Is Your Hummer H2 Running Rough, Stalling, or Refusing to Start?
As a mechanic with over two decades of experience under the hood, I’ve seen countless GM trucks and SUVs, including the mighty Hummer H2, sidelined by a failing Powertrain Control Module (PCM). The symptoms are often frustrating and can seem random: a persistent check engine light, erratic shifting, terrible fuel mileage, or a no-start condition that leaves you stranded. Your vehicle’s PCM is its brain, and when it starts to fail, the entire vehicle suffers. Don’t let a faulty computer dictate your truck’s reliability.
The Direct, Reliable Solution for Your Vehicle
This is a direct-fit replacement Powertrain Control Module, part number 12602802, for a wide range of GM vehicles. The best part? We handle the complicated part for you. Before we ship it, we will program the module with the latest GM-released software, perfectly calibrated to your vehicle’s specific Vehicle Identification Number (VIN). This ensures seamless communication between your engine, transmission, and other systems, restoring the performance and dependability you expect.
Expert Pro Tip: Check for Corrosion Before You Install
In my shop, a common cause of premature PCM failure on these H2s and Sierra/Silverado trucks is moisture and battery acid contamination. The module is located under the battery tray on the driver’s side. Before installing your new PCM, take a moment to thoroughly inspect and clean the electrical connector plugs with a dedicated contact cleaner. Also, check the old module’s case for any white, chalky residue, which is a sure sign of a past battery leak. Cleaning the area and ensuring your battery is secure can prevent future issues.
Why Choose Our Pre-Programmed 2003-2007 Hummer H2 PCM?
- โ VIN-Programmed for You: We load the latest GM software using your VIN. This isn’t a generic, one-size-fits-all part.
- โ Eliminate a Dealer Visit: No need for expensive dealership appointments for programming or security relearns. This module is prepared for installation right out of the box.
- โ Fix Common Issues: A reliable solution for check engine lights (P-codes), harsh shifting, poor engine performance, and intermittent stalling.
- โ Broad Compatibility: This module, 12602802, is the correct service replacement for several other part numbers, including 89017750, 12582605, and 12589463.
Plug-and-Play Installation: No Dealer Visit Required
You can get your truck back on the road in under an hour with basic hand tools. Just follow these simple steps:
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most compatible trucks and SUVs like the Hummer H2, the PCM is located on the driver’s side of the engine bay, underneath the battery and battery tray.
- Access the Module: You will likely need to remove the battery and the plastic battery tray to get clear access to the PCM.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Then, unbolt the old PCM from its mounting bracket.
- Install the New PCM: Bolt the new module into place, then firmly reconnect the electrical harnesses. You should hear a ‘click’ as they lock.
- Final Steps: Reinstall the battery tray and battery, then reconnect the negative battery terminal. Your vehicle is now ready to start.
After purchase, simply send us a message with your 17-digit VIN, and we’ll handle the rest. Restore your vehicle’s core operational integrity and drive with confidence again.