Restore Peak Performance to Your GM Truck or SUV
Is your 2004 GM truck or SUV plagued by a persistent check engine light, erratic shifting, poor fuel economy, or a frustrating no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the central computer of your vehicle. Don’t let a faulty module keep you off the road. This professionally programmed 2004 Sierra 1500 engine computer is the reliable, direct-fit solution to restore your vehicle’s performance and dependability.
Common Symptoms & Your Solution
A failing engine computer can cause a wide range of issues that are often misdiagnosed. If you’re experiencing any of the following, this module is the definitive fix:
- Illuminated Check Engine Light (CEL)
- Diagnostic Trouble Codes (DTCs) such as P0601, P0602, P0606
- Vehicle won’t start or stalls intermittently
- Harsh or unpredictable transmission shifting
- Noticeable decrease in fuel mileage
- Communication errors with diagnostic scan tools
This unit is a direct replacement for service number 12586242 and is programmed specifically to your vehicle’s VIN, ensuring it works correctly right out of the box.
Features & Tangible Benefits
- โ Ready for Installation: Arrives programmed to your vehicle’s specific VIN, eliminating the need for expensive dealership programming or special tools.
- โ Optimized Performance: Flashed with the latest GM-certified software updates to ensure optimal engine performance, fuel efficiency, and transmission function.
- โ Guaranteed Compatibility: A direct replacement for service numbers 12586242, 19299226, 89017738 and many others, ensuring a perfect fit and function for your truck or SUV.
- โ Solves Common Issues: The most reliable way to correct frustrating problems like harsh shifting, no-start conditions, and false sensor codes caused by a faulty original computer.
- โ Purchase with Confidence: This unit is backed by our one-year replacement warranty.
An Expert’s Note on Programming
As a technician with over two decades of experience, I can’t stress this enough: proper VIN programming is not just a convenience, it’s critical. An improperly programmed module can cause more problems than it solves, from transmission damage to anti-theft system lockouts. We handle this crucial step for you, using your VIN to load the exact factory calibration your vehicle needs. This ensures all systemsโfrom the engine and transmission to the gauges and anti-theft systemโcommunicate perfectly, just as the manufacturer intended.
By installing this pre-programmed 2004 Sierra 1500 engine computer, you are not just replacing a part; you are restoring the core of your vehicle’s operational integrity. Get your truck back to work and your SUV back on the road with confidence.
Frequently Asked Questions
What information do you need from me?
After you complete your purchase, you must provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). This is essential for us to program the module correctly for your specific vehicle configuration.
Is any additional programming required after installation?
No. This module arrives fully programmed and ready for installation. However, you will need to perform a simple security relearn procedure, also known as a CASE relearn, which can be done without any special tools. Instructions are readily available online or in your vehicle’s service manual.
How do I find my original part number?
Your original part number is printed on a sticker on the module itself. Look for the 8-digit Service Number (SERV. NO.). This unit replaces service number 12586242 and many others listed in the fitment guide.
Where is this module located on my vehicle?
On most full-size trucks and SUVs like the Sierra, Silverado, and Tahoe, the module is located in the engine bay on the driver’s side, under or near the battery. On models like the Trailblazer and Envoy, it is typically located next to the air filter box.
Will this fix my specific problem?
This module is a direct solution for issues originating from a faulty computer. While it corrects a wide array of symptoms, we always recommend a proper diagnosis by a qualified technician to confirm the PCM is the root cause of your vehicle’s problem before ordering.