Restore Your Hummer’s Core Performance and Reliability
Is your 2003-2007 HUMMER H2 or GM truck experiencing frustrating issues like stalling, erratic shifting, a persistent check engine light, or a complete no-start condition? These are classic signs that the vehicle’s brain—the Powertrain Control Module (PCM)—is failing. Don’t let a faulty computer keep your powerful truck sidelined. This replacement PCM is the definitive solution, arriving at your door pre-programmed with the latest official GM software tailored specifically to your vehicle’s VIN. This eliminates the need for expensive dealership visits and gets you back on the road with confidence.
As the central command center for your truck, the PCM manages everything from fuel injection and spark timing to transmission shift points and emissions equipment. When it fails, the symptoms can be widespread and confusing. Over my 20+ years in diagnostics, I’ve seen countless owners replace perfectly good sensors and parts, only to find the root cause was the PCM all along. This module is a direct-fit replacement for service number 28042802 and other compatible numbers, ensuring a seamless and effective repair for your 2003-2007 HUMMER H2 PCM and a wide range of other GM vehicles.
Case Study: A Tricky Diagnosis
A customer brought in a 2006 Sierra 2500 with the 6.0L, complaining of harsh, unpredictable shifting and a flashing check engine light. His transmission shop couldn’t find a mechanical fault. After scanning, I found a U0100 (Lost Communication with ECM/PCM) and a P0606 (PCM Processor Fault). While the symptoms pointed to the transmission, the codes told a different story. The PCM’s internal processor was failing, sending garbled commands to the transmission. We installed a VIN-programmed PCM, performed the security relearn, and the truck drove like new. It’s a perfect example of how a failing 2003-2007 HUMMER H2 PCM can mimic other problems, making accurate diagnosis key.
Is Your Truck Showing These Symptoms?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, this module is likely the solution you need:
- ✔ Check Engine Light is on with codes like P0601, P0602, P0606, or U0100.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drop in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine stalling or running rough for no apparent reason.
- ✔ Communication errors with diagnostic scan tools.
A Straightforward Guide to Installation
Replacing your PCM is a manageable job for a DIYer with basic tools. Our VIN programming makes it a true plug-and-play repair. Follow these general steps for a successful installation:
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
- Locate the PCM: On most compatible models like the HUMMER H2, Silverado, and Sierra, the PCM is located in the engine bay on the driver’s side, often under or next to the battery tray.
- Disconnect the Connectors: Carefully unlatch and remove the wiring harness connectors from the old PCM. The levers can be stiff, so apply steady pressure. Inspect connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. It’s typically held by a few bolts (often 10mm or 13mm).
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely fasten the bolts.
- Reconnect Everything: Plug the wiring harnesses firmly into the new module until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn: You will 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. This allows the vehicle’s anti-theft system to recognize the new PCM.
Verified Vehicle Compatibility
This module is a direct replacement for service numbers 89017750, 12582605, 12589463, 12602802, and 89017734. It is guaranteed to fit a wide range of GM trucks and SUVs. Please verify your model and year from the list below. This is a vital component, so ensuring you have the correct 2003-2007 HUMMER H2 PCM or compatible part is our top priority.
2003-2006 Cadillac Escalade, ESV, EXT
2003-2007 Chevrolet Silverado 1500/2500/3500
2003-2006 Chevrolet Suburban 1500/2500
2003-2006 Chevrolet Tahoe
2003-2006 Chevrolet Avalanche 1500
2003-2007 GMC Sierra 1500/2500/3500
2003-2007 GMC Sierra Denali
2003-2006 GMC Yukon & Yukon XL 1500/2500
2003 GMC Envoy XL
2003 Isuzu Ascender
2003 Chevrolet SSR
2003 Chevrolet Trailblazer EXT
(Note: Please match your specific options, engine size, and service ID for certain years as noted in the full compatibility chart.)
Frequently Asked Questions
What do you mean by ‘VIN Programmed’?
Before we ship your PCM, our technicians use your vehicle’s 17-digit Vehicle Identification Number (VIN) to load the exact, most current GM factory software for your specific truck. This ensures it works perfectly with your engine, transmission, and options, just like a module from the dealer, but without the hassle.
Do I need any special tools to install this?
No. Because the module is pre-programmed, you will not need a dealership scan tool. Basic hand tools (like a socket set) for removing the old module are all that’s required. You will need to perform a simple ‘Security Relearn’ procedure with your key, which we provide instructions for.
Where do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your VIN. We cannot program and ship the module until we receive this information, so please provide it promptly to avoid delays.
Will this fix my check engine light?
If the check engine light is caused by an internal PCM failure (common codes P0601-P0606), then yes, this part will resolve the issue. However, if the light is on for another reason, such as a bad oxygen sensor or gas cap, you will still need to address that separate issue.