Restore Full Electrical Function to Your GM Vehicle
Is your Chevrolet Express, GMC Savana, or other GM vehicle experiencing bizarre electrical problems? The Body Control Module (BCM) is the central command center for your vehicle’s body electronics, and when it fails, it can cause a wide range of frustrating issues. This replacement BCM, part number 20935349, is the definitive solution to get your vehicle’s systems working in harmony again.
The BCM manages everything from your power windows and door locks to the interior lights, security system, and instrument cluster warnings. A faulty module can leave you stranded, drain your battery, or create unsafe driving conditions. Our service eliminates the guesswork and costly dealership visits by providing a module that is professionally programmed with the latest GM software updates, specifically matched to your vehicle’s VIN.
From the Diagnostic Bay
We had a 2011 Express work van come in with the complaint of a dead battery every morning. The owner had already replaced the battery and alternator. During diagnosis, we noticed the interior dome lights would flicker randomly, even with the van turned off. This pointed directly to an internal short in the BCM. Instead of a complicated, multi-day repair at the dealer, we installed a VIN-programmed BCM. The electrical draw was gone, and the van was back in service the next day. It’s a common failure, and a pre-programmed module is the fastest, most reliable fix.
Is Your Express 1500 BCM Failing?
A failing BCM can manifest in numerous ways. Look for these common symptoms:
- ✔ Erratic or non-functional power windows, door locks, or mirrors.
- ✔ Interior or exterior lights that stay on, flicker, or won’t turn on at all.
- ✔ The security system engaging randomly or the key fob not working.
- ✔ False warning lights on the dashboard, such as “Service Airbag” or “Service StabiliTrak”.
- ✔ Intermittent no-start conditions or a parasitic battery drain.
- ✔ Wipers or radio behaving unpredictably.
A True Plug-and-Play Solution
Forget about expensive towing fees and dealership programming costs. This module is a direct-fit replacement for a wide array of GM vehicles. The critical advantage is our VIN programming service. When you provide your vehicle’s VIN during checkout, we flash the module so it’s ready for installation right out of the box. While most functions are restored immediately, some vehicles may require simple relearn procedures for systems like the airbag or brake pedal position sensor, which can often be done with a capable diagnostic tool.
Important Post-Installation Notes:
While this module is programmed for your vehicle, certain safety systems require a final handshake after installation. Please be aware of the following potential procedures:
- Airbag System Sync: If the airbag warning light is illuminated after installation, a ‘Setup SDM Primary Key in BCM’ procedure is necessary. This requires a professional-grade scan tool to sync the new BCM with the airbag system.
- Brake Pedal Position Relearn: To ensure correct brake light operation and stability control function, a brake pedal position sensor relearn may be required on some models.
This part is a confirmed fit for a wide range of GM vehicles, including the Acadia, Impala, Tahoe, Yukon, Enclave, and many more. Please verify your original part number against the extensive cross-reference list provided.
Frequently Asked Questions
What exactly does the Body Control Module do?
The BCM acts as the brain for your vehicle’s non-engine related electronics. It controls functions like power windows, locks, interior and exterior lighting, security system, wipers, and communicates with other modules in the vehicle.
How do I provide my VIN for programming?
After you complete your purchase, you will receive instructions on how to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship the module until we receive your VIN, as the programming is essential for it to work correctly.
Is this a difficult part to install?
For most models like the Express van, the BCM is located in the center dash area and is accessible with basic hand tools. The primary challenge is typically accessing the part, not the physical replacement. We always recommend consulting a service manual or a qualified technician if you are unsure.
Will this fix my specific electrical problem?
If your vehicle is exhibiting multiple symptoms from the list above, a failing BCM is the most likely cause. This module is designed to correct those common, widespread electrical faults.
Do I need to send my old BCM back?
No. There is no core charge for this part. You can keep your original module.
What if my airbag light is on after I install it?
This is a normal possibility. The new BCM needs to be electronically introduced to the vehicle’s airbag system (SDM). This requires a ‘Setup SDM Primary Key in BCM’ procedure using a professional scan tool to clear the light.