Restore Full Control Over Your Truck’s Electronics
If you’re dealing with the maddening electrical gremlins that plague many GM trucks—flickering lights, a dead instrument cluster, or power windows with a mind of their own—your Body Control Module (BCM) is the likely culprit. This isn’t just an annoyance; it’s a failure of your vehicle’s central nervous system. This direct-fit BCM, part number 20939137, is the definitive solution for your 2013 Sierra Denali 2500 BCM issues. It arrives pre-programmed to your truck’s specific VIN, eliminating the need for expensive dealership visits and getting you back on the road with confidence and restored functionality.
Case Study: A Tricky Diagnosis
I recently had a 2013 Sierra 2500 in the bay that was driving the owner crazy. The radio would cut out, the dome lights wouldn’t work, and he kept getting a random ‘Service 4WD’ message, even though the 4×4 system checked out perfectly. After chasing grounds and checking wiring harnesses, we hooked up the scope. The BCM was sending erratic voltage signals across the CAN bus, disrupting communication between modules. Swapping in a VIN-programmed BCM like this one solved every single issue instantly. It’s often the root cause of multiple, seemingly unrelated electrical faults.
Is Your Sierra Showing These BCM Failure Signs?
A failing BCM can manifest in numerous ways. As the hub for all body-related electronics, its failure can cause a cascade of problems. Here’s what to look for:
- ✔ Intermittent or non-functional power windows, door locks, or mirrors.
- ✔ HVAC controls that don’t respond or a blower motor that works sporadically.
- ✔ An illuminated airbag warning light, often with a DTC like B1001 stored.
- ✔ Erratic behavior from the security system, leading to no-start or stalling conditions.
- ✔ Headlights, taillights, or interior lights that flicker, stay on, or won’t turn on at all.
- ✔ False warning messages on the driver information center (DIC).
A Straightforward Guide to BCM Replacement
One of the best parts of this solution is its simplicity. For most DIYers or professional techs, this is a quick job. No dash removal or complex wiring required.
- Safety First: Always disconnect the negative terminal from your truck’s battery before working on any electronic components.
- Locate the BCM: On your Sierra, the BCM is located under the driver’s side of the dashboard, usually to the left of the steering column. It’s a black box with several large multi-pin connectors.
- Swap the Module: Carefully unplug the electrical connectors. They have locking tabs, so be gentle. Unbolt or unclip the old BCM and remove it. Mount the new module in its place.
- Connect and Test: Securely plug all connectors into your new BCM. Reconnect the battery terminal. Start the vehicle and test all functions: lights, windows, locks, wipers, and HVAC to confirm the repair.
- Post-Install Check: In some cases, an airbag light may require a ‘Setup SDM Primary Key’ procedure with a capable scan tool. This syncs the new BCM with the airbag system. This is not always needed but is a known possibility on these GM platforms.
Verified Fitment for These GM Models
This module is a direct replacement for a wide range of trucks and SUVs. While this page focuses on the 2013 Sierra Denali 2500 BCM, it is also compatible with the following vehicles. Please verify your part number for a perfect match.
AVALANCHE 1500 08-09 Body Control (BCM); (under steering column)
AVALANCHE 1500 10 Body Control (BCM); (under steering column), ID 25835966
AVALANCHE 1500 11 Body Control (BCM)
ESCALADE 07-09 Body Control (BCM); (under steering column)
ESCALADE 10 Body Control (BCM); (under steering column), ID 25835966
ESCALADE 11 Body Control (BCM); (under steering column)
ESCALADE ESV 07-09 Body Control (BCM); (under steering column)
ESCALADE ESV 10 Body Control (BCM); (under steering column), ID 25835966
ESCALADE ESV 11 Body Control (BCM); (under steering column)
ESCALADE EXT 07-09 Body Control (BCM); (under steering column)
ESCALADE EXT 10 Body Control (BCM); (under steering column), ID 25835966
ESCALADE EXT 11 Body Control (BCM); (under steering column)
SIERRA 1500 PICKUP 07 Body Control (BCM); new style (smooth door skin), (under steering column)
SIERRA 1500 PICKUP 08 Body Control (BCM); (under steering column)
SIERRA 1500 PICKUP 09 Body Control (BCM), (under steering column)
SIERRA 1500 PICKUP 10-11 Body Control (BCM); (under steering column)
SIERRA 2500 PICKUP 07 Body Control (BCM); new style (smooth door skin), (under steering column)
SIERRA 2500 PICKUP 08-11 Body Control (BCM); (under steering column)
SIERRA 2500 PICKUP 13 Body Control (BCM); (under steering column), ID 25835966
SIERRA 3500 PICKUP 07 Body Control (BCM); new style (smooth door skin), (under steering column)
SIERRA 3500 PICKUP 08-11 Body Control (BCM); (under steering column)
SIERRA 3500 PICKUP 13 Body Control (BCM); (under steering column), ID 25835966
SIERRA DENALI 07 Body Control (BCM); new style (smooth door skin), (under steering column)
SIERRA DENALI 08-10 Body Control (BCM); (under steering column)
SIERRA DENALI 1500 11 Body Control (BCM); (under steering column)
SIERRA DENALI 2500 11 Body Control (BCM); (under steering column)
SIERRA DENALI 2500 13 Body Control (BCM); (under steering column), ID 25835966
SIERRA DENALI 3500 11 Body Control (BCM); (under steering column)
SIERRA DENALI 3500 13 Body Control (BCM); (under steering column), ID 25835966
SILVERADO 1500 PICKUP 07 Body Control (BCM); new style (smooth door skin), (under steering column)
SILVERADO 1500 PICKUP 08-11 Body Control (BCM); (under steering column)
SILVERADO 2500 PICKUP 07 Body Control (BCM); new style (smooth door skin), under steering column)
SILVERADO 2500 PICKUP 08 Body Control (BCM), (under steering column)
SILVERADO 2500 PICKUP 09-11 Body Control (BCM); (under steering column)
SILVERADO 2500 PICKUP 13 Body Control (BCM); (under steering column), ID 25835966
SILVERADO 3500 PICKUP 07 Body Control (BCM); new style (smooth door skin), (under steering column)
SILVERADO 3500 PICKUP 08 Body Control (BCM), (under steering column)
SILVERADO 3500 PICKUP 09-11 Body Control (BCM); (under steering column)
SILVERADO 3500 PICKUP 13 Body Control (BCM); (under steering column), ID 25835966
SUBURBAN 1500 07-09 Body Control (BCM); (under steering column)
SUBURBAN 1500 10 Body Control (BCM); (under steering column), ID 25835966
SUBURBAN 1500 11 Body Control (BCM); (under steering column)
SUBURBAN 2500 07-09 Body Control (BCM); (under steering column)
SUBURBAN 2500 10 Body Control (BCM), (under steering column)
SUBURBAN 2500 11 Body Control (BCM); (under steering column)
TAHOE 07 Body Control (BCM); (under steering column)
TAHOE 08 Body Control (BCM)
TAHOE 09 Body Control (BCM); (under steering column)
TAHOE 10 Body Control (BCM); (under steering column), ID 25835966
TAHOE 11 Body Control (BCM); (under steering column)
YUKON 07 Body Control (BCM); (under steering column)
YUKON 08 Body Control (BCM), (under steering column)
YUKON 09 Body Control (BCM); (under steering column)
YUKON 10 Body Control (BCM); (under steering column), ID 25835966
YUKON 11 Body Control (BCM), (under steering column)
YUKON XL 1500 07-09 Body Control (BCM), (under steering column)
YUKON XL 1500 10 Body Control (BCM); (under steering column), ID 25835966
YUKON XL 1500 11 Body Control (BCM); (under steering column)
YUKON XL 2500 07-08 Body Control (BCM), (under steering column)
YUKON XL 2500 09-11 Body Control (BCM); (under steering column)
Frequently Asked Questions
Frequently Asked Questions
Do I need to have this BCM programmed by a dealer?
No. We pre-program the module to your vehicle’s VIN before shipping. It arrives ready for installation, with no extra programming required, saving you time and money.
Why is my airbag light still on after installing the new BCM?
This can happen because the new BCM needs to be electronically ‘introduced’ to the vehicle’s Sensing and Diagnostic Module (SDM). A procedure called ‘Setup SDM Primary Key in BCM’ must be performed with a professional scan tool to clear the light.
Is there a core charge for this part?
No, there is no core charge. You are not required to send your old module back to us, which simplifies the process for you.
Will this fix my truck’s no-start problem?
It can. The BCM is tied into the vehicle’s security and anti-theft system (Passlock/Passkey). A faulty BCM can prevent the engine from starting or cause it to stall. If you’re experiencing these symptoms along with other electrical issues, the BCM is a strong possibility.
What is the warranty on this module?
This BCM is backed by our one-year warranty, giving you peace of mind that you’re installing a reliable, quality part in your truck.