Fix Annoying Electrical Problems in Your GM Van or Truck
If you’re a professional mechanic or a fleet owner, you know that a 2004-2007 GMC Savana 2500 is a workhorse. But when its Body Control Module (BCM) starts to fail, it can bring your operations to a halt with a host of baffling electrical issues. This isn’t just an inconvenience; it’s a reliability problem. This OEM-quality replacement BCM, part number 15136225, is the definitive solution. As the central nervous system for your vehicle’s body electronics, it manages everything from the dome lights and power locks to the HVAC system and security features. We pre-program this module to your vehicle’s specific VIN, ensuring it works right out of the box without a trip to the dealer for expensive programming.
Is Your Savana Van Showing These Electrical Gremlins?
A failing BCM can manifest in numerous ways. Over my 20+ years in diagnostics, I’ve seen these modules cause some of the most frustrating symptoms to track down. Here are the most common signs that your BCM is the culprit:
- ✔ The instrument cluster lights flicker, or gauges behave erratically.
- ✔ Power windows, door locks, or mirrors work intermittently or not at all.
- ✔ Your HVAC blower motor is stuck on one speed, or the climate controls are unresponsive.
- ✔ The anti-theft system acts up, causing a no-start condition where the engine cranks but won’t fire.
- ✔ An airbag warning light is illuminated on the dash, often with a B1001 diagnostic trouble code.
- ✔ Headlights, taillights, or interior lights stay on, draining your battery.
Real-World Repair Story
A local contractor brought in his 2006 Savana 2500 work van last month. The complaint was a dead battery every morning. He’d already replaced the battery and alternator, but the problem persisted. A parasitic draw test pointed to a significant drain. After isolating circuits, we traced it to the BCM, which was keeping the interior lighting relay energized even when the van was off. Swapping in a VIN-programmed 2004-2007 Savana 2500 BCM like this one solved the problem instantly. It’s a classic failure mode for these hardworking vehicles, and this part is the go-to fix in my shop.
A Straightforward Guide to BCM Installation
For the savvy DIYer or professional tech, replacing the BCM is a quick job. In most Savana and Express vans, you’ll find it behind the center dash panel. The entire process shouldn’t take more than 15-20 minutes.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work. This prevents short circuits and helps reset the vehicle’s electronic systems.
- Locate the Module: On Savana/Express vans, the BCM is typically located in the center dash area, often accessible by removing a lower trim panel. On pickups and SUVs, it’s usually under the driver’s side of the dashboard, near the steering column.
- Swap the Part: Carefully unplug the electrical connectors from the old BCM. They have locking tabs, so be gentle. Remove any mounting screws or clips holding the old module in place, then install the new one and reconnect the wiring harnesses.
- Reconnect and Test: Reconnect the battery terminal. Start the vehicle and test all body functions: lights, locks, windows, wipers, and HVAC to confirm the repair was successful.
- Post-Installation Checks: For some vehicles, you may need a diagnostic scan tool to perform a ‘Setup SDM Primary Key in BCM’ procedure to clear an airbag light. A brake pedal position sensor recalibration may also be required. Consult a service manual for vehicle-specific procedures if these issues arise.
Verified Vehicle Compatibility
This module is a direct replacement for part number 15136225 and other interchangeable numbers. It is designed to fit a wide range of GM vehicles. Please verify your specific model and options below. This part is a common fit for the 2004-2007 Savana 2500 BCM with the commercial tradesman package (RPO code PRP).
EXPRESS 2500 VAN 04-07 Body Control (BCM); (center dash), w/commercial tradesman package (opt PRP)
AVALANCHE 1500/2500 03-06 Body Control (BCM); (under steering column)
SILVERADO 1500/2500/3500 03-06 Body Control (BCM); (under steering column), Crew Cab
SIERRA 1500/2500/3500 03-06 Body Control (BCM); (under steering column), Crew Cab
SILVERADO/SIERRA CLASSIC 07 Body Control (BCM); (under steering column), Crew Cab
TAHOE/YUKON/SUBURBAN/YUKON XL 03-06 Body Control (BCM); (under steering column)
ESCALADE/ESV/EXT 03-06 Body Control (BCM); (under steering column)
HUMMER H2 04-07 Body Control (BCM); (LH dash)
…and other models as listed in the full compatibility chart.
Frequently Asked Questions
What does a Body Control Module (BCM) do?
The BCM is a computer in your vehicle that controls and monitors most of the non-engine related electronic accessories. This includes your power windows, locks, interior and exterior lighting, wipers, security system, and climate controls.
Is this part difficult to install myself?
For someone with basic mechanical skills, this is a very straightforward installation. It typically involves removing a trim panel and a few connectors. Since we pre-program it to your VIN, there is no complex computer work required, making it a great DIY-friendly repair.
Will this VIN-programmed BCM require a trip to the dealership?
No. The primary reason for a dealer visit is for programming. We handle that for you by programming the module with your vehicle’s VIN before shipping. It arrives ready to install, saving you time and money.
Will this fix my airbag light?
A faulty BCM is a common cause of an airbag light with DTC B1001. Replacing the BCM will likely solve the root cause, but you may need to use a professional scan tool to perform the ‘Setup SDM Primary Key in BCM’ function to clear the light after installation.
Do I need to send my old BCM back?
No, there is no core charge for this part. You can keep or dispose of your old module without any hassle.
What does ‘Commercial Tradesman Package (opt PRP)’ mean for my Savana?
This refers to a specific equipment package (RPO code PRP) offered by GM on their work vans. This BCM is the correct version for vans equipped with that package. Providing your VIN ensures we send the exact correct part for all your vehicle’s options.