Is your GM van or SUV plagued by mysterious electrical problems?
If you’re dealing with flickering lights, malfunctioning power windows or locks, a security system that acts up, or warning lights that won’t turn off, a failing Body Control Module (BCM) is likely the culprit. The BCM is the central computer for your vehicle’s body electronics, and when it fails, it can cause a wide range of frustrating and seemingly unrelated issues. This replacement Body Control Module, part number 20921435, is the definitive solution to restore full functionality and reliability to your vehicle.
From the Diagnostic Bay
We had a 2011 Savana work van come in that was a complete electrical nightmare. The driver reported the dome lights would stay on, draining the battery overnight, and the power door locks worked intermittently. After checking the basics, we hooked up our scanner and found multiple communication codes pointing to the BCM. Instead of a costly and time-consuming trip to the dealer, we installed one of our pre-programmed modules. The van was back on the road the same afternoon with all issues resolved, saving the owner significant downtime and expense.
Symptoms of a Failing Body Control Module
- ✔ Erratic or non-functional interior and exterior lights.
- ✔ Power windows, mirrors, or door locks not working correctly.
- ✔ Intermittent issues with the radio or instrument cluster gauges.
- ✔ Vehicle security system faults or alarm sounding unexpectedly.
- ✔ A/C and climate control system malfunctions.
- ✔ Key fob not responding or remote start failure.
- ✔ Diagnostic trouble codes (DTCs) related to BCM communication.
Pre-Programmed for Your 2008-2012 Savana BCM
Don’t waste time and money at the dealership. We take the hassle out of the repair by programming this module specifically for your vehicle before it ships. Simply provide us with your vehicle’s VIN during checkout, and our technicians will flash the unit with the latest GM software updates. This ensures it communicates perfectly with your vehicle’s other systems right out of the box. This is a true plug-and-play solution for your 2008-2012 Savana BCM, getting you back on the road faster.
Installation and Post-Install Notes
While installation is straightforward for many DIYers, some vehicles may require additional steps after the new BCM is connected. Please be aware of the following potential procedures:
- Airbag System Sync: If the airbag warning light is on after installation, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure to sync the modules.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor relearn may be necessary to ensure correct brake light and traction control operation.
Always consult a factory service manual or a qualified technician for vehicle-specific instructions.
Frequently Asked Questions
What does the Body Control Module (BCM) do?
The BCM acts as the central hub for your vehicle’s body electronics. It controls non-engine related functions like power windows, locks, lights, wipers, security system, and climate controls.
How do I know this part will fit my vehicle?
This module replaces a wide range of original GM part numbers. Please check the list of compatible part numbers on this page and match it to the number on your original BCM to ensure a perfect fit.
What information do you need to program the module?
We require your vehicle’s 17-digit Vehicle Identification Number (VIN) to program the BCM with the correct software and vehicle-specific options. Please provide your VIN at checkout.
Is this BCM difficult to install?
The physical installation is typically simple, involving disconnecting the battery and swapping the module. However, as noted, some vehicles may require a post-installation relearn procedure with a diagnostic tool for systems like the airbags.
Do I need to send my old BCM back?
No, there is no core charge for this part. You can keep your original module.