Restore Peak Performance to Your 2004 GM Truck or SUV
Is your 2004 GMC Envoy XUV, Sierra, Silverado, or another GM vehicle suffering from perplexing engine issues? A faulty Powertrain Control Module (PCM), also known as an Engine Control Module (ECM), is often the hidden culprit behind poor performance, random stalling, and persistent check engine lights. This replacement PCM, service number 12586242, is the definitive solution to get your vehicle running reliably again. It arrives at your door pre-programmed with the latest GM software updates, specifically matched to your vehicle’s unique Vehicle Identification Number (VIN). This eliminates the need for expensive dealership programming, making it a straightforward, effective repair.
From the Diagnostic Bay
We once had a 2004 Sierra 1500 in the shop that was driving its owner crazy. The truck would randomly misfire and stall at red lights, but threw no consistent codes. The owner had already replaced the spark plugs, ignition coils, and even the fuel pump with no success. After hooking up our professional scan tool and monitoring live data, we noticed erratic signals coming from the PCM’s outputs to the injectors. We swapped in a VIN-programmed module like this one, performed the quick security relearn, and the truck ran perfectly. It’s a classic case where chasing symptoms can cost a fortune, while addressing the core problem—the vehicle’s brain—provides the real fix.
Is Your Vehicle Showing Signs of a Failing ECM?
- ✔ Persistent Check Engine Light (CEL) that won’t go away.
- ✔ Rough or erratic engine idling.
- ✔ Unexplained stalling or hesitation during acceleration.
- ✔ A noticeable decrease in fuel economy.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ The vehicle fails to start, even with a good battery and starter.
- ✔ Communication error codes with a diagnostic scan tool.
Guaranteed Fitment for Your 2004 Envoy XUV ECM
This module is a direct replacement for a wide range of 2004 General Motors vehicles. It is crucial to match your original service number to ensure compatibility. This unit replaces service numbers 12586242, 19299226, 89017738 and various broadcast codes including YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN. Whether you’re working on an Envoy, Rainier, SSR, Sierra, Silverado, Tahoe, Yukon, Escalade, or Hummer H2, this module is engineered to restore factory function. Upon purchase, simply provide us with your VIN, and our technicians will handle the programming, ensuring a seamless integration with your vehicle’s systems.
The VIN Programming Advantage
Ordering a pre-programmed module saves you time, money, and hassle. A generic, unprogrammed computer from a parts store or salvage yard would require a tow to a dealership or specialized shop with expensive tools. Our process is simple: we flash the module with your vehicle’s exact calibration files from GM. This ensures all engine, transmission, and emissions parameters are correct for your specific build. When the part arrives, you can install it yourself. For most vehicles, a simple security relearn procedure (often called a CASE relearn) is all that’s needed to sync the new module with your keys, a process that can typically be done in your driveway in about 30 minutes without any special tools.
Frequently Asked Questions
Do I need to have this computer programmed?
No, we handle all the programming for you before shipment. All you need to do is provide your vehicle’s VIN during or after checkout. It will arrive ready to install.
What is a security relearn procedure?
This is a simple procedure that syncs the new PCM to your vehicle’s anti-theft system. For most 2004 GM vehicles, it involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. This allows the components to recognize each other. Instructions are readily available online for your specific model.
How do I find my original part number?
Your original part number is printed on a sticker on the PCM itself. On most 2004 GM trucks and SUVs, the PCM is located in the engine bay, either next to the airbox or under the battery tray on the driver’s side.
Will this fix my specific problem?
This module will correct any issues directly caused by a failing PCM. While it solves a wide range of problems, it’s important to ensure your vehicle’s issues are not from other faulty components like sensors or wiring. Proper diagnosis is always recommended.
Is this a plug-and-play part?
Yes, because we program it to your VIN, it is a plug-and-play installation. After physically installing it, you will only need to perform the security relearn procedure for the vehicle to start and run correctly.