Fix Your Truck’s Electrical Headaches for Good

If your 2011 GMC Sierra Denali 3500 is suffering from a baffling array of electrical issues—like the radio acting up, power locks with a mind of their own, or the A/C blower quitting unexpectedly—you’ve likely met the culprit: a failing Body Control Module (BCM). As a technician with over two decades of experience, I’ve seen these modules cause some of the most frustrating and misdiagnosed problems on GM trucks. The BCM is the central command for your vehicle’s body electronics, and when it goes, it takes convenience, comfort, and sometimes even safety features down with it.

This isn’t just a replacement part; it’s a permanent fix. We pre-program this module to your truck’s specific Vehicle Identification Number (VIN) before it ships. This means you can skip the expensive trip to the dealership and the hassle of their programming fees. It arrives ready for a true plug-and-play installation, restoring full function to your vehicle’s essential systems right out of the box.

Solving the Mystery with a 2011 Sierra Denali 3500 BCM

A faulty BCM can make you feel like you’re chasing ghosts in your truck’s wiring. One day the dome light won’t turn off, the next the security light is flashing and preventing it from starting. This module is engineered to OEM specifications to directly address these common failures, providing a stable and reliable solution that integrates seamlessly with your truck’s existing systems. Stop throwing parts at the problem and get the direct-fit, pre-programmed solution you need.

Is Your Sierra Acting Possessed? Common BCM Failure Signs

If you’re experiencing any of the following, a failing BCM is the most likely cause. Don’t let these issues sideline your workhorse truck.

• ✔ Strange electrical behavior: Wipers, lights, or radio turning on and off by themselves.
• ✔ Non-functional power accessories: Windows, door locks, and mirrors stop working intermittently or completely.
• ✔ HVAC problems: Blower motor not working or climate controls are unresponsive.
• ✔ Security system faults: A persistent anti-theft light, no-start conditions, or stalling.
• ✔ Airbag light on: Often accompanied by Diagnostic Trouble Code (DTC) B1001, indicating a communication issue between the BCM and the SDM (airbag module).
• ✔ Communication codes: A scan tool may show U-codes (e.g., U0140, U0155) indicating a loss of communication with other modules.

Your 5-Minute BCM Installation Guide

Getting your truck back to normal is easier than you think. No complex procedures or special tools are required for the physical swap.

1. Safety First: Always disconnect the negative terminal from your truck’s battery before working on any electronics.
2. Locate the BCM: On your Sierra, the Body Control Module is located under the driver’s side of the dashboard, typically to the left of the steering column. It’s a black box with several large multi-pin connectors.
3. Swap the Module: Carefully unplug the electrical connectors. They have locking tabs, so be sure to depress them fully before pulling. Remove the old BCM (it may be held by clips or small bolts) and install the new, pre-programmed module in its place.
4. Reconnect Everything: Plug the connectors firmly into the new BCM until they click. Reconnect the negative battery terminal.
5. Perform Relearns (If Needed): Start the vehicle. In most cases, you’re done! However, if the airbag light is on, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ function. A Brake Pedal Position Relearn may also be required on some models.

Verified Fitment for Your GM Truck or SUV

This module is a direct replacement for part number 22860591 and is interchangeable with many others, including 25844480, 25835966, and 20939137. It is designed for a wide range of 2007-2013 GM vehicles. Please verify your model and year from the list below:

Note: For 2007 models, this fits the ‘new body style’ with the smooth door skin. Always match your part number or contact us with your VIN to ensure 100% compatibility.