Get Your Powerhouse Back on the Road
Is your 2004 Hummer H2, Sierra, or Silverado feeling less like a beast and more like a burden? When the very brain of your engine—the Powertrain Control Module (PCM)—starts to fail, it can cause a cascade of frustrating and debilitating problems. From a sudden refusal to start to erratic performance that leaves you stranded, a faulty PCM can sideline the vehicle you depend on. This isn’t just an inconvenience; it’s a loss of capability and confidence. This replacement PCM is the definitive, reliable solution to restore your truck or SUV’s performance and get you back in command.
Common Symptoms & Your Solution
If you’re experiencing any of the following issues, a failing engine computer is the likely culprit. This pre-programmed module is engineered to be the direct solution for your 2004 Hummer H2 PCM and other compatible GM vehicles, correcting problems such as:
- Complete no-start or intermittent starting issues
- Poor fuel economy and engine performance
- Harsh or unpredictable transmission shifting
- Check Engine Light (CEL) with communication-related Diagnostic Trouble Codes (DTCs) like U0100, P0601, or P0606
- Stalling for no apparent reason while driving or at idle
- Failure to pass emissions testing
Features & Benefits
- ✔ VIN-Programmed for Your Vehicle: We flash this module with the latest GM software updates using your vehicle’s specific VIN. This ensures perfect compatibility and function right out of the box, saving you a trip to the dealership.
- ✔ Restores Original Performance: Eliminate frustrating drivability issues and restore the smooth power delivery and crisp shifting you expect from your GM truck or SUV.
- ✔ Broad Compatibility: This unit is a direct replacement for a wide range of service numbers, including 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, and many more, ensuring a precise fit.
- ✔ Plug-and-Play Installation: Once programmed, this PCM is ready to be installed. In most cases, you will only need to perform a simple security relearn procedure, which can be done without special tools.
- ✔ Peace of Mind Included: This unit is backed by our one-year replacement warranty. Drive with confidence knowing your purchase is protected.
Expert Insight: Why VIN Programming is Non-Negotiable
As a technician, I’ve seen countless issues arise from installing a generic, non-programmed computer. Your vehicle isn’t just an engine and transmission; it’s a network of modules that need to speak the same language. Programming this 2004 Hummer H2 PCM with your VIN is like giving it the correct security credentials and operational dialect. It ensures the anti-theft system, ABS, instrument cluster, and other critical systems integrate seamlessly. Skipping this step is a recipe for communication errors and a vehicle that still won’t run correctly. We handle this critical process for you, so you receive a part that’s truly ready for your specific vehicle.
Frequently Asked Questions
Is this computer difficult to install?
The physical installation is straightforward for anyone with basic mechanical skills. It typically involves disconnecting the battery, unplugging the electrical connectors from the old PCM, and unbolting it from its bracket. After installing the new unit, you will need to perform a security relearn procedure (often called a VATS relearn). This procedure can usually be done at home without any special tools and instructions are readily available online.
How do I provide my VIN?
After you complete your purchase, simply 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.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the original PCM, then yes, this part will resolve the issue and allow the light to be cleared. However, if the light is on due to other failing sensors or components on the vehicle, those issues will need to be addressed separately.
How do I know if this part number is correct for my vehicle?
The best way is to check the service number on your current computer. This unit replaces service numbers 12586242, 19299226, 89017738, and many others listed in the full description. If your number matches, and your vehicle is a 2004 model listed, this is the correct part for you.
What happens if I have an issue after installation?
Your purchase is protected. This unit is backed by our one-year replacement warranty. If you encounter any problems with the module itself within that period, we are here to help you with a replacement.