforward Guide to Installation
Getting your truck back to 100% is easier than you think. This module is designed for a simple, direct-fit replacement that most DIYers can complete in under 10 minutes.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before working on any electronic components.
- Locate the BCM: On most compatible models, the BCM is located under the driver’s side dashboard, near the steering column. It’s typically held in place by clips or a few small bolts.
- Swap the Module: Carefully unplug the electrical connectors from the old BCM. They have locking tabs, so be sure to depress them fully before pulling. Remove the old module and install the new one in its place.
- Reconnect and Test: Securely plug all connectors into your new 2013 Sierra 3500 BCM. Reconnect the battery terminal. Start the vehicle and test all functions: lights, wipers, windows, locks, and HVAC to confirm the repair was successful.
- Post-Install Note: In some cases, particularly if you had an airbag light on before, you may need a professional scan tool to perform the ‘Setup SDM Primary Key in BCM’ function to clear the light. This syncs the new BCM with the airbag system.
Will This Fit My Truck?
This module is a direct replacement for a wide range of General Motors vehicles. Please verify your model and year below. This part is interchangeable with numerous part numbers, including 25844480, 25835966, 15943678, and 25790508.
ESCALADE & ESV & EXT 07-11
SIERRA 1500 PICKUP 07-11
SIERRA 2500 PICKUP 07-13
SIERRA 3500 PICKUP 07-13
SIERRA DENALI 07-11
SIERRA DENALI 2500/3500 11-13
SILVERADO 1500 PICKUP 07-11
SILVERADO 2500 PICKUP 07-13
SILVERADO 3500 PICKUP 07-13
SUBURBAN 1500/2500 07-11
TAHOE 07-11
YUKON & YUKON XL 1500/2500 07-11
Frequently Asked Questions
Frequently Asked Questions
Do I need to take this BCM to the dealership for programming?
No. We program the module to your vehicle’s specific VIN before shipping. It arrives ready for a plug-and-play installation, saving you time and money.
What tools are required for installation?
In most cases, you’ll only need basic hand tools, such as a socket set or a screwdriver, to access the module under the dashboard. No special tools are needed for the swap itself.
My airbag light is on. Will this fix it?
This module will often resolve the underlying electronic fault causing the airbag light, especially with code B1001. However, after installation, the light may need to be cleared by performing the ‘Setup SDM Primary Key in BCM’ procedure with a compatible high-level scan tool.
Is there a core charge for my old part?
No, there is no core charge. You can keep or discard your old module without the hassle of sending it back.
How can I be sure the BCM is the problem?
While the symptoms listed are strong indicators, a proper diagnosis is always recommended. If multiple, unrelated electronic systems are failing simultaneously, the BCM is the most likely cause. This 2013 Sierra 3500 BCM is the reliable fix for those confirmed failures.