Get Your Truck Back in Action
Is your 2004 GM truck or SUV suffering from frustrating issues like a persistent check engine light, erratic shifting, poor fuel mileage, or even 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 direct-fit replacement for service number 12586242 is the definitive solution to restore the performance and dependability you rely on every day. We take the guesswork out of the repair by pre-programming the unit to your vehicle’s specific VIN, 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 unit is designed to resolve these exact problems:
- Persistent Check Engine Light (CEL)
- Diagnostic Trouble Codes (DTCs) such as P0601, P0602, P0606
- Vehicle won’t start or has difficulty starting
- Harsh or unpredictable automatic transmission shifting
- Noticeable drop in fuel economy
- Stalling or rough idling
- Failure to pass emissions testing
By replacing your old module with this professionally programmed 2004 Sierra 2500 PCM 12586242, you’re not just buying a part; you’re investing in a reliable fix that gets your vehicle running correctly again.
Features & Benefits
- โ VIN-Programmed for You: Arrives ready to install with the latest GM software updates for your specific vehicle. No dealer visit required for programming!
- โ Plug-and-Play Design: Once the simple security relearn procedure is completed, this module is ready to go, minimizing vehicle downtime.
- โ Restores Peak Performance: Corrects engine and transmission issues, restoring smooth operation, proper shift points, and optimal fuel efficiency.
- โ Broad Compatibility: A direct replacement for service numbers 12586242, 19299226, 89017738 and many more, ensuring a perfect match.
- โ Built for Durability: Each unit is rigorously inspected to ensure it meets or exceeds original equipment standards for a long service life.
- โ This unit is backed by our one-year replacement warranty.
An Expert’s Note on VIN Programming
As a technician with over 20 years on the floor, I can’t stress this enough: proper VIN programming is non-negotiable on these GM vehicles. It’s not just about engine parameters; the VIN synchronizes the PCM with the Body Control Module (BCM) and the anti-theft system (Passlock/VATS). Installing a non-programmed module from a junkyard will result in a no-start condition every time. Our service saves you the headache and the expensive trip to a dealership, delivering a part that’s truly ready for your specific truck or SUV.
Don’t let a faulty computer keep your truck off the road. This is the most efficient and reliable way to solve complex electronic issues and regain confidence in your vehicle. The right part, programmed correctly, makes all the difference. This 2004 Sierra 2500 PCM 12586242 is the key to a successful repair.
Frequently Asked Questions
Do I need to do anything after I install the computer?
Yes. While the main engine and transmission programming is complete, you will need to perform a simple security relearn procedure. This can typically be done without any special tools and involves a sequence of key cycles. Instructions are readily available online or we can help guide you. Some vehicles may also require a Crankshaft Variation Relearn (CASE Relearn), which requires a capable scan tool.
How do I provide you with my VIN?
After you complete your purchase, you can send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive this information, as the programming is specific to your vehicle.
Is this guaranteed to be the right part for my vehicle?
This PCM fits a wide range of 2004 GM trucks and SUVs. The best way to ensure a perfect match is to check the service number on your current computer. If it matches 12586242 or any of the other service numbers listed in the description, this is the correct part for you.
What does “plug and play” mean exactly?
In this context, “plug and play” means the unit requires no expensive dealer-level programming after installation. You simply plug it in, perform the security relearn, and you’re ready to drive. It eliminates the most complex step of the replacement process.
Will this fix my transmission shifting problems?
The PCM controls both the engine and the transmission. If your shifting problems are caused by faulty electronic commands from a failing computer, then yes, this part is designed to correct those issues and restore proper transmission function.