Is your 2006 HUMMER H3 suffering from erratic behavior, a persistent Check Engine Light, or a frustrating no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the electronic brain of your vehicle. A faulty PCM can disrupt everything from fuel delivery and spark timing to transmission shifting, leaving your rugged H3 feeling unreliable. This replacement PCM, part number 12606374, is the definitive solution to restore your vehicle’s factory performance and dependability.
This isn’t just a part in a box. We provide a comprehensive service that sets you up for success. When you order, you’ll provide us with your H3’s Vehicle Identification Number (VIN). Our technicians will then program the module with the latest GM-certified software specific to your vehicle’s configuration. This critical step ensures that the PCM communicates flawlessly with all other onboard systems, eliminating the need for an expensive trip to the dealership for programming. It arrives at your door ready for installation.
Common Symptoms of a Failing 2006 HUMMER H3 PCM
- ✔ Check Engine Light: The most common indicator, often with communication-related trouble codes (U-codes) or performance codes that don’t point to a specific sensor.
- ✔ Poor Engine Performance: You may experience rough idling, stalling, hesitation during acceleration, or a noticeable decrease in power.
- ✔ Reduced Fuel Economy: A failing PCM can’t efficiently manage the air-fuel mixture, leading to your H3 consuming more fuel than usual.
- ✔ Transmission Shifting Issues: The PCM controls transmission shift points. A faulty module can cause harsh shifting, delayed engagement, or getting stuck in one gear.
- ✔ No-Start Condition: In severe cases, the PCM may fail to control the fuel pump or ignition system, preventing the engine from starting at all, even if it cranks.
- ✔ Intermittent Electrical Problems: Seemingly random issues with gauges or other electronic components can sometimes be traced back to a failing main computer.
From the Diagnostic Bay
We had a 2006 H3 come into the shop that was driving the owner crazy. It would randomly stall at red lights, but then start right back up. No consistent codes were being stored, just a generic P0601 (Internal Control Module Memory Check Sum Error) that would pop up occasionally. We checked grounds, wiring, and sensors for weeks. On a hunch, we swapped in a known-good, programmed PCM. The stalling vanished immediately. The original module had an internal intermittent fault that only occurred under specific temperature and load conditions—a classic PCM failure that a simple part swap solved completely.
Replacing your PCM is a direct way to address the root cause of these complex electronic issues. This module is meticulously inspected to ensure it meets or exceeds original equipment specifications for durability and performance. By installing this pre-programmed unit, you are restoring the central command system of your H3’s powertrain, ensuring all components work in harmony as the manufacturer intended.
Why Choose Our Pre-Programmed PCM?
The key to a successful PCM replacement is the programming. Every vehicle has a unique software calibration based on its VIN, which accounts for its specific engine, transmission, and emissions equipment. Our VIN-programming service ensures this module is a true plug-and-play solution. Once installed, you will simply need to perform a security relearn procedure (often called a key relearn), which can typically be done in your driveway without any special tools. This simple procedure syncs the new PCM with your vehicle’s anti-theft system.
This PCM is a direct replacement for a wide range of original part numbers, including: 12569773, 12588650, 12589311, 12591647, 12597521, 12606374, and more. It also fits other GM vehicles from the same era, such as the Chevrolet Colorado, GMC Canyon, and Isuzu Ascender. Please verify the part number or consult the fitment list to confirm compatibility.
Frequently Asked Questions
Do I need to have this PCM programmed by a dealer?
No. We program the module to your vehicle’s specific VIN before we ship it. This means it arrives ready for installation, saving you time and the high cost of dealership programming.
What is a ‘security relearn’ and is it difficult?
A security relearn, or key relearn, syncs the new PCM with your vehicle’s anti-theft system. It’s a simple procedure you can do yourself. It typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating this sequence three times. We include instructions to guide you.
How do I provide my VIN?
After placing your order, you can send us your 17-digit VIN through the messaging system or include it in the ‘notes to seller’ section during checkout. We cannot ship the part until we receive your VIN.
Is this a new or used part?
This is a high-quality, OEM-grade replacement part that has been thoroughly inspected and prepared for service. It is programmed with the latest software updates from GM to ensure optimal performance and longevity.
Will this fix my vehicle’s problem for sure?
While this PCM will resolve issues directly caused by a faulty module, it’s crucial to ensure your vehicle has been properly diagnosed. A PCM failure can mimic other problems, such as a bad sensor or wiring issue. We recommend a professional diagnosis if you are uncertain.