Is Your Hummer H2 Running Rough or Not Starting?
As a mechanic with over two decades of experience under the hood, I’ve seen my fair share of GM trucks and SUVs come into the shop with baffling issues. A 2005 Hummer H2 might have a persistent check engine light, a 2006 Silverado might refuse to shift correctly, or a 2004 Tahoe might crank but never start. Often, the root cause isn’t a bad sensor or a faulty fuel pump—it’s the vehicle’s brain, the Powertrain Control Module (PCM).
The PCM is the central command center for your engine and transmission. When it fails, it can cause a cascade of problems that can be frustrating and difficult to diagnose. This replacement PCM, part number 28042802, is the definitive solution to restore your vehicle’s performance and reliability.
The Simple, Reliable Fix for Complex Problems
Don’t let a faulty computer keep your truck off the road. This module is the answer you’ve been looking for, solving common and frustrating symptoms:
- âś” No-Start or Hard-Starting Conditions: Restores proper fuel and spark control to get your engine firing up reliably every time.
- âś” Check Engine Light (CEL) Illumination: Fixes internal module faults that trigger persistent diagnostic trouble codes (DTCs).
- âś” Poor Fuel Economy: Corrects improper air/fuel mixture calculations, saving you money at the pump.
- âś” Erratic Shifting or Transmission Issues: Re-establishes clear communication between the engine and transmission for smooth, predictable gear changes.
- âś” Stalling or Rough Idle: Stabilizes engine operations by precisely managing all critical sensor inputs and outputs.
Expert Pro Tip: Check Before You Replace
Before you condemn your old PCM, take a moment to inspect the electrical connectors and the main ground wire. On these GM trucks, the PCM is often located under the battery tray. Over the years, battery acid can leak and corrode the terminals on the PCM connectors, causing all sorts of electrical gremlins that mimic a failed module. A simple cleaning with a wire brush and electrical contact cleaner can sometimes solve the problem. If the connections are clean and tight, and the issues persist, then a faulty PCM is the likely culprit.
Plug-and-Play Installation for your 2003-2007 Hummer H2 PCM
We make this repair as straightforward as possible. We flash the module with the latest GM software updates using the VIN you provide. This means it arrives at your door ready to install, with no expensive trip to the dealership for programming required. You can do this right in your driveway.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most Hummer H2 and similar GM trucks, it’s found on the driver’s side of the engine bay, under the battery tray or next to the airbox.
- Disconnect the Old Module: Carefully unplug the electrical harness connectors. They have locking tabs that need to be released.
- Remove the Old PCM: Unbolt the module from its mounting bracket.
- Install the New PCM: Mount your new, pre-programmed module and securely reconnect the harnesses. You should hear a ‘click’ as they lock in place.
- Reconnect the Battery: Attach the negative battery terminal. Your vehicle is now ready to start.
Guaranteed Compatibility and Performance
This module is a direct replacement for a wide range of popular GM vehicles. By providing your Vehicle Identification Number (VIN) at checkout, you ensure we load the exact software calibration for your truck’s specific engine, transmission, and options. This unit is a direct replacement for service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. Check the extensive fitment list to confirm this is the correct part for your vehicle and get back on the road with confidence.