Is Your Hummer H2 or GM Truck Running Rough?
There’s nothing more frustrating than a vehicle that won’t run right. If you’re experiencing baffling issues like a persistent check engine light, erratic transmission shifting, a rough idle, or even a no-start condition, the problem often points directly to a failing Powertrain Control Module (PCM). As the brain of your vehicle, when the PCM falters, it can cause a cascade of problems that leave you stranded and stressed. This isn’t just an inconvenience; it’s a loss of the power and reliability you depend on. It’s time for a definitive solution that gets you back in command.
Common Symptoms of a Failing PCM & Your Solution
A faulty PCM can manifest in numerous ways, often mimicking other component failures. Before you start replacing sensors and parts, check if you’re experiencing any of these classic signs of PCM failure. This unit is the direct solution for these issues:
- Unexplained Check Engine Light (CEL)
- Engine stalling or misfiring
- Harsh or delayed transmission shifts
- Poor fuel economy
- Failure to pass emissions tests
- No-start or hard-start conditions
- Diagnostic Trouble Codes (DTCs) such as P0601, P0602, P0606, or U-series communication codes.
This replacement 2003-2007 Hummer H2 PCM 12602802 is the reliable, straightforward fix. We take the guesswork and complexity out of the repair by pre-programming the module specifically for your vehicle before it ever leaves our facility.
Features & Benefits
- ✔ VIN-Specific Programming: We flash the module with your vehicle’s exact VIN and the latest GM software updates. This ensures perfect compatibility and function right out of the box, eliminating the need for an expensive trip to the dealership.
- ✔ Plug-and-Play Installation: Because the programming is done for you, installation is simple. Just disconnect the battery, swap the modules, and perform a security relearn procedure (instructions available online). No special tools are required.
- ✔ Restored Performance: A properly functioning PCM restores crisp engine response, smooth transmission shifting, and optimal fuel efficiency, making your truck drive like it should.
- ✔ Broad Compatibility: This module is a direct replacement for multiple service numbers, including 89017750, 12582605, 12589463, and more, covering a wide range of popular GM trucks and SUVs.
- ✔ Purchase with Confidence: This unit is backed by our one-year replacement warranty. You can be confident that you’re making a sound investment in your vehicle’s health.
An Expert’s Note on PCM Replacement
As a technician with over 20 years on the floor, I’ve seen countless vehicle owners try to save a few dollars by pulling a computer from a salvage yard. Almost every time, it ends in frustration. GM vehicles from this era use a sophisticated anti-theft system (VATS/Passlock) that marries the PCM to the original vehicle. A used module will simply not start the engine without being reprogrammed by a dealer or a specialist. Our service completely bypasses this headache. We handle the critical programming, so you receive a part that is truly ready to be installed, saving you significant time, money, and diagnostic dead-ends.
Don’t let a faulty computer keep your capable truck sidelined. Restore its core function and your driving confidence with this professionally programmed 2003-2007 Hummer H2 PCM 12602802.
Frequently Asked Questions
Do I need to do anything after I install this PCM?
Yes. While the core engine and transmission programming is complete, you will need to perform a security relearn procedure. This process syncs the new PCM with your vehicle’s anti-theft system and keys. It typically takes about 30 minutes and can be done in your driveway with no special tools. Instructions are widely available online for your specific model.
Where do I provide my vehicle’s VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive the VIN, as each module is custom-programmed for a specific vehicle.
Is this PCM compatible with other part numbers?
Absolutely. This module is a direct replacement for several service numbers, including 89017750, 12582605, 12589463, 89017734, and 28042802. Please check the full compatibility list on this page to confirm fitment for your vehicle.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls the transmission’s shift points and line pressure. If your transmission issues are electronic in nature (not a mechanical failure), a new, properly programmed PCM is often the solution for harsh, erratic, or delayed shifting.
How do I know for sure my original PCM is bad?
Diagnosing a PCM requires ruling out other potential causes first, such as wiring, sensors, or grounds. Common indicators of a bad PCM include specific internal fault codes (like P0601), a lack of communication with a scan tool, or multiple unrelated error codes appearing at once. If other components check out, the PCM is the likely culprit.
What is the warranty on this part?
This unit is backed by our one-year replacement warranty. We stand behind the quality and programming of our modules to give you peace of mind with your repair.