Are you dealing with baffling electrical issues in your 2002 GM truck or SUV? Problems like power windows that won’t budge, door locks with a mind of their own, or a security light that stays on can be incredibly frustrating. These aren’t random glitches; they’re classic signs of a failing Body Control Module (BCM). The BCM is the central command for your vehicle’s body electronics, and when it fails, it can make your truck feel possessed. This replacement Body Control Module, part number 15081857, is the definitive solution to restore order and functionality.
We take the guesswork and dealer expense out of the equation. Before this module ships, we program it with the latest GM software specifically matched to your vehicle’s VIN. This means it arrives ready for installation, saving you from costly programming fees and diagnostic headaches. Get your truck’s essential features working reliably again.
From the Diagnostic Bay: The 2002 Tahoe with a Ghost
I remember a 2002 Tahoe that came into my shop a few years back. The owner was at his wit’s end. One day the radio wouldn’t turn off even with the key out, the next the power locks wouldn’t work, and the security light was always on, causing intermittent no-start conditions. He’d replaced the battery and checked fuses, but the gremlins persisted. After hooking up my scan tool, I saw a slew of ‘loss of communication’ codes (U-codes) pointing to the BCM. Instead of a costly trip to the dealer for a new module and programming, we ordered a VIN-programmed unit like this one. The installation took less than 30 minutes, and it immediately solved every single issue. The customer was thrilled to have his reliable truck back without a massive repair bill.
Is Your Truck Showing These Symptoms?
A failing BCM can cause a wide range of problems. If you’re experiencing any of the following, this module is likely the solution you need:
- ✔ Inoperative or erratic power windows, door locks, or mirrors.
- ✔ Interior or exterior lights not working correctly (e.g., dome light stays on, headlights flicker).
- ✔ The security or anti-theft light is illuminated on the dash, possibly causing a no-start condition.
- ✔ Gauges on the instrument cluster behaving erratically or not working at all.
- ✔ Diagnostic trouble codes (DTCs) related to communication errors, such as U0140, U0155, or U0164.
- ✔ The radio or climate control system functions intermittently or not at all.
A Straightforward Guide to Installation
Replacing the BCM is a manageable job for a DIYer with basic tools. It’s typically located under the driver’s side of the dashboard.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the BCM: On most of these GM models, the BCM is mounted to a bracket under the steering column. You may need to remove a lower dash panel for access.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old BCM. They have locking tabs that need to be depressed. Once disconnected, unbolt or unclip the module from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed BCM in the same location and securely plug in all the electrical connectors. You’ll hear a click as they lock into place.
- Reconnect and Test: Reinstall any panels you removed and reconnect the negative battery terminal. Turn the key to the ‘On’ position and test all functions—windows, locks, lights, and radio—to confirm the repair.
Important Post-Installation Information
While this module is programmed for your VIN, some vehicle systems may require a ‘handshake’ with the new BCM. Please be aware of the following potential procedures:
- Airbag System Sync: If your airbag warning 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: In some cases, a brake pedal position sensor relearn may be required to ensure proper brake light and traction control operation.
Disclaimer: Always consult a factory service manual or a qualified technician if you are unsure about any step. No core charge is required; you can keep your old part.
Verified Vehicle Compatibility
This Body Control Module is a direct-fit replacement for the following 2002 GM trucks and SUVs. It is compatible with service numbers 15063577, 15081857, 19208544, 15095335, DKAJ, and DPNW.
- 2002 Cadillac Escalade (Body Control, under steering column, 4×4)
- 2002 Cadillac Escalade EXT (Body Control, under steering column)
- 2002 Chevrolet Avalanche 1500 (Body Control, under steering column, 4×4)
- 2002 Chevrolet Suburban 1500 (Body Control, under steering column, 4×4)
- 2002 Chevrolet Tahoe (Body Control, under steering column, 4×4)
- 2002 GMC Yukon (Body Control, under steering column, 4×4)
- 2002 GMC Yukon XL 1500 (Body Control, under steering column, 4×4)
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We will then program the module with the latest GM software specific to your vehicle before shipping.
Is this a plug-and-play part?
Yes, for most functions. Because we pre-program it to your VIN, it eliminates the need for dealer programming. However, as noted, some vehicles may require an additional relearn procedure for the airbag or brake systems if a warning light appears.
What is a 2002 Escalade EXT BCM?
The BCM, or Body Control Module, is a computer that manages your vehicle’s non-engine-related electronics. This includes power windows, locks, security system, interior lighting, wipers, and more. A faulty one causes these systems to fail.
Do I need to return my old BCM?
No. There is no core charge for this part. You can keep your original module, saving you the time and expense of a core return.
Will this fix my ‘Service 4WD’ light?
While the BCM communicates with many systems, a ‘Service 4WD’ message is more often related to the Transfer Case Control Module (TCCM), encoder motor, or dash switch. It’s best to get a proper diagnosis before replacing the BCM for that specific issue.