Restore Peak Performance to Your GM Truck or SUV
Is your 2004 GMC Envoy XUV, Chevy Trailblazer, or other compatible GM vehicle suffering from erratic behavior? Issues like a persistent check engine light, rough idling, stalling, or poor fuel economy often point to a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM is responsible for managing engine and transmission functions. When it fails, the symptoms can range from annoying to debilitating, leaving you stranded. This replacement PCM, service number 12586242, is the definitive solution to get your vehicle running reliably again.
The Brain of Your Engine, Restored
The PCM orchestrates everything from fuel injection timing and spark advance to transmission shift points and emissions control. Over time, heat, vibration, and electrical surges can damage the sensitive internal circuits, leading to a host of performance problems. Simply swapping a used computer from another vehicle won’t work, as it’s not calibrated for your specific vehicle’s options and security system. Our solution eliminates the guesswork. We flash this module with the latest official GM software updates, specifically programmed to your vehicle’s unique Vehicle Identification Number (VIN). This ensures seamless integration and factory-correct performance right out of the box.
From the Diagnostic Bay
We had a 2004 Chevy SSR come into the shop with a laundry list of complaints: intermittent stalling at red lights, hard shifting from first to second gear, and a check engine light with a code for an oxygen sensor heater circuit. The owner had already replaced both upstream O2 sensors twice with no luck. After confirming the sensor wiring was intact, we hooked up our diagnostic scanner and monitored the live data from the PCM. We noticed the voltage commands to the O2 heater were dropping out randomly. Instead of chasing more parts, we connected a test PCM. Instantly, the O2 heater voltage stabilized, the shifting smoothed out, and the stalling disappeared. It was a classic case of a failing driver circuit inside the original PCM. This highlights how a faulty module can send you down a rabbit hole of replacing perfectly good parts. A correctly diagnosed and programmed 2004 Envoy XUV PCM was the true fix.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) illuminated on your dash.
- ✔ Engine stalling or shutting off unexpectedly while driving.
- ✔ Rough or erratic idling and hesitation during acceleration.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Vehicle entering a “limp mode” with reduced power.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
- ✔ Communication errors with diagnostic scan tools.
Plug-and-Play Solution for Your 2004 Envoy XUV PCM
Don’t let a faulty engine computer keep your truck off the road. This module is a direct replacement for service number 12586242 and a wide range of other compatible service numbers. The process is simple: place your order, provide us with your VIN, and we’ll handle the complex programming. Once you receive the module, installation is straightforward. On most compatible vehicles like the Envoy, Trailblazer, and Rainier, the PCM is conveniently located in the engine bay next to the air filter box. In some cases, a simple security relearn procedure may be required after installation, a process you can typically perform yourself in minutes. Get your vehicle back to factory-spec operation with this reliable, VIN-programmed engine computer.
Frequently Asked Questions
Do I need to have this PCM programmed?
No. This PCM comes fully programmed to your vehicle’s specific VIN before it is shipped. It is ready for installation upon arrival. Please provide your VIN during or after checkout to ensure correct programming.
Where is the PCM located on my 2004 GMC Envoy XUV?
On the 2004 Envoy XUV and similar platforms like the Trailblazer EXT and Rainier, the PCM is typically found in the engine compartment, mounted next to the air filter housing.
What happens if I forget to provide my VIN?
We cannot ship the module without your vehicle’s VIN. The programming is essential for the computer to function with your engine, transmission, and security system. We will contact you to retrieve the VIN if it is not provided with the order.
Will this computer fit other part numbers?
Yes, this PCM is a direct replacement for several service numbers, including 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN. Please verify your original part number is on this list to ensure compatibility.
Is any special relearn procedure needed after installation?
In many cases, the vehicle will start and run perfectly after installation. However, some GM vehicles may require a security relearn procedure (often called a Passlock relearn) to allow the engine to start. This is a simple procedure that typically involves turning the key on for 10-15 minute intervals and does not require special tools.