2003 – 2005 – BCM (BCM) 15122670 – Pre-Programmed to Your VIN with One-Year Warranty from Highway71AutoParts.com
Ever dealt with erratic power windows or dashboard lights flickering unpredictably in your 2003-2005 Chevy Trailblazer or GMC Envoy? What if your doors refuse to lock properly, or the interior lights stay on, draining the battery overnight? These frustrating symptoms often point to a failing Body Control Module (BCM), the central hub managing your vehicle’s electrical systems. As a seasoned mechanic who’s diagnosed countless GM SUVs from this era, I’ve seen how a faulty BCM can turn a reliable ride into a headache. Our pre-programmed BCM, part number 15122670 (also compatible with 15065293, 15114669, 15191621, 9352135), arrives flashed with the latest GM updates using your VIN for a seamless fit. This eliminates guesswork, restoring smooth operation without dealership hassles. Compatible models include 2002-2005 Chevy Trailblazer, GMC Envoy, Oldsmobile Bravada, Isuzu Ascender, Buick Rainier, and Saab 9-7X—specifically those without security systems, mounted front near the fuse box or rear floor panel. Dive deeper, and you’ll appreciate how this fix not only resolves immediate issues but prevents cascading electrical failures, saving you time and money in the long run.
Key Features & Benefits
- Arrives fully programmed to your exact VIN, ensuring plug-and-play compatibility and eliminating programming fees at the shop.
- Incorporates the newest GM software updates for enhanced reliability, addressing known glitches in 2003-2005 GM SUV electrical controls.
- Backed by a one-year warranty, giving you peace of mind against defects—I’ve installed these in dozens of Envoys, and they hold up under daily driving demands.
- No core charge means you keep your old part without extra costs, perfect for DIYers troubleshooting BCM problems in older Trailblazers.
- Supports multiple part numbers for broad fitment, ideal for fleet owners maintaining mixed GM models from 2002-2005.
- Expertly tested to GM standards, reducing risks of intermittent failures that plague aging body control modules in humid climates.
Common Issues & How This Fixes Them
In my two decades fixing GM vehicles, BCM failures in 2003-2005 models like the Envoy or Trailblazer often stem from moisture ingress or voltage spikes, leading to corrupted internal circuits. One common headache is malfunctioning power accessories—think windows that won’t roll up or locks that engage randomly. This happens when the BCM loses communication with relays, causing erratic behavior and even safety concerns during drives. Another issue: persistent battery drain from lights that won’t shut off, often traced to faulty BCM logic gates. I’ve encountered this in Ascenders where owners reported dead batteries after short trips; replacing the module restored normal function by recalibrating the system’s power management. Dashboard warning lights, especially for airbags, can illuminate falsely due to BCM data mismatches, potentially failing inspections. Our pre-programmed unit fixes this by syncing perfectly with your VIN, clearing errors without additional scans. For voice search users asking “how to fix no-start in 2004 GMC Envoy after BCM swap,” note that theft relearn is rarely needed unless cranking issues arise—simply cycle the key on for 10 minutes, off for 30 seconds, repeat three times. And don’t overlook brake pedal recalibration in some setups to maintain ABS integrity. These insights go beyond basic swaps, helping you avoid repeat visits to the mechanic.
Easy Installation Guide
- Provide your VIN after purchase so we can program the BCM with the latest GM updates tailored to your vehicle.
- Disconnect the battery to ensure safety and prevent electrical shorts during the swap—always a smart move for GM electronics.
- Locate the BCM near the front fuse box or rear floor panel (varies by model like Envoy XUV); remove mounting bolts and unplug connectors carefully.
- Install the new BCM in the same position, reconnecting all harnesses securely to avoid loose connections that could trigger codes.
- Reconnect the battery and perform any necessary relearns: If no-start occurs, do a theft deterrent relearn by turning the key to ON for 10 minutes, off for 30 seconds, repeating three times until the security light extinguishes.
- Reset the airbag warning light via the ‘Setup SDM Primary Key in BCM’ procedure with a diagnostic tool; also recalibrate the brake pedal if your model requires it for optimal safety—consult your manual or a pro if unsure.
Fitment Details
Compatible with:
2003 – 2005 –
Verify part numbers; provide VIN for confirmation. No core charge required.
Restore your GM SUV’s reliability today with this VIN-programmed BCM—don’t let electrical gremlins sideline your daily driver. Order now from Highway71AutoParts.com and get back on the road confidently, backed by expert support and a solid warranty.