Is Your HUMMER H2 Running Rough?
If you’re dealing with frustrating issues like a no-start condition, erratic shifting, a persistent check engine light, or poor fuel economy in your 2003-2007 HUMMER H2, a failing Powertrain Control Module (PCM) is a very likely culprit. As the brain of your vehicle, when the PCM starts to fail, it can cause a cascade of problems that are often misdiagnosed. Over my 20 years in the shop, I’ve seen countless GMT800-platform trucks, like the H2, come in with these exact symptoms, leaving owners chasing expensive and unnecessary repairs.
A Real-World Scenario
“A customer’s 2006 HUMMER H2 was brought in on a tow truck last month. It would crank but not start, and the fuel gauge was reading empty despite a full tank. The owner had already replaced the fuel pump and battery with no success. After a quick diagnostic scan showed multiple communication loss codes, we focused on the PCM. A new, properly programmed module fixed every single issue. It’s a classic failure pattern for these vehicles due to their location under the battery, where they’re exposed to heat, vibration, and potential acid leaks.”
The Direct, Reliable Solution for Your H2
This Powertrain Control Module is the definitive fix for these common issues. We take the guesswork and high dealership costs out of the equation. Each module is meticulously programmed with the latest GM software updates specifically for your vehicle’s VIN. This isn’t a one-size-fits-all part; it’s a tailored solution for your truck.
- ✔ VIN-Specific Programming: We flash the module with your vehicle’s unique VIN, ensuring all factory settings and parameters are correct.
- ✔ Latest GM Updates: Your new PCM will have all the latest software improvements from General Motors, often correcting drivability issues you didn’t even know were software-related.
- ✔ No Dealer Required: This module arrives ready for installation. No need for expensive programming or key relearning at a dealership.
- ✔ Direct Fit Guarantee: This part is a direct replacement for service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802, ensuring a perfect fit.
Easy Plug-and-Play Installation Guide
You can get your 2003-2007 HUMMER H2 PCM installed and running in under an hour with basic hand tools. Follow these simple steps:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On the HUMMER H2, the PCM is located in the engine bay on the driver’s side, typically under or next to the battery tray in a black plastic holder.
- Disconnect Connectors: Carefully unclip and remove the electrical harness connectors from the old PCM. The levers can be stiff, so apply steady pressure.
- Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New PCM: Mount your new, pre-programmed module in the same location and securely re-attach the electrical connectors. You should hear a ‘click’ as they lock into place.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn (If Needed): In most cases, the vehicle will start right up. Sometimes, a simple 10-minute security relearn procedure is needed. Just turn the key to the ‘ON’ position for 10 minutes, then ‘OFF’ for 10 seconds, and repeat two more times before starting the engine. A Crankshaft Variation (CASE) relearn may be required with a capable scan tool to clear a P1336 code, though the vehicle will drive fine without it.
Expert Pro Tip: Connector Inspection
Before plugging in your new PCM, take 60 seconds to inspect the vehicle’s harness connectors. Look for any signs of green or white powdery corrosion on the pins, which is common from battery fumes. Use a quality electronics cleaner and a small nylon brush to gently clean the pins. A clean, solid connection is absolutely critical for the long-term health and performance of your new module.
Don’t let a faulty computer keep your HUMMER sidelined. Order your VIN-programmed PCM today and restore the power, reliability, and smooth operation you expect from your H2.