Get Your Truck Back to Peak Performance
Is your 2004 GM truck or SUV running rough, shifting erratically, or refusing to start? A failing Powertrain Control Module (PCM) is often the culprit, leaving you stranded and frustrated. This isn’t just an inconvenience; it’s downtime for your workhorse. This direct-fit Engine Control Module, part number 12586242, is the definitive solution to restore your vehicle’s reliability and power. We take the guesswork out of the repair by programming the unit to your vehicle’s specific VIN before it ships, ensuring a straightforward installation process.
Common Symptoms & Your Solution
If you’re experiencing any of the following issues, a faulty PCM is the likely cause. This module is the solution for:
- Persistent Check Engine Light (CEL)
- Diagnostic Trouble Codes (DTCs) like P0601, P0606, or other internal processor faults
- Rough or inconsistent idling
- Poor fuel economy
- Harsh or unpredictable transmission shifting
- Engine stalling or no-start conditions
- Communication errors with diagnostic scan tools
By replacing your old unit with this professionally programmed 2004 Sierra 2500 PCM 12586242, you’re not just swapping a part; you’re restoring the central command system of your engine and transmission for dependable operation.
Features & Benefits
- โ VIN-Programmed for Your Vehicle: We flash the module with the latest GM software updates using your VIN. This ensures compatibility and makes installation as simple as plug-and-play, often without needing a trip to the dealer.
- โ Restored Engine Efficiency: With correct data and updated software, your engine’s fuel delivery and ignition timing are optimized, helping to restore lost power and improve MPG.
- โ Smooth Transmission Function: This PCM correctly controls transmission shift points and line pressure, eliminating the harsh shifts and hesitation caused by a failing module.
- โ Direct-Fit Guarantee: This unit is a direct replacement for service numbers 12586242, 19299226, 89017738, and many others, ensuring a perfect fit in the original location without any modifications.
- โ Peace of Mind: This unit is backed by our one-year replacement warranty.
Expert Insight: The Critical Role of VIN Programming
As a technician, I’ve seen countless vehicle owners try to save a few bucks by installing a used, non-programmed computer. The result is almost always a headache. Without the correct VIN, the vehicle’s anti-theft system (Passlock/VATS) will engage, preventing the engine from starting. Even if it does start, you’ll face incorrect transmission shifting, inaccurate gauge readings, and a host of error codes because the module doesn’t recognize the vehicle’s specific options. Our pre-programming service eliminates these issues entirely, saving you time, money, and the frustration of a job that has to be done twice.
This module is the correct fit for a wide range of 2004 GM vehicles, including the Sierra 1500/2500/3500, Silverado, Tahoe, Suburban, Yukon, Escalade, Avalanche, Hummer H2, and more. Verify your service number against our list to confirm compatibility. Getting the right 2004 Sierra 2500 PCM 12586242 is the first step to a reliable repair.
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM), also known as the Engine Control Module (ECM), is your vehicle’s main computer. It controls all essential engine and transmission functions, including fuel injection, spark timing, and gear shifting, to ensure optimal performance, efficiency, and emissions.
How do I provide my VIN for programming?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship your part until we receive this information, as the programming is a critical step in the process.
Will I need to do any additional programming after installation?
In most cases, no additional programming is required. Because we program the PCM to your VIN, it is ready for installation. However, some vehicles may require a simple security relearn procedure, which can be done without special tools and typically takes 10-15 minutes. Instructions can be provided upon request.
My original part has a different service number. Will this still work?
Yes, as long as your original service number is on our compatibility list (e.g., YFKD, YFKH, YFXL, etc.), this module is the correct hardware. GM uses many different service numbers for the same computer. We program it to function identically to your original.
Where is this PCM located on my vehicle?
On most 2004 GM trucks and full-size SUVs (like the Sierra, Silverado, and Tahoe), the PCM is located in the engine bay on the driver’s side, under the battery tray. On mid-size SUVs (like the Trailblazer and Envoy), it is typically located next to the air filter box.