Get Your GM Truck or SUV Back to Peak Condition
Is your 2004 GM vehicle suffering from frustrating issues like stalling, erratic shifting, a persistent check engine light, or a complete no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the electronic brain of your engine. This isn’t just an inconvenience; it affects your vehicle’s reliability, fuel economy, and safety. Don’t let a faulty computer keep your trusted truck or SUV off the road. This direct-fit PCM is the definitive, hassle-free solution to restore the dependable performance you rely on every day.
Common Symptoms & Your Solution
A failing PCM can manifest in numerous ways, often triggering Diagnostic Trouble Codes (DTCs) such as P0601, P0602, P0606, or U0100. If you’re experiencing any of the following, this module is the fix you need:
- Unexplained Check Engine Light illumination
- Engine stalling or cutting out while driving
- Rough or unstable idling
- Noticeable decrease in fuel efficiency
- Harsh or incorrect automatic transmission shifting
- Failure to start, even with a good battery and starter
Our replacement 2004 Envoy XL PCM 12586242 arrives programmed to your vehicle’s specific Vehicle Identification Number (VIN), ensuring it works seamlessly with your existing systems right out of the box. We flash it with the latest official GM software updates, which can often resolve factory bugs and improve overall performance and efficiency.
Features & Tangible Benefits
- ✔ VIN-Programmed for Your Vehicle: Eliminates the need for expensive dealership programming. This module is ready for installation upon arrival.
- ✔ Loaded with Latest GM Updates: Your computer will have the most current software, ensuring optimal engine and transmission performance.
- ✔ Direct OEM Fitment: Designed to replace service numbers 12586242, 19299226, 89017738 and many more, guaranteeing a perfect fit and correct electronic communication.
- ✔ Restores Lost Power & Efficiency: Corrects engine parameters to bring back the smooth operation and fuel economy you expect from your vehicle.
- ✔ Cost-Effective Solution: A smart, affordable alternative to the high costs and long wait times associated with a dealership parts department.
- ✔ This unit is backed by our one-year replacement warranty.
A Technician’s Perspective: As a mechanic, I’ve seen countless owners struggle with generic or unprogrammed modules. They cause more problems than they solve. The key to a successful PCM replacement is the programming. Getting a module that’s pre-flashed to the VIN with the latest updates, like this 2004 Envoy XL PCM 12586242, is a game-changer. It turns a potentially complex electronic repair into a straightforward component swap, saving hours of diagnostic time and the cost of specialized tools or a tow to the dealer. It’s the way to do the job right the first time.
Frequently Asked Questions
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 Vehicle Identification Number (VIN). We must have your VIN to program the module before we can ship it.
Is this a simple plug-and-play installation?
Yes, for the most part. The module is programmed to your VIN, so it will plug in and start the vehicle. However, on many GM vehicles, a security relearn procedure (often called VATS) and a Crankshaft Variation Relearn (CASE relearn) must be performed with a capable scan tool after installation for optimal performance and to clear any related trouble codes. This is a standard procedure for any PCM replacement.
Will this fix my specific problem?
This PCM is the correct solution for issues directly caused by a faulty engine computer. While it resolves the most common symptoms, it’s crucial to ensure your vehicle has been properly diagnosed. This part will not fix problems related to other bad sensors or mechanical failures.
Where is this module located on my vehicle?
On most compatible models like the Envoy, Rainier, and Trailblazer, the PCM is located in the engine bay, next to the air filter box. On trucks like the Silverado, Sierra, and Suburban, it’s typically found on the driver’s side, under the battery tray.
How do I know if this is the right part number for me?
This module, part number 12586242, directly replaces a wide range of service numbers including 19299226, 89017738, YFKD, YFKF, YFKH, and many others listed in the fitment guide. As long as your vehicle is on the compatibility list, this is the correct part, and we will program it to function perfectly for your specific application using your VIN.