Is Your Hummer H2 Running Rough, Stalling, or Refusing to Start?
If you’re dealing with a frustrating Check Engine Light, unpredictable engine behavior, or a complete no-start situation in your 2003-2007 Hummer H2, a failing Powertrain Control Module (PCM) is a very likely culprit. As the central computer for your engine and transmission, when the PCM goes bad, it can cause a cascade of problems that can sideline your vehicle. I’ve seen it countless times in the shop: a perfectly good engine that won’t run right simply because the computer has failed.
Expert Pro Tip from a 20-Year Technician
Before you install your new PCM, do a quick visual inspection of the wiring harness connectors. Over the years, the connector seals can become brittle, allowing moisture and dirt to get in. I recommend using a small nylon brush and some electrical contact cleaner to gently scrub the pins and sockets on the vehicle’s harness. A clean, solid connection is critical for the new module to function correctly and will prevent a host of frustrating, hard-to-diagnose issues down the road.
The Direct-Fit Solution: A Pre-Programmed Hummer H2 PCM
Forget expensive dealership visits and the hassle of finding a shop that can program a new module. This PCM, part number 89017750, is the reliable, straightforward solution you need. We take all the guesswork out of the repair. Simply provide us with your vehicle’s VIN during checkout, and our technicians will flash the module with the latest, most stable GM-approved software specific to your H2. It arrives at your door ready to install, no extra steps required.
Common Symptoms of a Failing H2 PCM:
- โ Check Engine Light is on with communication-related codes (e.g., U-codes).
- โ Engine cranks but will not start.
- โ Harsh or erratic shifting from the automatic transmission.
- โ Unexplained stalling, especially when coming to a stop or at idle.
- โ Poor fuel economy and noticeable loss of power.
- โ Inconsistent or non-functional gauges on the instrument cluster.
- โ The scan tool cannot communicate with the PCM.
Plug-and-Play Installation: No Dealer Visit Required
You can get your Hummer H2 back on the road in under an hour with basic hand tools. This module is designed for a direct, simple installation.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: On most Hummer H2 models, the PCM is located in the engine bay on the driver’s side, under a plastic cover, often near the battery.
- Disconnect the Harnesses: Carefully release the locking tabs and unplug the electrical connectors from the old PCM. There are typically three main connectors.
- Remove the Old Module: Unbolt the mounting bracket holding the PCM in place and remove the old unit.
- Install the New PCM: Mount your new, pre-programmed PCM, reconnect the electrical harnesses until they click securely, and re-install any covers.
- Reconnect the Battery: Re-attach the negative battery terminal. Your H2 is now ready to start with its new brain.
Guaranteed Compatibility
This module is a direct replacement for a wide range of GM trucks and SUVs from this era. It is fully compatible with service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. By programming it to your specific VIN, we ensure it functions exactly as the original did, restoring your vehicle’s performance and reliability.