Restore Your Hummer’s Power and Reliability
Is your 2006 Hummer H3 feeling less like a rugged off-roader and more like an unpredictable headache? If you’re dealing with a persistent Check Engine Light, erratic engine behavior, poor fuel mileage, or even a no-start condition, the culprit is often a failing Powertrain Control Module (PCM). This module is the brain of your vehicle, controlling everything from fuel injection and spark timing to transmission shifting. When it falters, the entire vehicle’s performance suffers. This replacement PCM is the definitive solution to get your H3 running like new again.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take a genuine OEM module and program it specifically to your vehicle’s unique Vehicle Identification Number (VIN). This process ensures that the computer has the correct software and calibrations for your H3’s specific options and emissions equipment. We also load the latest software updates from GM, which can resolve factory bugs and improve overall performance and efficiency. By providing us with your VIN upon purchase, you eliminate the need for an expensive trip to the dealership for programming.
From the Diagnostic Bay
We had a 2006 H3 in the shop that was driving its owner crazy. It would randomly stall at stoplights, and the transmission would sometimes shift harshly. The owner had already replaced the throttle body and a couple of sensors with no luck. We scanned it and found a P0606 code (PCM Processor Fault) stored in memory. After verifying the power and ground circuits to the module were solid, we knew the internal processor was failing. We installed one of our VIN-programmed PCMs, performed the security relearn, and the H3 ran perfectly. It’s a classic example of how a faulty PCM can mimic other component failures, making accurate diagnosis key.
Common Symptoms of a Failing 2006 HUMMER H3 PCM
A failing PCM can manifest in various ways. If you’re experiencing any of the following issues, it’s a strong indication that your engine computer needs replacement. A proper diagnosis is always recommended, but these are the most common signs:
- ✔ Persistent Check Engine Light (CEL) with communication-related codes (U-codes) or internal processor fault codes (P06xx codes).
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Rough or erratic idling.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Failure to pass an emissions test.
- ✔ Intermittent or complete no-start condition where the engine cranks but won’t fire.
- ✔ Loss of communication with the diagnostic scan tool.
Direct Fit for a Wide Range of GM Vehicles
While this is a perfect solution for your Hummer H3, this versatile module is also the correct electronic control unit for a variety of other GM trucks and SUVs from the same era. It is a direct replacement for multiple part numbers, including 12569773, 12588650, 12591647, 12597521, 12606373, and many more. It is engineered to work seamlessly with the following vehicles:
- 2004-2006 Chevrolet Colorado
- 2004-2006 GMC Canyon
- 2006 Buick Rainier (4.2L)
- 2006 Chevrolet Trailblazer & Trailblazer EXT (4.2L)
- 2006 GMC Envoy & Envoy XL (4.2L)
- 2006 Hummer H3
- 2006 Isuzu Ascender (4.2L), I-280, & I-350
- 2006 Saab 9-7X (6 cylinder)
After installation, the only remaining step is typically a security relearn procedure, also known as a key relearn. This simple process syncs the new PCM with your vehicle’s anti-theft system and can usually be done in your driveway with no special tools. Instructions are readily available online or in your vehicle’s service manual.
Frequently Asked Questions
Will this PCM be “plug and play”?
Yes, for the most part. Because we program the module to your VIN, it will have the correct software for your engine and transmission. However, you will need to perform a security relearn procedure after installation. This is a simple process that takes about 30 minutes and only requires your ignition key.
Do I need to send my old computer back?
No, there is no core charge or need to return your old module. This is an outright purchase of a replacement PCM.
How do I provide my VIN for programming?
After you complete your purchase, you can send us a message with your 17-digit VIN. Alternatively, you can add your VIN to the ‘notes’ section during checkout. We cannot ship your order until we receive your VIN.
My original part number isn’t on the list, will this still work?
This module replaces a wide range of original part numbers. The list provided in the description covers the most common ones. If your part number is not listed, please contact us with your VIN, and we can verify compatibility for you.
What if I have issues after installation?
Our goal is your complete satisfaction. If you encounter any problems, please contact us immediately. Many issues can be resolved with simple troubleshooting, such as ensuring the security relearn was performed correctly or checking for other vehicle faults that may be present.