Restore Peak Performance to Your GM Truck or SUV
Is your 2004 GMC Envoy, Chevy Silverado, or other GM vehicle suffering from frustrating issues like a persistent Check Engine Light, poor fuel economy, erratic shifting, or a no-start condition? A failing Powertrain Control Module (PCM) is often the culprit, acting as the brain of your vehicle’s engine and transmission. This replacement PCM, service number 12586242, is the definitive solution to get your dependable truck or SUV back on the road, running with the reliability you count on. We eliminate the dealership hassle by programming the unit specifically to your vehicle’s VIN before it ships, ensuring a seamless installation process.
Common Symptoms & Your Solution
If you’re experiencing any of the following, a faulty PCM is the likely cause. This pre-programmed module is designed to resolve these exact problems:
- Check Engine Light (CEL) Illumination: Particularly for internal module error codes like P0601, P0602, or P0606.
- Engine Performance Issues: Stalling, misfiring, rough idling, or a noticeable loss of power.
- Transmission Problems: Harsh or delayed shifting, or getting stuck in one gear.
- No-Start Condition: The engine cranks but refuses to start, often due to a lack of fuel injector or ignition coil command from the PCM.
- Poor Fuel Mileage: An inefficiently running engine due to incorrect sensor readings or fuel calculations.
By installing our expertly programmed 2004 Envoy XL PCM 12586242, you’re not just replacing a part; you’re restoring your vehicle’s core operational integrity with the latest software updates from GM.
Features & Benefits
- ✔ VIN-Specific Programming: Arrives ready for installation, flashed with your vehicle’s unique VIN and the newest GM software. This critical step ensures perfect communication between all vehicle modules.
- ✔ Eliminates Dealer Visits: No need for expensive and time-consuming trips to the dealership for programming. This is a true plug-and-play solution.
- ✔ Broad Compatibility: A direct replacement for a wide range of 2004 GM trucks and SUVs, including the Silverado, Sierra, Tahoe, Suburban, Escalade, Rainier, and more.
- ✔ Restores Original Functionality: Cures common drivability problems, improves fuel efficiency, and ensures smooth transmission shifting by restoring the factory command center of your engine.
- ✔ Peace of Mind: This unit is backed by our one-year replacement warranty.
Expert Insight: The Ghost in the Machine
Over my 20 years in diagnostics, I’ve seen countless vehicle owners spend hundreds, sometimes thousands, chasing problems that weren’t there. A failing PCM can send out faulty signals, making a perfectly good transmission shift erratically or causing a fuel pump to underperform. It’s the ‘ghost in the machine.’ Before you replace expensive hard parts, always consider the vehicle’s brain. This pre-programmed 2004 Envoy XL PCM 12586242 often solves a whole cascade of issues at once, saving you time, money, and the headache of incorrect repairs.
Frequently Asked Questions
Do I need to do anything after installation?
In most cases, this is a plug-and-play installation. However, some vehicles may require a security relearn procedure (often called a CASE relearn or anti-theft relearn), which can typically be done without special tools. Instructions are widely available online for this simple process.
How do I provide my Vehicle Identification Number (VIN)?
After you complete your purchase, simply send us a message with your 17-digit VIN. We cannot program and ship your module without it. Please double-check it for accuracy to ensure a perfect match.
Is this a brand new part?
This is a high-quality, tested original equipment part that has been professionally programmed to function as new. It meets or exceeds all original factory specifications and is loaded with the latest software for your vehicle.
What if my old computer has a different service number?
No problem. This PCM, part number 12586242, is the correct, updated replacement for many older service numbers, including 19299226, 89017738, YFKD, YFKF, YFKH, and many others listed in the fitment guide. As long as your vehicle is listed, this is the right part.
How long does the programming process take?
Once we receive your VIN, programming is typically completed within one business day, after which your order will be shipped out promptly.