Is Your GM Truck or Van Acting Possessed?
If you’re dealing with a frustrating mix of electrical gremlins in your 2003-2007 GM vehicle, you’re not alone. In my 20+ years as a technician, I’ve seen hundreds of Silverado, Sierra, Express, and Savana models with symptoms that leave owners scratching their heads: flickering dash lights, power windows with a mind of their own, intermittent starting issues, or a security light that won’t turn off. More often than not, the culprit is a failing Body Control Module (BCM).
The BCM is the central hub for your vehicle’s body electronics. When it fails, it disrupts communication between essential systems, leading to unpredictable and annoying problems. Replacing it used to mean a mandatory, expensive trip to the dealership for programming. Not anymore.
The Simple, Reliable Solution: A VIN-Programmed BCM
This isn’t just a replacement part; it’s a complete solution. We take a high-quality, tested BCM and flash it with the latest official GM software, specifically matched to your vehicle’s unique VIN. This ensures all your factory options work exactly as they should, right out of the box. No dealer visit, no expensive programming fees, just a straightforward fix.
Real-World Diagnosis
“A customer’s 2005 Silverado 1500 came into my shop last month with the radio cutting out and the dome lights staying on constantly, draining his battery. He had already replaced the battery and checked fuses. A quick scan with my diagnostic tool showed multiple ‘Loss of Communication’ codes with the BCM. This is a textbook failure I’ve diagnosed on these GMT800 platforms countless times. We installed one of our VIN-programmed modules, and he was back on the road in under an hour with all issues resolved.”
Common Symptoms of a Failing GM Body Control Module:
- ✔ Erratic power door locks and windows
- ✔ Horn honking unexpectedly or not working at all
- ✔ Interior or exterior lights flickering or staying on
- ✔ “Service Security System” or other warning lights on the dash
- ✔ Radio and climate control malfunctions
- ✔ Intermittent no-start conditions where the engine cranks but won’t fire
Easy Installation & Important Final Steps
Installing your new 2003-2007 GM BCM is a manageable job for a DIYer. While the exact location varies, you’ll typically find it under the driver’s side dash in trucks or behind the center dash panel in vans.
- Safety First: Always disconnect the negative battery terminal before starting any electrical work.
- Locate the Old BCM: Find the module and carefully disconnect the wiring harnesses. They have locking tabs, so be gentle.
- Swap the Module: Unbolt the old BCM and install the new one in its place.
- Reconnect Everything: Securely plug in all wiring harnesses to the new module and reconnect your battery terminal.
CRITICAL POST-INSTALLATION REQUIREMENTS
After installation, two procedures are necessary to ensure full system functionality and safety. These require a bi-directional diagnostic tool (common in most professional repair shops).
- Airbag System Reset: The airbag light will be on. You must perform the ‘Setup SDM Primary Key in BCM’ procedure to sync the new BCM with the airbag system. This is a critical safety step.
- Brake Pedal Position Sensor Relearn: Some vehicles require a brake pedal position sensor recalibration to ensure proper brake light operation and stability control function.
If you are not equipped to perform these steps, we strongly recommend seeking assistance from a qualified local technician after you have installed the part.
Part Compatibility Information
This module is a direct replacement for the following part numbers: 15167329, 15194169, 15747545, 15136224, 15116065, 15198115, 15136876, and 10367689. Please ensure your vehicle is listed below to guarantee fitment.
SILVERADO 3500 PICKUP 03-05 Body Control (BCM); (under steering column), exc. crew cab
SILVERADO 2500 PICKUP 07 Body Control (BCM); classic style (creased door skin), (under steering column), MT, exc. Crew Cab
SAVANA 1500 VAN 03-07 Body Control (BCM); (center dash), w/o commercial tradesman package
SAVANA 2500 VAN 03-07 Body Control (BCM); (center dash), w/o commercial tradesman package
SAVANA 3500 VAN 03-07 Body Control (BCM); (center dash), w/o commercial tradesman package
EXPRESS 1500 VAN 03-07 Body Control (BCM); (center dash), w/o commercial tradesman package
EXPRESS 2500 VAN 03-07 Body Control (BCM); (center dash), w/o commercial tradesman package
EXPRESS 3500 VAN 03-07 Body Control (BCM); (center dash), w/o commercial tradesman package
SIERRA 1500 PICKUP 03-07 Body Control (BCM); classic style (creased door skin for 07), (under steering column), exc. Crew Cab
SIERRA 2500 PICKUP 03-07 Body Control (BCM); classic style (creased door skin for 07), (under steering column), exc. Crew Cab
SILVERADO 1500 PICKUP 03-07 Body Control (BCM); classic style (creased door skin for 07), (under steering column), exc. Crew Cab
SILVERADO 2500 PICKUP 03-07 Body Control (BCM); classic style (creased door skin for 07), (under steering column), exc. Crew Cab
SSR 03-06 Body Control (BCM)