Is Your Hummer H2 or GM Truck Running Rough?
If you’re dealing with a frustrating check engine light, erratic shifting, a no-start condition, or poor fuel economy in your 2003-2007 GM truck or SUV, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer for your engine and transmission, when the PCM starts to fail, it can cause a cascade of baffling problems. I’ve seen it hundreds of times in my shop: a beautiful Hummer H2 or a workhorse Silverado that suddenly runs like it’s lost its mind. The good news is, the fix is simpler and more affordable than you think.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take a high-quality, tested PCM and flash it with the latest official GM software, specifically calibrated to your vehicle’s unique Vehicle Identification Number (VIN). This critical step ensures that once you receive the module, it communicates perfectly with your truck’s existing systems, eliminating the need for an expensive trip to the dealership for programming.
Why Choose Our Pre-Programmed 2003–2007 HUMMER H2 PCM?
Getting your vehicle back to factory-spec performance is our top priority. We handle the complex part so you can focus on the simple installation.
- ✔ VIN-Programmed for You: Simply provide your VIN during checkout, and we’ll program the module to match your vehicle’s exact specifications.
- ✔ True Plug-and-Play: No additional programming or dealer visits are required. Once installed, your vehicle is ready to go after a simple security relearn procedure (if applicable).
- ✔ Latest GM Software Updates: We flash the module with the most current GM calibrations, which often include improvements for fuel efficiency, emissions, and drivability that your original module may lack.
- ✔ Solves Common Issues: A direct solution for diagnostic trouble codes (DTCs), harsh shifting, engine stumbling, and intermittent no-start problems related to the PCM.
Expert Pro Tip: Check Your Grounds Before You Swap!
A customer’s ’05 Silverado 2500 came into the shop last month with classic PCM failure symptoms—stalling, random warning lights, and communication errors on the scan tool. Another shop had already quoted them for a new PCM. Before I ordered the part, I did a 5-minute check of the main ground straps from the engine block to the chassis and the battery to the frame. I found the chassis ground near the battery tray was green with corrosion. After cleaning it with a wire brush and re-securing it, every single issue disappeared. Always check your main power and ground connections first; a poor connection can mimic complex electronic failures and save you from replacing a perfectly good part.
Simple Installation to Get You Back on the Road
You don’t need to be a master technician to install this module. With basic hand tools, you can have your truck running smoothly in under an hour.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most of these GM trucks and SUVs, the PCM is located in the engine bay on the driver’s side, often under or next to the battery and near the air filter box.
- Disconnect the Connectors: Carefully unclip and remove the wiring harness connectors from the old PCM. Inspect the pins for any signs of corrosion or damage.
- Swap the Module: Unbolt the old PCM from its mounting bracket and install the new one in its place.
- Reconnect Everything: Securely plug the wiring harnesses into your new PCM and reconnect the negative battery terminal.
- Perform Security Relearn (If Needed): In some cases, you may need to perform a simple key-cycle security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. Your vehicle will then start and run normally.
Guaranteed Fitment and Compatibility
This module is a direct replacement for a wide range of popular 2003-2007 GM vehicles. Please verify your part number against our list. This unit is compatible with the following service numbers: 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. It fits numerous models including the Cadillac Escalade, Chevy Avalanche, Silverado, Suburban, Tahoe, GMC Sierra, Yukon, and Hummer H2. Please use the fitment chart to confirm compatibility with your specific year and model.