Get Your GM SUV Running Reliably Again
Is your Trailblazer, Envoy, or Rainier suffering from frustrating and unpredictable issues? A faulty Powertrain Control Module (PCM) can cause a host of problems that leave you stranded and stressed. Stop guessing and replace the faulty brain of your vehicle’s engine with this direct-fit, professionally programmed PCM. This isn’t just a replacement part; it’s a comprehensive solution designed to restore your vehicle’s performance, efficiency, and dependability right out of the box.
Common Symptoms & Your Solution
A failing PCM can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following, a faulty module is a likely culprit:
- Severe rough idling or stalling
- Complete no-start condition or intermittent starting
- Harsh or erratic automatic transmission shifting
- Check Engine Light (CEL) with communication-related Diagnostic Trouble Codes (DTCs) like U0100
- Poor fuel economy and loss of engine power
- Problems with the anti-theft or security system (Passlock issues)
This module is the definitive fix for these issues. We take a genuine OEM unit and flash it with the latest, most stable software updates directly from GM, programmed specifically to your vehicle’s unique Vehicle Identification Number (VIN). This ensures perfect communication between the engine, transmission, and all other onboard systems, delivering a seamless, plug-and-drive repair.
Features & Tangible Benefits
- ✔ VIN-Programmed for Your Vehicle: Arrives ready for installation with no need for an expensive trip to the dealership for programming.
- ✔ Latest GM Software Updates: Corrects common factory drivability issues and improves overall engine and transmission performance.
- ✔ Direct OEM Fitment: Guarantees a perfect physical match for a hassle-free installation in the original location.
- ✔ Restores Original Performance: Eliminates the frustrating symptoms of a failing computer, giving you a smooth and reliable driving experience.
- ✔ Simple Installation Process: Once you provide your VIN, we handle all the complex programming. You simply install the unit and you’re ready to go.
- ✔ Cost-Effective Repair: Avoids the high costs and wait times associated with dealership parts and service departments.
- ✔ This unit is backed by our one-year replacement warranty.
Expert Insight: The Critical Role of VIN Programming
Many owners of these GMT360 platform trucks (Trailblazer, Envoy, etc.) are tempted to grab a used PCM from a salvage yard to save money. This is almost always a mistake. These vehicles use a sophisticated anti-theft system called Passlock, which is tied directly to the PCM and the Body Control Module (BCM). A mismatched PCM will trigger this system, resulting in a no-start condition that can be incredibly difficult to diagnose and resolve without dealer-level tools. Our service completely bypasses this headache. By programming the module to your exact VIN before it ships, we ensure it’s a perfect digital handshake for your specific vehicle. You’re not just buying a part; you’re buying a guaranteed solution that works correctly the first time.
Frequently Asked Questions
Do I need to do any additional programming after installation?
No. This PCM arrives fully programmed to your VIN and is ready for installation. In most cases, the vehicle will start and run immediately. Some vehicles may require a simple security relearn procedure, which takes about 30 minutes and can be done without any special tools. Instructions are available upon request.
How do I provide my vehicle’s VIN?
After you complete your purchase, you will receive instructions on how to send us your 17-digit VIN. We cannot program and ship your module until we receive this information, so please provide it promptly to avoid delays.
Will this fix my specific Check Engine Light code?
This PCM will resolve any codes directly caused by a faulty internal computer processor or software. It is crucial to properly diagnose your vehicle first, as codes can also be triggered by faulty sensors, wiring, or other mechanical components. This part is a common solution for communication codes (U-codes) and internal processor fault codes (P06xx codes).
My original part number isn’t 12573576, but it’s on your list. Will this work?
Yes. The part numbers listed (12574976, 12577955, 12584593, etc.) are all hardware-compatible and have been superseded or used interchangeably by GM. As long as your original part number is on our fitment list, this module, once programmed to your VIN, will function correctly as a direct replacement.
Is this the correct Programmed 2003-2005 Trailblazer EXT PCM for my 4.2L engine?
Yes, this unit is specifically for the GM vehicles listed, including the 2003-2005 Trailblazer EXT and other models equipped with the 4.2L inline 6-cylinder engine. The VIN-specific programming ensures it is tailored perfectly to your vehicle’s options and calibration requirements.