2007 – 2011 GMC SIERRA 3500 Body Control Module (BCM) 20939137 – Pre-Programmed to Your VIN with One-Year Warranty from Highway71AutoParts.com
Ever dealt with your GMC Sierra 3500’s power windows refusing to budge on a rainy haul, or the HVAC blower cutting out mid-drive in freezing winters? As a seasoned mechanic who’s fixed countless heavy-duty trucks like yours, I know how a failing body control module can turn a reliable workhorse into a headache. Questions like “Why is my 2007-2011 GMC Sierra 3500 BCM triggering airbag lights and DTC codes?” or “How to fix intermittent door locks in my Sierra 3500 without dealership visits?” are common in my shop. The solution? Our OEM-spec GM BCM, part number 20939137, pre-programmed to your exact VIN for seamless integration. This unit oversees vital systems from lighting and wipers to security and climate controls, clearing persistent issues and restoring peak performance. Compatible across 2007-2013 GM lineup, including interchangeable numbers like 25844480, 25835966, and others, it fits your Sierra 3500 perfectly, enhancing towing reliability and daily drivability. Beyond basic replacement, it prevents cascading electrical failures, saving you time and money on diagnostics.
Common Issues & How This Fixes Them
In my two decades of wrenching on GM trucks, I’ve seen BCM failures hit hard, especially in rugged models like the 2007-2011 GMC Sierra 3500 used for towing or off-road work. One frequent problem is loss of HVAC controls, where the blower fan acts up intermittently—often due to degraded internal circuits from moisture or vibration, leading to uncomfortable cabins during long hauls. This BCM replacement stabilizes those signals, ensuring consistent airflow and clearing related DTCs like U codes. Another issue: airbag warning lights flashing with codes such as B1001, stemming from communication breakdowns that could compromise safety systems. By swapping in this pre-programmed module, you resolve these glitches instantly, as it syncs with the supplemental restraint system without extra coding. Electrical gremlins, like non-responsive power windows, door locks, or exterior lights, frequently trace back to grounding faults or module corrosion—common in high-mileage Sierras exposed to harsh weather. Security malfunctions might cause stalling or no-start scenarios, mimicking fuel issues but really tied to immobilizer errors. Our BCM fixes this by restoring secure protocols, improving overall vehicle grounding and preventing misfires. Real-world example: A client with a 2009 Sierra 3500 towing trailers reported random light failures; post-replacement, it cleared all body function DTCs, boosting reliability for heavy loads. This isn’t just a patch—it’s a comprehensive fix that enhances system integration, reducing future shop visits and supporting better fuel efficiency through optimized electronics.
Key Features & Benefits
- VIN-Specific Programming: Arrives ready-to-install with the latest GM software matched to your Sierra’s VIN, eliminating dealership trips and instantly resolving common DTC codes for hassle-free operation.
- Robust Durability: Engineered to OEM standards, this module withstands the demands of towing and rough terrain, offering a one-year warranty for peace of mind in daily or high-performance use.
- Comprehensive Control: Manages lights, windows, locks, wipers, HVAC, and security, delivering smoother functionality and preventing electrical chain reactions that could sideline your truck.
- Interchange Flexibility: Swaps seamlessly with parts like 25844480, 25835966, 15263363, and more, making it ideal for quick repairs while improving system reliability and clearing persistent codes.
- No-Hassle Policy: Skip core charges—keep your old BCM without returns, and enjoy enhanced security features that bolster anti-theft measures for your Sierra 3500.
Easy Installation Guide
- Provide your VIN during purchase to ensure precise programming—our team handles it with GM’s latest updates.
- Locate the BCM under the steering column or dash; disconnect the battery for safety before removal.
- Swap the old unit with the new 20939137 BCM—installation usually takes under 5 minutes with basic tools.
- Reconnect the battery and test functions like lights, windows, and HVAC to confirm basics.
- For post-install relearns: If no-start occurs, perform theft relearn by cycling the key from off to on (engine off) three times, waiting 10 seconds each. Reset airbag lights via ‘Setup SDM Primary Key in BCM’ using a diagnostic scanner. Some Sierras may need brake pedal recalibration—consult your manual or a tech for vehicle-specific steps to optimize braking safety.
- Inspect grounds during install to avoid repeats; use an advanced scanner for any lingering DTC B1001 codes under the BCM menu.
Fitment Details
Compatible with:
2007 – 2011 GMC SIERRA 3500
Verify part numbers; provide VIN for confirmation. No core charge required.
Don’t let BCM woes derail your Sierra 3500’s performance—grab this pre-programmed 20939137 module today for reliable fixes that clear DTC codes and restore full control. With fast shipping and expert support from Highway71AutoParts.com, get back on the road confidently. Order now and experience the difference!