Restore Command and Performance to Your Hummer H2
Your 2004 Hummer H2 isn’t just an SUV; it’s a statement of capability and presence. When the Powertrain Control Module (PCM) โ the brain of your engine โ begins to fail, it compromises everything that makes your H2 exceptional. Don’t settle for erratic performance or a persistent check engine light. This fully programmed PCM is the definitive, hassle-free solution to restore the power, reliability, and smooth operation you demand from your vehicle.
Common Symptoms & Your Solution
A failing PCM can cause a wide range of frustrating issues. If you’re experiencing any of the following, this pre-programmed engine computer is the fix you need:
- Persistent Check Engine Light (CEL)
- Diagnostic Trouble Codes (DTCs) like P0601, P0602, P0605, or other communication errors
- Rough or unstable idling
- Unexpected stalling or difficulty starting
- Poor fuel economy
- Hesitation or stumbling during acceleration
- Erratic automatic transmission shifting
This unit is a direct replacement for service number 12586242 and arrives at your door programmed to your H2’s specific Vehicle Identification Number (VIN). This critical step ensures seamless communication with all of your vehicle’s modules, eliminating the need for an expensive trip to the dealership for programming.
Features & Benefits
- โ Plug-and-Play Installation: Arrives ready to install with no additional programming required. Simply disconnect the battery, swap the module, and reconnect.
- โ VIN-Matched Precision Programming: We flash this computer with the latest GM-approved software updates using your vehicle’s VIN, guaranteeing perfect compatibility.
- โ Restored Engine Performance: Resolves common running issues, improves fuel efficiency, and ensures smooth transmission shifting by restoring correct engine parameters.
- โ Guaranteed Fitment: A direct replacement for service numbers 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN.
- โ Purchase with Confidence: This unit is backed by our one-year replacement warranty.
Expert Insight: The Importance of Correct Software
On a complex vehicle like the 2004 Hummer H2, the PCM does more than just manage the engine. It communicates with the transmission controller, the ABS module, and the body control module to ensure everything works in harmony. Using a generic, non-programmed computer can lead to a cascade of new problems. By flashing this unit with the latest GM software matched to your VIN, we ensure all systems integrate correctly, just as the factory intended. This is the key to a lasting, reliable repair for your 2004 Hummer H2 PCM 12586242.
Wide-Ranging GM Compatibility
While this is the perfect solution for your 2004 Hummer H2 PCM 12586242, this versatile module also fits a vast array of other 2004 GM trucks and SUVs equipped with 5.3L and 6.0L engines. It is a compatible replacement for vehicles such as the Chevrolet Silverado, Tahoe, Suburban, SSR, Trailblazer EXT; GMC Sierra, Yukon; Cadillac Escalade; Buick Rainier; and Isuzu Ascender that require one of the listed service numbers.
Frequently Asked Questions
Do I need to do any programming or flashing myself?
Absolutely not. This PCM is sold as a plug-and-play solution. We handle all the programming before it ships. All you need to do is provide us with your vehicle’s VIN during or after checkout.
How do I provide my VIN?
You can add your 17-digit VIN in the notes section during checkout. If you forget, don’t worry! We will contact you via email to retrieve it before we program and ship your part.
Is this the correct part for my truck?
This unit is the correct replacement if the service number on your original computer matches 12586242 or any of the other compatible service numbers listed in the description (e.g., 19299226, 89017738, YFKD, YFKF, etc.).
What tools are needed for installation?
Installation typically requires only basic hand tools, such as a socket set and ratchet to disconnect the battery and remove the mounting brackets for the PCM. Always disconnect the negative battery terminal before starting any work.
Will this fix my specific check engine light codes?
This PCM is a direct solution for internal module failure codes, such as P0601 (Internal Control Module Memory Check Sum Error). If your vehicle’s issues are caused by a faulty computer, this part will resolve them. However, you should always ensure other components like sensors and wiring are in good condition.