End the Electrical Chaos in Your GM Vehicle
Are you chasing down electrical gremlins in your car, truck, or van? Flickering interior lights, power windows and locks with a mind of their own, a security light that won’t turn off, or a vehicle that refuses to start intermittently are all classic signs of a failing Body Control Module (BCM). As the central hub for your vehicle’s body electronics, a faulty BCM can cause a host of frustrating and unpredictable problems. Stop throwing parts at the problem and get the definitive solution.
A Technician’s Notebook: The Impala with a Ghost
I once had a 2011 Impala in my bay that was driving the owner crazy. The dash lights would flicker, the radio would cut out, and sometimes the car just wouldn’t crank. The battery was new, the alternator tested fine, and there were no obvious wiring issues. The scan tool showed a handful of communication codes (U-codes), pointing to a network problem. This is a tell-tale sign the BCM, the network’s traffic cop, is failing. We replaced it with a VIN-programmed module just like this one. The installation took less than an hour, and instantly, all the ghost-like electrical issues were gone. The customer saved hundreds compared to a dealership visit and got his car back the same day.
The Smart Solution: A Pre-Programmed BCM
Traditionally, replacing a BCM meant buying the part, then towing your vehicle to the dealership for expensive, time-consuming programming. We eliminate that step entirely. By providing us with your vehicle’s VIN during checkout, you receive a Programmed GM Body Control Module that is 100% plug-and-play. We flash the unit with the latest GM software specific to your vehicle’s options and configuration. This ensures all systems communicate correctly right out of the box, saving you time, money, and a major headache.
Common Signs of a Failing BCM
- ✔ Erratic or non-functional power windows, door locks, or mirrors.
- ✔ Interior or exterior lights that flicker, stay on, or don’t work at all.
- ✔ The security or anti-theft light stays illuminated, preventing the engine from starting.
- ✔ Inaccurate or dead gauges on the instrument cluster.
- ✔ Horn honking unexpectedly or not working when pressed.
- ✔ Communication Diagnostic Trouble Codes (DTCs), such as U0140, U0155, or U0100.
- ✔ Remote keyless entry (RKE) failure.
A Straightforward Guide to Installation
- ✔ Step 1: Safety FirstAlways disconnect the negative terminal from your vehicle’s battery and wait a few minutes before beginning work.
- ✔ Step 2: Locate the BCMThe location varies by model (see fitment list below). It’s typically found under the driver’s side dash, behind the center console, or near the steering column.
- ✔ Step 3: Disconnect and RemoveCarefully unplug the electrical connectors. Most have a locking tab that needs to be depressed. Once disconnected, unbolt or unclip the old BCM and remove it from the vehicle.
- ✔ Step 4: Install the New ModuleMount your new, pre-programmed BCM in the same location. Securely reconnect all electrical connectors, ensuring they click into place.
- ✔ Step 5: Reconnect and TestReconnect the negative battery terminal. Turn the key to the ‘On’ position and test all body functions—windows, locks, lights, wipers, and gauges—to confirm proper operation.
Post-Installation Procedures
While this module is delivered ready for installation, some GM vehicles require a ‘handshake’ between modules after replacement. Be aware of the following potential procedures:
- Airbag System Sync: If the airbag light is on after installation, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure. This syncs the new BCM with the airbag system.
- Brake Pedal Position Relearn: On certain models, a brake pedal position sensor relearn may be required to ensure brake lights and stability control function correctly.
Verified Vehicle Compatibility
This module is a direct replacement for part number 15837419 and a wide range of other interchangeable part numbers. Please confirm your vehicle is on this list. Note that location may vary.
Frequently Asked Questions
Frequently Asked Questions
What exactly does a Body Control Module (BCM) do?
The BCM is a computer that acts as the brain for your vehicle’s non-engine related functions. It controls power windows, locks, lights, wipers, the security system, and more, ensuring everything works together as it should.