Get Your Truck Running Right Again
Is your 2004 GM truck or SUV suffering from frustrating and unpredictable issues? A faulty Powertrain Control Module (PCM) can cause everything from a check engine light that won’t go away to a vehicle that refuses to start. Don’t let a bad computer keep your reliable vehicle off the road. This professionally programmed engine computer is the definitive, hassle-free solution to restore your vehicle’s performance, reliability, and drivability.
Common Symptoms of a Failing 2004 GM PCM
If you’re experiencing any of the following problems, a failing engine computer is the likely culprit. This unit is designed to be the direct solution for these issues:
- Erratic or harsh transmission shifting
- Sudden stalling or rough idling
- Poor fuel economy
- No-start or hard-start conditions
- Check Engine Light with communication error codes (like P0601, P0606)
- Loss of power and sluggish acceleration
By replacing your old module with this correctly programmed 2004 Sierra 3500 PCM 12586242, you’re not just swapping a part; you’re restoring the core of your vehicle’s engine management system to its optimal state.
Features & Benefits
- โ Plug & Play Installation: This computer arrives fully programmed to your vehicle’s specific VIN. No expensive trips to the dealership for flashing are required.
- โ Updated GM Software: We flash each module with the latest software updates from General Motors, ensuring optimal performance and efficiency.
- โ Guaranteed Compatibility: This PCM is a direct replacement for service numbers 12586242, 19299226, 89017738, and many others, ensuring a perfect fit for your 2004 Sierra, Silverado, Tahoe, Yukon, Escalade, and more.
- โ Solves Running Issues: Engineered to correct common drivability problems, eliminate false trouble codes, and restore smooth engine operation.
- โ Peace of Mind Protection: This unit is backed by our one-year replacement warranty.
An Expert’s Note on GM Programming
As a technician, I’ve seen countless issues arise from improperly matched control modules. On these 2004 GM vehicles, the PCM (also known as the P59 controller) is the central hub. It doesn’t just manage the engine; it communicates with the transmission controller, the body control module, and the instrument cluster. Using a generic, non-programmed unit can cause a cascade of communication errors. That’s why our VIN-specific programming is so critical. We ensure that the computer we send you is an exact digital match for your truck, allowing all systems to communicate seamlessly, just as the factory intended.
Ordering a pre-programmed 2004 Sierra 3500 PCM 12586242 is the smartest way to get your truck back to work. We take care of the complex technical work so you can focus on a straightforward installation and enjoy a vehicle that runs like new. After your purchase, simply provide us with your VIN, and we’ll handle the rest.
Frequently Asked Questions
Do I need to program this computer?
No. The main benefit of our service is that we program the computer for you before it ships. It will arrive ready to install, matched to your vehicle’s VIN with the latest GM software.
Where do I provide my vehicle’s VIN?
After you complete your purchase, we will provide clear instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship your part until we receive this information.
Is any other procedure needed after I install it?
In some cases, your vehicle may require a security relearn procedure, which is a simple process that can be done without special tools and typically takes 10-15 minutes. We can provide instructions for this. Some vehicles may also require a Crankshaft Variation Relearn (CASE relearn) with a capable scan tool to turn off the check engine light, but the vehicle will run and drive without it.
How do I know if this part is compatible with my vehicle?
This PCM, part number 12586242, is compatible with a wide range of 2004 GM trucks and SUVs. It directly replaces numerous service numbers like YFKD, YFKF, YFXL, and more. Please check the detailed fitment list on this page to confirm your model and original service number.
What makes this a better option than a used part from a junkyard?
A used part from a junkyard will be programmed to the donor vehicle, not yours. This will cause a no-start condition and communication errors. Our units are tested, professionally programmed specifically for your VIN, and backed by a warranty, providing a reliable, long-term solution.