Restore Peak Performance to Your GM Truck or SUV
Is your 2003-2007 HUMMER H2 or other GM vehicle plagued by frustrating issues like stalling, erratic shifting, a persistent check engine light, or a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the electronic brain of your vehicle. A faulty PCM can disrupt everything from fuel delivery and spark timing to transmission control, making your truck unreliable. This replacement PCM, part number 89017750, is the definitive solution to restore your vehicle’s original performance and dependability.
With over 20 years of hands-on diagnostic experience, I’ve seen countless vehicles sidelined by PCM failure. The symptoms can be confusing, often mimicking other sensor or component failures. However, when you see communication codes like U0100 or internal processor faults like P0601, the PCM is almost always the culprit. We take the guesswork and hassle out of the repair. This module isn’t just a part; it’s a complete, ready-to-install solution. We flash it with the latest official GM software, programmed specifically to your vehicle’s VIN. This ensures perfect compatibility and function right out of the box, saving you a trip to the dealership and expensive programming fees.
Case Study: The Ghost in the Silverado
A customer brought in a 2005 Silverado 2500 with the 6.0L engine—a truck that uses this exact PCM. The complaint was intermittent stalling at stoplights and a random loss of power on the highway. He had already replaced the throttle body and a few sensors with no luck. The only codes stored were a history code for U0100 (Lost Communication with ECM/PCM) and a pending P0606 (PCM Processor Fault). After verifying the power and ground circuits to the PCM were solid, it was clear the module itself was failing internally. We installed one of our VIN-programmed PCMs, performed the security relearn, and the truck ran perfectly. The customer was thrilled to have his reliable workhorse back without wasting more money on unnecessary parts.
Is Your Vehicle Showing These Symptoms?
- ✔ Check Engine Light is on with codes like P0601, P0602, P0606, or U0100.
- ✔ The engine cranks but refuses to start.
- ✔ Your vehicle experiences unexplained stalling or hesitation.
- ✔ The transmission is shifting harshly, late, or not at all.
- ✔ You’ve noticed a sudden, significant drop in fuel economy.
- ✔ Other warning lights (ABS, Security) are on, and communication with the scan tool is intermittent.
A Straightforward Guide to Installation
Installing your new 2003-2007 HUMMER H2 PCM is a job most DIYers can handle in their garage. While the physical swap is simple, a critical security relearn procedure is required afterward to sync the new module with your vehicle’s anti-theft system.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most compatible trucks and SUVs (like the Hummer H2, Silverado, and Tahoe), the PCM is located under the hood on the driver’s side, typically next to or under the battery tray.
- Disconnect Connectors: Carefully release the locking tabs and unplug the wiring harness connectors from the old PCM. The levers can be stiff, so be gentle but firm.
- Remove the Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New PCM: Mount your new, pre-programmed PCM into the bracket and securely plug in the wiring harness connectors. Ensure they click into place.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn: This step is essential. Try to start the engine; it will likely crank but not run, and the security light will be on or flashing. Turn the key to the ‘ON’ position (do not start) for 10-12 minutes, or until the security light goes out. Turn the key off for 10 seconds. Repeat this cycle two more times (for a total of 3 cycles / 30 minutes). The vehicle should now start and run. A CASE (Crankshaft Angle Sensor Error) relearn may be needed with a capable scan tool for optimal performance, but the vehicle will be driveable.
Verified Vehicle Compatibility
This module is a direct replacement for service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. It fits a wide range of GM vehicles. Please verify your model and year from the list below. Note that for some 2004 models, matching the ID number 12602802 is important.
- HUMMER H2: 2003, 2004, 2005, 2006, 2007
- Cadillac Escalade, ESV, EXT: 2003-2006
- Chevrolet Avalanche 1500: 2003-2006
- Chevrolet Silverado 1500/2500/3500: 2003-2007 (Classic)
- Chevrolet Suburban 1500/2500: 2003-2006
- Chevrolet Tahoe: 2003-2006
- GMC Sierra 1500/2500/3500 & Denali: 2003-2007 (Classic)
- GMC Yukon & Yukon XL 1500/2500: 2003-2006
- And more, including select Isuzu Ascender, Chevrolet SSR, Envoy XL, and Trailblazer EXT models.
Get your truck back on the road with confidence. This pre-programmed 2003-2007 HUMMER H2 PCM is the most reliable and efficient way to solve complex electronic issues.
Frequently Asked Questions
How does the VIN programming work?
After you place your order, you will need to provide us with your 17-digit Vehicle Identification Number (VIN). We use this to load the exact, latest GM-approved software for your specific vehicle configuration before we ship the part to you.
Is the Security Relearn procedure difficult?
Not at all! It requires no special tools, just patience. The 30-minute key-on/key-off procedure works for the vast majority of vehicles and allows the new PCM to recognize your vehicle’s keys and anti-theft system.
What if I install this and my problem doesn’t go away?
While this PCM fixes the listed symptoms in most cases, we always recommend proper diagnostics. If the module does not solve your issue, it’s possible there is an underlying problem (like a wiring short or a faulty sensor) that needs to be addressed. Our module is guaranteed to be a functional, correctly programmed component.
Will this PCM require any other programming at the dealership?
No. Our service is designed to completely eliminate the need for dealer programming. It arrives ready to be installed and for you to perform the security relearn procedure.
Is this compatible with my engine?
This PCM is compatible with a wide range of GM gasoline engines from this era, including the 5.3L and 6.0L V8s. Providing your VIN ensures we load the correct software for your specific engine and transmission combination.