Experiencing Strange Electrical Problems in Your GM Truck?
If your Silverado, Sierra, or Tahoe is suffering from a frustrating mix of electrical issues—like flickering lights, unresponsive power windows, a malfunctioning HVAC system, or random warning lights on the dash—a failing Body Control Module (BCM) is the most likely culprit. This central computer acts as the nerve center for your vehicle’s body electronics, and when it starts to fail, it can cause a cascade of confusing problems. This VIN-programmed BCM is the definitive, hassle-free solution to restore your truck’s full functionality and your peace of mind.
Common Symptoms & Your Solution
A faulty BCM can manifest in numerous ways. You might be dealing with one or more of the following headaches:
- Intermittent or non-working power windows, door locks, or interior/exterior lights.
- HVAC controls that are stuck or a blower motor that won’t turn on.
- An airbag warning light that won’t go away, often with DTC B1001.
- Security system malfunctions that may prevent the vehicle from starting.
- A host of diagnostic trouble codes related to body systems.
This pre-programmed module is engineered to be a direct replacement, correcting these issues right out of the box. By installing this unit, you’re not just replacing a part; you’re providing a permanent fix that eliminates the guesswork and gets your vehicle operating reliably again.
Features & Benefits
- ✔ Plug-and-Play Installation: We pre-program this module to your vehicle’s specific VIN number. This means no expensive trips to the dealership for coding—simply install it, and you’re ready to go.
- ✔ Restores Full Functionality: Get your power accessories, lighting, climate controls, and security systems working exactly as they did from the factory.
- ✔ Solves Annoying DTCs: This is the correct fix for a range of BCM-related trouble codes, clearing your dash of persistent warning lights and error messages.
- ✔ OEM-Standard Quality: Built to meet or exceed original equipment specifications, ensuring dependable performance and long-term durability for your work truck or family SUV.
- ✔ Guaranteed Confidence: This unit is backed by our one-year replacement warranty.
- ✔ No Core Charge: We don’t require you to send your old part back. Keep it, discard it—the choice is yours, with no hidden fees.
Expert Insight: The Critical Role of VIN Programming
From over two decades of experience, I can tell you that the single biggest point of failure for a DIY BCM replacement is improper programming. A generic, non-programmed module simply won’t communicate with your truck’s other computers, like the Engine Control Module (ECM) or the Supplemental Inflatable Restraint (SIR) system. This is why our VIN programming service is so essential. We flash the module with the latest GM software specific to your exact vehicle, ensuring all systems integrate seamlessly. This is what makes our 20939137 Silverado BCM a true plug-and-play solution, saving you from the frustration and expense of a follow-up visit to a dealer or specialized shop.
Frequently Asked Questions
What exactly does a Body Control Module do?
The BCM is a computer that manages and controls many of your vehicle’s non-engine-related electronic functions. This includes power windows, door locks, the security system, interior and exterior lighting, wipers, and the HVAC system. When it fails, these systems can behave erratically or stop working altogether.
Is this BCM truly ‘plug-and-play’?
Yes. Because we program the module to your vehicle’s VIN before shipping, it is ready for installation right out of the box. In over 95% of cases, no further steps are needed. For certain issues, like a persistent airbag light, a simple sync procedure may be required as noted in the installation tips.
Why is my airbag light still on after installing the new BCM?
This can happen if the new BCM needs to be electronically ‘introduced’ to the airbag system’s computer (SDM). A procedure called ‘Setup SDM Primary Key in BCM’ must be performed using a professional-grade scan tool. This syncs the modules and will turn off the light. This is a security feature and is a normal possibility on these vehicles.
How difficult is the installation?
The physical installation is straightforward for someone with basic mechanical skills. The BCM is typically located under the driver’s side dashboard, near the steering column. It’s held in by a few clips or bolts and has several electrical connectors. The entire process usually takes less than 15 minutes.
How do I know this 20939137 Silverado BCM is the right part for my truck?
This module is compatible with a wide range of 2007-2013 GM trucks and SUVs and interchanges with numerous part numbers. Please verify your vehicle in the fitment list on this page or match one of the interchangeable part numbers provided in the description to ensure perfect compatibility.