Get Your Sierra Back on the Job, Fast.
There’s nothing more frustrating than a truck that won’t run right. Whether you’re dealing with a persistent check engine light, erratic shifting, or a complete no-start situation, a failing Powertrain Control Module (PCM) can bring your work to a dead stop. This isn’t just an inconvenience; it’s lost time and money. This direct-fit Engine Control Module is the reliable, straightforward solution to restore your truck’s performance and get you back on the road with confidence.
Common Failure Symptoms & Your Direct-Fit Solution
If your 2004 GMC Sierra 2500 is experiencing any of the following issues, a faulty PCM is the most likely culprit. This pre-programmed unit is designed to be the definitive fix for these common and frustrating problems:
- Engine stalling or rough idling
- Harsh or unpredictable automatic transmission shifting
- Failure to start or intermittent starting problems
- Numerous, unrelated diagnostic trouble codes (DTCs)
- Communication errors with diagnostic scan tools
- Reduced fuel economy and poor engine performance
By installing our expertly programmed 2004 GMC Sierra 2500 PCM, you’re not just replacing a part; you’re restoring the core of your vehicle’s operational command center, ensuring all systems work in harmony as the factory intended.
Features & Benefits
- โ Plug & Drive Installation: We flash the module with the latest GM software updates using your vehicle’s VIN. This means no expensive trips to the dealership for programmingโit’s ready to install right out of the box.
- โ Restored Engine & Transmission Performance: Corrects common issues like poor fuel mixture, incorrect shift points, and rough idling, bringing back the smooth, reliable power you depend on.
- โ Guaranteed Compatibility: This unit is a direct replacement for service number 12586242 and a wide range of other compatible service numbers, ensuring a perfect match for your vehicle’s electronics.
- โ Built for Durability: Sourced to meet or exceed original equipment specifications, this module is built to handle the demanding conditions your truck operates in every day.
- โ Peace of Mind Included: This unit is backed by our one-year replacement warranty.
Expert Tip: Why VIN Programming is Non-Negotiable
On these 2004 GM trucks and SUVs, the PCM is the brain of the operation, and it’s electronically tied to your specific vehicle through the VIN. This is a critical part of the vehicle’s anti-theft system (VATS/Passlock). Simply grabbing a used computer from a salvage yard won’t workโthe truck will not start. Our professional VIN-flashing service ensures the PCM we send you is a perfect digital handshake for your truck, saving you from the headache and expense of a non-functional part and a tow to the dealer.
Frequently Asked Questions
Do I need to do any programming myself?
No. This 2004 GMC Sierra 2500 PCM arrives fully programmed to your vehicle’s specific VIN. The only step you may need to perform is a simple security relearn procedure, which involves cycling the key in the ignition and takes about 30 minutes. We include instructions for this easy process.
How do I provide my VIN number?
After you complete your purchase, you can add your VIN to the ‘notes’ section of your order. If you forget, we will contact you via email to request it before we program and ship your module.
How can I be sure this is the right part for my vehicle?
The best way to confirm is to check the service number on your original PCM. This unit replaces part number 12586242 and the other service numbers listed in the fitment data. If your number matches, this is the correct part for you.
What if my original part number isn’t on the list?
Please contact us with your vehicle’s VIN and the service number from your original module. Our team of experts can verify compatibility or help you find the correct part for your specific application.
Where is the PCM located on my 2004 Sierra?
On most 2004 GM full-size trucks and SUVs like the Sierra, Silverado, and Tahoe, the PCM is located in the engine bay on the driver’s side, under the battery tray or near the fender well.