Restore Full Control of Your Van’s Electronics
Are you chasing electrical gremlins in your 2008-2012 GMC Savana 3500? When your work van’s lights, power windows, or security system start acting erratically, the culprit is often a failing Body Control Module (BCM). As the central command center for your vehicle’s body electronics, a faulty BCM can cause a cascade of frustrating and hard-to-diagnose issues. This isn’t just an inconvenience; it can affect your van’s security and safety systems. We offer a reliable, direct-fit solution: a genuine GM Body Control Module, part number 25934762, delivered to your door fully programmed to your vehicle’s specific VIN.
Is Your Savana Showing These Symptoms?
- ✔ Intermittent or non-working power windows, door locks, or mirrors.
- ✔ Interior dome lights or dashboard lights staying on or not working at all.
- ✔ The security system light flashing, preventing the engine from starting.
- ✔ Horn honking unexpectedly or the alarm going off randomly.
- ✔ Diagnostic trouble codes (DTCs) related to communication errors, such as U0140, U0155, or other U-codes.
- ✔ Wipers or radio functioning erratically.
Case Study: A Tricky Diagnosis
A customer brought in his 2011 Savana 3500 work van last month with a truly bizarre problem. The radio would switch off, the dome light would flicker, and occasionally, the power locks wouldn’t respond. He’d already replaced the battery and checked the main grounds. After hooking up my scan tool, I found several communication loss codes pointing to a network issue. In my 20+ years of experience, these ghost-like symptoms on GM vans almost always lead back to the BCM. Water intrusion or simple electronic failure over time can corrupt the module. We installed one of our VIN-programmed BCMs, and within an hour, all the strange electrical issues were gone. It’s a fix that restores not just functionality, but peace of mind.
A Straightforward Guide to Installation
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the BCM: On the GMC Savana and Chevrolet Express vans, the BCM is typically located in the center dash area, often accessible by removing the lower dash panels.
- Disconnect and Remove: Carefully unplug all electrical connectors from the old BCM. Note their orientation. Then, unbolt or unclip the module from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed BCM in the same location and securely re-attach all electrical connectors. They are usually keyed to prevent incorrect installation.
- Reconnect Power: Re-attach the negative battery terminal and tighten it securely.
- Perform Final Steps: Proceed immediately to the critical post-installation procedures outlined below to ensure all systems, including safety features, are correctly initialized.
Critical Post-Installation Requirements
After installing your new 2008-2012 Savana 3500 BCM, completing the following steps with a professional-grade diagnostic tool is essential for safety and proper operation. This is not optional.
- Airbag System Reset: You must perform the ‘Setup SDM Primary Key in BCM’ procedure. This step re-establishes communication between the new BCM and the airbag system’s Sensing and Diagnostic Module (SDM), which is necessary to clear the airbag warning light.
- Brake Pedal Position Sensor Relearn: Many GM vehicles require a brake pedal position sensor recalibration after BCM replacement. This ensures the brake lights and stability control systems function correctly.
Note: If you are a DIYer without access to a bidirectional scan tool, we strongly recommend having a qualified local mechanic perform these final initialization steps for you.
Guaranteed Fitment for Your GM Vehicle
This Body Control Module is a direct replacement for part number 25934762 and is compatible with a wide range of General Motors vehicles. Please verify your original part number or consult the list below. This module fits many models including, but not limited to:
This module replaces the following part numbers: 10382479, 15093910, 15276271, 15299986, 15819552, 15828601, 15837419, 15872388, 15872421, 15880684, 15921352, 15921353, 15948438, 15948439, 20815898, 20839063, 20864767, 20864768, 20921435, 20921436, 20935349, 22860591, 25826124, 25826125, 25847588, 25847589, 25892622, 25910474, 25934762, 25934763, 95151084.
Frequently Asked Questions
Do I need to program this BCM?
No. We handle the programming for you before shipment. Simply provide your vehicle’s 17-digit VIN during or after checkout, and the module will arrive with the latest GM software, ready for installation.
Where is the BCM located on my 2010 Savana 3500?
On most 2008-2012 Savana and Express vans, the Body Control Module is located behind the dashboard, in the center stack area, usually below the radio.
What happens if I don’t do the airbag or brake relearn procedures?
Failure to perform the ‘Setup SDM Primary Key’ will result in the airbag warning light staying on, and the airbag system may not function correctly. Neglecting the brake pedal sensor relearn can cause issues with brake light operation and the vehicle’s stability control system.
Will this fix my van not starting due to the security light?
In many cases, yes. A faulty BCM is a very common cause of security system-related no-start conditions on these GM vehicles. This programmed module restores the proper communication to resolve that issue.
Is this a difficult part for a DIYer to replace?
The physical replacement is straightforward for someone with basic mechanical skills and tools. The most critical part is ensuring the post-installation electronic procedures are performed with a proper scan tool.