Restore Peak Performance to Your GM Truck or SUV
Is your 2004 Hummer H2, Sierra, or Escalade suffering from frustrating issues like stalling, erratic shifting, a persistent check engine light, or a complete no-start condition? A failing Powertrain Control Module (PCM) is often the culprit, disrupting the critical communication between your engine and transmission. This replacement Engine Computer, service number 12586242, is the definitive solution to restore the power, reliability, and smooth operation you expect from your vehicle. We take the guesswork out of the repair by programming the unit specifically to your vehicle’s VIN, ensuring a seamless installation and immediate performance improvement.
Common Symptoms & Your Solution
If you’re experiencing any of the following, it’s a strong indicator that your PCM needs replacement. This unit is designed to resolve these exact problems:
- Check Engine Light (CEL) with communication-related Diagnostic Trouble Codes (DTCs)
- Engine stalling, stumbling, or rough idling
- Harsh or unpredictable transmission shifting
- Reduced fuel economy
- Complete no-start condition where the engine cranks but won’t fire
- Instrument cluster warning lights or messages
By installing our expertly programmed 2004 Hummer H2 PCM, you’re not just replacing a part; you’re restoring the central nervous system of your vehicle’s powertrain.
Features & Benefits
- โ VIN-Specific Programming: We flash the module with the latest GM software updates using your vehicle’s unique VIN. This ensures perfect compatibility with your factory options and anti-theft system.
- โ Plug-and-Play Design: No complex dealer tools required for installation. Once installed, you will simply need to perform the security relearn procedure, which can be done without special tools.
- โ Restored Drivability: Eliminates the root cause of poor engine performance and erratic transmission behavior for a smoother, more predictable driving experience.
- โ Broad Compatibility: A direct replacement for a wide range of 2004 GM trucks and SUVs, including Silverado, Tahoe, Yukon, Rainier, and more. Replaces service numbers 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, and others.
- โ Peace of Mind: This unit is backed by our one-year replacement warranty.
Expert Insight from a 20-Year Tech: Many people don’t realize that on these GM vehicles, the PCM is the master controller. It doesn’t just manage fuel and spark; it’s constantly talking to the transmission controller, the body controller, and the anti-theft system. That’s why just swapping a used computer from a junkyard almost never works. Our VIN-programming service isn’t a convenienceโit’s a necessity. We ensure all those digital handshakes happen correctly, so your truck runs exactly as the engineers designed it to.
Don’t let a faulty computer keep your capable truck sidelined. This professionally programmed 2004 Hummer H2 PCM is the most reliable and straightforward way to get back on the road with confidence. Simply provide your VIN after purchase, and we’ll handle the critical programming for you.
Frequently Asked Questions
How do I provide my VIN?
After you complete your purchase, you will receive an email with instructions on where to send your vehicle’s 17-digit VIN. You can also add it as a note during the checkout process. We cannot ship your part until we receive the VIN.
Is this part difficult to install?
The physical installation is straightforward for anyone with basic mechanical skills. The PCM is typically located in the engine bay, under the battery tray or next to the airbox. After installation, you will need to perform a security relearn procedure (also known as a CASE learn), which pairs the new computer to your vehicle’s keys and anti-theft system. Instructions for this procedure are readily available online and do not require a scan tool.
Will this fix my specific problem?
This 2004 Hummer H2 PCM is a direct solution for failures within the computer itself, which cause a wide range of engine and transmission issues. While it resolves the most common problems, we always recommend having a qualified technician properly diagnose your vehicle to ensure the PCM is the root cause before ordering.
How do I know if this is the right part number for my vehicle?
This unit replaces multiple service numbers, including 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN. The best way to confirm is to match one of these numbers from your original computer. Our VIN programming ensures it will function correctly even if the service number is different, as long as your vehicle is on the compatibility list.
Is any additional programming needed after installation?
No additional programming is required. Because we flash the unit with your VIN before shipping, it arrives ready for installation and the security relearn procedure. You will not need to take your vehicle to a dealership.