Is Your 2006 HUMMER H3 Acting Up? Let’s Talk Powertrain Control.
As a technician with over two decades under the hood, I’ve seen it all when it comes to the GM GMT355 platform, which your HUMMER H3 is built on. If you’re experiencing baffling issues like erratic shifting, a rough idle, stalling, or a dreaded no-start condition where everything else checks out, the culprit is often the very brain of your vehicle: the Powertrain Control Module (PCM).
The PCM is the master computer for your engine and transmission. It takes data from dozens of sensorsโcrankshaft position, oxygen levels, throttle inputโand makes thousands of calculations per second to manage fuel delivery, spark timing, and transmission shift points. When it starts to fail, the symptoms can be all over the map, often leading to frustrating and expensive misdiagnoses.
Expert Pro Tip: Before condemning your PCM, I always tell my customers to perform two simple checks. First, ensure your battery is fully charged and the terminals are clean and tight. Second, inspect the main engine-to-chassis ground strap for corrosion or looseness. On these H3 and Colorado/Canyon models, a poor ground can cause voltage fluctuations that mimic a failing PCM. I’ve saved people hundreds of dollars in my shop with this five-minute check.
The Right Solution: A Properly Programmed PCM
If you’ve ruled out the basics and confirmed the PCM is the problem, simply swapping in a used one from a junkyard won’t work. The module is electronically tied to the original vehicle’s VIN and security system. This is where our service becomes essential. We provide a replacement PCM, part number 19209820, that is professionally programmed to your H3’s specific Vehicle Identification Number (VIN) before it ships. This ensures compatibility and a much smoother installation process.
What You Get With This Module:
- โ VIN-Specific Programming: We flash the module with your vehicle’s VIN, ensuring it communicates correctly with the other modules in your truck, like the BCM and anti-theft system.
- โ Latest GM Software: Your PCM will be loaded with the newest factory software updates from General Motors. These updates often correct drivability issues and bugs that were present in the original programming.
- โ Direct-Fit Replacement: This module is a direct physical replacement for a wide range of original part numbers, making the physical swap straightforward.
- โ A Path to Resolution: This is the definitive fix for a failed PCM, restoring proper engine performance, fuel economy, and transmission operation.
Installation and Compatibility
This PCM is located on the right-hand (passenger side) of the firewall in your 2006 HUMMER H3. While the physical swap involves just a few connectors and mounting bolts, please be aware that a security relearn procedure (often called a ‘key cycle relearn’) may be necessary after installation for the vehicle to start. This procedure is simple and can typically be done in your driveway without special tools.
This Module Correctly Replaces The Following Part Numbers:
12569773, 12588650, 12589311, 12589585, 12591647, 12591648, 12593531, 12593532, 12594430, 12594431, 12596783, 12596784, 12597521, 12597776, 12597777, 12600818, 12604438, 12604439, 12606369, 12606373, 12606374, 12606398, 12606399, 19209820, 19209821
Guaranteed Fitment For:
- โ HUMMER H3: 2006
- โ Chevrolet Colorado: 2004-2006
- โ GMC Canyon: 2004-2006
- โ Buick Rainier: 2006 (4.2L)
- โ Chevrolet Trailblazer / EXT: 2006 (4.2L)
- โ GMC Envoy / XL: 2006 (4.2L)
- โ Isuzu Ascender: 2006 (4.2L)
- โ Isuzu i-280 / i-350: 2006
- โ Saab 9-7x: 2006 (6-cylinder)