Get Your Truck Back on the Road, Fast.
Is your 2004 Sierra 3500 or GM truck acting up? Stalling, running rough, or refusing to start can bring your work to a grinding halt. You’re likely dealing with a failing Powertrain Control Module (PCM), the brain of your vehicle. This isn’t just an inconvenience; it’s a critical failure that costs you time and money. Stop chasing symptoms and get the definitive solution with this professionally programmed engine computer, designed to restore your truck’s reliability and performance.
Common Symptoms & Your Solution
If you’re experiencing any of the issues below, a failing PCM is the most likely culprit. This unit is the direct fix for:
- Erratic engine performance, poor idling, or stalling
- Failure to start or intermittent starting problems
- Check Engine Light with communication-related Diagnostic Trouble Codes (DTCs)
- Poor fuel economy and shifting issues
- Apparent transmission problems that aren’t mechanical
Features & Benefits
- โ Plug & Drive Installation: This unit arrives pre-programmed to your truck’s specific Vehicle Identification Number (VIN). No expensive trips to the dealer for flashing are required.
- โ Updated GM Software: We flash each computer with the latest factory software updates from GM, ensuring optimal performance, fuel efficiency, and emissions control.
- โ Guaranteed Compatibility: This is a direct replacement for service numbers 12586242, 19299226, 89017738 and many others. We verify fitment with your VIN.
- โ Restored Performance: Solves complex electrical and drivability issues, making your truck run like it was designed to.
- โ Peace of Mind: This unit is backed by our one-year replacement warranty.
Expert Insight: Why VIN Programming is Non-Negotiable
Back in the day, you could often swap computers between similar trucks. On a 2004 GM vehicle, that’s a recipe for disaster. The 2004 Sierra 3500 engine computer is the central hub that communicates with the transmission controller, anti-lock brake system, anti-theft system (Passlock/VATS), and even the instrument cluster. Our VIN-specific programming ensures all these modules recognize each other and work together seamlessly, just as they did from the factory. Skipping this step can lead to a no-start condition, limp mode, or a dashboard full of warning lights. We handle this critical step for you, so your installation is simple and successful.
Simple Ordering Process
- Confirm Your Part: Verify that your old unit has one of the compatible service numbers listed on this page.
- Place Your Order: Add this item to your cart and complete the checkout.
- Provide Your VIN: After your purchase, reply to your order confirmation email with your 17-digit VIN. We cannot ship your part without it!
- Installation: Once you receive the programmed module, simply disconnect your battery, swap the part, and reconnect the battery. You may need to perform a security relearn procedure, which is a simple process you can do yourself.
Don’t let a faulty computer keep your truck down. Order your programmed 2004 Sierra 3500 engine computer today and get back the power and reliability you depend on.
Frequently Asked Questions
How does the programming process work?
After you provide your VIN, we use specialized equipment to load the correct GM-certified software and calibration files for your specific vehicle. This ensures all factory settings, including for your engine, transmission, and options, are correct.
Will I need to do anything after I install it?
In most cases, you will need to perform a security relearn procedure (often called a VATS relearn). This process syncs the new computer with your vehicle’s anti-theft system and typically involves a sequence of key turns. It does not require any special tools and instructions are readily available online.
How can I be sure this fits my vehicle?
This PCM fits a wide range of 2004 GM trucks and SUVs. The best way to confirm is to check the service number on your current computer’s sticker. If it matches 12586242, 19299226, or any of the others listed, this is the correct part. Providing your VIN during checkout allows us to perform a final verification.
What information do you need from me?
We absolutely need your 17-digit Vehicle Identification Number (VIN) to program the computer correctly. Please send it to us immediately after placing your order to avoid shipping delays.
Is this a brand new part?
This is a high-quality, fully tested replacement part that has been meticulously inspected and prepared to meet or exceed original factory specifications. It is programmed with the latest software and ready for installation.