Is your 2008-2012 Express 3500 Van suffering from strange and unpredictable electrical problems? A failing Body Control Module (BCM) is often the culprit. The BCM acts as the central command center for your vehicle’s body electronics, managing everything from power windows and locks to the security system and interior lighting. When it fails, it can cause a cascade of issues that are frustrating to diagnose and can even prevent your vehicle from starting.
This is a direct-fit replacement Body Control Module, part number 20921435, that solves these common issues. The best part? This isn’t just a part in a box. We provide a complete, ready-to-install solution. Simply provide us with your vehicle’s VIN after purchase, and our technicians will program the module with the latest official GM software specific to your van. This critical step ensures full compatibility and functionality right out of the box, saving you a costly trip to the dealership for programming.
From the Diagnostic Bay
We had a contractor come in with his 2011 Express 3500 work van. The dome lights wouldn’t turn off, the radio would cut out randomly, and the power locks worked only intermittently. He was worried he had multiple, expensive wiring problems. After a quick scan, we identified communication faults pointing to the BCM. We installed a VIN-programmed module, and instantly, all the ghost-like electrical issues were gone. He was back on the job the same day without the hassle of a dealership visit.
Common Symptoms of a Failing BCM
- ✔ Erratic or non-functional power windows, door locks, or mirrors.
- ✔ Interior or exterior lights staying on or not turning on at all.
- ✔ The security system acting up, causing a no-start condition.
- ✔ Dashboard warning lights (like Airbag or ABS) illuminating for no reason.
- ✔ Radio, climate control, or instrument cluster malfunctions.
- ✔ False ‘door ajar’ warnings or other incorrect messages on the driver information center.
Your Direct Replacement Express 3500 Body Control Module
This module is the definitive solution for restoring your van’s electronic systems to factory-correct operation. By replacing your faulty original with this pre-programmed unit, you eliminate the guesswork and get a reliable fix. We handle the complex programming so you can focus on the straightforward installation. Plus, with our no-core-charge policy, you can keep your original part without any extra fees or hassle.
Installation and Post-Install Steps
While installation is plug-and-play, some vehicles may require simple post-installation relearn procedures. Depending on your vehicle’s specific options, you may need a capable diagnostic tool to perform these steps:
- Airbag System Sync: If the airbag warning light is on after installation, the ‘Setup SDM Primary Key in BCM’ procedure is needed to sync the systems. This is only required if the light appears.
- Brake Pedal Position Relearn: A recalibration of the brake pedal position sensor might be necessary to ensure correct brake light and traction control operation.
Disclaimer: Specific procedures can vary by vehicle. Always consult a factory service manual or a qualified technician for guidance.
This part will fit these makes and models with these options
EXPRESS 2500 VAN 10 Body Control (BCM); (center dash), 6.0L
EXPRESS 3500 VAN 08-09 Body Control (BCM); (center dash)
SAVANA 3500 VAN 10 Body Control (BCM); (center dash), 6.6L, VIN 6 (8th digit, opt LMM)
IMPALA 06-12 Body Control (BCM); (LH dash)
SAVANA 2500 VAN 10 Body Control (BCM); (center dash), 4.8L
ACADIA 07-12 Body Control (BCM); (LH dash)
MONTE CARLO 06-07 Body Control (BCM); (LH steering column)
TAHOE 10 Body Control (BCM); (under steering column), ID 25892622
TRAVERSE 09-12 Body Control (BCM); (LH dash)
EXPRESS 3500 VAN 10 Body Control (BCM); (center dash), 6.6L, VIN 6 (8th digit, opt LMM)
YUKON 10 Body Control (BCM); (under steering column), ID 25892622
SAVANA 2500 VAN 11-12 Body Control (BCM); (center dash)
YUKON XL 1500 10 Body Control (BCM); (under steering column), ID 20815898
CAPTIVA SPORT 12 Body Control (BCM); (center dash), ID 20921435
CAPTIVA SPORT 12 Body Control (BCM); (center dash), ID 22860591
DTS 06-11 Body Control (BCM); (RH center dash)
OUTLOOK 07-10 Body Control (BCM); (center dash)
SUBURBAN 1500 10 Body Control (BCM); (under steering column), ID 25892622
ESCALADE EXT 10 Body Control (BCM); (under steering column), ID 25892622
SAVANA 1500 VAN 08-12 Body Control (BCM); (center dash)
EXPRESS 2500 VAN 11-12 Body Control (BCM)
EXPRESS 1500 VAN 08-12 Body Control (BCM); (center dash)
STS 10 Body Control (BCM); center dash
SAVANA 3500 VAN 08-09 Body Control (BCM); (center dash)
TORRENT 07-09 Body Control (BCM); (center dash)
SAVANA 2500 VAN 10 Body Control (BCM); (center dash), 6.0L
TAHOE 10 Body Control (BCM); (under steering column), ID 20815898
CTS 08-13 Body Control (BCM); LH dash
CAPTIVA SPORT 12 Body Control (BCM); (center dash), ID 20921436
EXPRESS 3500 VAN 10 Body Control (BCM); (center dash), 6.0L
G8 08-09 Body Control (BCM); (center dash)
IMPALA 13 Body Control (BCM); (LH dash), ID 22820315
SUBURBAN 1500 10 Body Control (BCM); (under steering column), ID 20815898
AVALANCHE 1500 10 Body Control (BCM); (under steering column), ID 25892622
EXPRESS 2500 VAN 10 Body Control (BCM); (center dash), 4.8L
EXPRESS 2500 VAN 10 Body Control (BCM); (center dash), 6.6L, VIN 6 (8th digit, opt LMM)
YUKON 10 Body Control (BCM); (under steering column), ID 20815898
ESCALADE 10 Body Control (BCM); (under steering column), ID 25892622
LUCERNE 06-11 Body Control (BCM); (right side dash)
CTS 08 Body Control (BCM); RH dash
ESCALADE ESV 10 Body Control (BCM); (under steering column), ID 25892622
EXPRESS 3500 VAN 10 Body Control (BCM); (center dash), 4.8L
SAVANA 2500 VAN 08-09 Body Control (BCM); (center dash)
SAVANA 3500 VAN 10 Body Control (BCM); (center dash), 4.8L
SAVANA 3500 VAN 10 Body Control (BCM); (center dash), 6.0L
YUKON XL 1500 10 Body Control (BCM); (under steering column), ID 25892622
ESCALADE 10 Body Control (BCM); (under steering column), ID 20815898
SRX 07-09 Body Control (BCM); LH dash
ESCALADE ESV 10 Body Control (BCM); (under steering column), ID 20815898
EXPRESS 3500 VAN 11-12 Body Control (BCM)
HUMMER H2 08-09 Body Control (BCM); (LH firewall)
SAVANA 3500 VAN 11-12 Body Control (BCM)
VUE 08-10 Body Control (BCM); (center dash)
CAPRICE 11-13 Body Control (BCM)
ENCLAVE 08-12 Body Control (BCM); (LH dash)
EXPRESS 2500 VAN 08-09 Body Control (BCM); (center dash)
SAVANA 2500 VAN 10 Body Control (BCM); (center dash), 6.6L, VIN 6 (8th digit, opt LMM)
Frequently Asked Questions
Do I need to program this BCM?
No. We handle the programming for you before shipment. Just provide your vehicle’s VIN during or after checkout, and the module will arrive ready to install with the latest GM software for your specific vehicle.
Where is the BCM located on my 2008-2012 Express Van?
On the Express and Savana vans, the Body Control Module is typically located in the center dash area. You may need to remove some dash panels to access it.
What if my airbag light comes on after installation?
This is uncommon, but if it happens, it means the new BCM needs to be synced with the airbag system’s Supplemental Deployment Module (SDM). A professional scan tool is required to perform the ‘Setup SDM Primary Key in BCM’ procedure to resolve this.
Is a core return required for this part?
No. There is no core charge or need to return your old module. You can keep your original part.
How do I know if my BCM is the problem?
Common signs include multiple, unrelated electrical issues like faulty power locks, erratic lights, instrument cluster problems, or security system faults. A diagnostic scan by a qualified technician is the best way to confirm the BCM is the source of the issue.