Is Your GM Truck or SUV Running Rough?
If your 2003-2007 Hummer H2, Silverado, Sierra, or another compatible GM vehicle is experiencing frustrating issues like stalling, erratic shifting, a persistent check engine light, or a no-start condition, the problem may lie with a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM is responsible for managing the engine, transmission, and dozens of other critical systems. When it fails, it can cause a cascade of problems that are often difficult to diagnose, leading to wasted time and money on unnecessary parts.
This replacement Powertrain Control Module, part number 12602802, is the definitive solution to restore your vehicle’s performance and reliability. It’s not just a part; it’s a complete, ready-to-install fix. We take the guesswork and hassle out of the process by pre-programming the module specifically for your vehicle using your VIN. This ensures that it has the latest software updates directly from GM, often correcting underlying drivability issues that were present from the factory.
From the Diagnostic Bay
We once had a 2005 Silverado 2500 with the 6.0L come into the shop with a complaint of intermittent stalling at stoplights and a harsh 1-2 shift. The owner had already replaced the throttle position sensor and the mass airflow sensor with no improvement. After hooking up our scan tool, we noticed erratic data readings from multiple sensors but no specific trouble codes pointing to a single component. This is a classic sign of a failing PCM. The internal processors were struggling, corrupting the data streams. We installed a VIN-programmed module just like this one, performed the security relearn, and the truck ran perfectly. The customer was thrilled to finally have a reliable truck again after chasing the problem for months.
Diagnosing a Faulty 2003-2007 Hummer H2 PCM
A failing PCM can manifest in numerous ways, often mimicking the symptoms of other faulty components. Before replacing your module, it’s essential to ensure the PCM is truly the culprit. Common indicators include communication errors with diagnostic scan tools, multiple unrelated trouble codes appearing simultaneously, or persistent issues even after replacing related sensors. If you’ve checked your wiring and sensors and are still at a dead end, the PCM is the most likely cause.
Symptoms of a Failing PCM
- ✔ Check Engine Light is illuminated with various communication or processor-related codes (e.g., P0601, P0606).
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Decreased fuel economy and poor engine performance.
- ✔ The vehicle will not start, but the battery and starter are functioning correctly.
- ✔ Intermittent issues that seem to worsen as the engine warms up.
- ✔ Failure to pass an emissions test due to readiness monitor issues.
A True Plug-and-Play Solution
Forget expensive trips to the dealership for programming. Our process is simple: place your order, provide us with your vehicle’s VIN, and we handle the rest. We will flash the module with the correct GM-certified calibration for your exact vehicle configuration. When you receive the part, installation is straightforward. In most cases, you will only need to perform a simple security relearn procedure (often called a Passlock or VATS relearn), which can be done without any special tools. This procedure pairs the new PCM to your vehicle’s anti-theft system. This 2003-2007 Hummer H2 PCM is also a direct replacement for a wide variety of other GM trucks and SUVs, making it a versatile and reliable choice for your repair.
This module is a direct replacement for the following service numbers: 89017750, 12582605, 12589463, 12602802, 89017734, 28042802. Please verify your part number or contact us to ensure compatibility.
Frequently Asked Questions
Do I need to have this module programmed?
No. This module comes fully programmed to your vehicle’s specific VIN. Simply provide your VIN at checkout, and we will flash the unit with the latest GM software before shipping it to you.
What do I need to do after installing the PCM?
After installation, you will need to perform a security relearn procedure to sync the new PCM with your vehicle’s anti-theft system. This procedure typically takes 30-40 minutes and can be done without special tools. Instructions are widely available online for your specific model. A Crankshaft Variation (CASE) relearn may also be needed, which requires a capable scan tool.
Where is the PCM located on my vehicle?
On most compatible GM trucks and SUVs like the Hummer H2, Silverado, and Tahoe, the PCM is located in the engine bay, on the driver’s side, under or next to the battery tray.
Is this compatible with other part numbers?
Yes, this module is a direct replacement for several service numbers, including 89017750, 12582605, 12589463, 89017734, and 28042802. It fits a wide range of GM vehicles from 2003 to 2007.
How do I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on a placard on the driver’s side dashboard visible through the windshield.