Is Your 2006 HUMMER H3 Running Rough? The PCM Might Be the Culprit.
The Powertrain Control Module, or PCM, is the central computer of your 2006 HUMMER H3. It’s responsible for managing everything from the engine’s fuel mixture and ignition timing to the transmission’s shift points. When this critical component begins to fail, it can cause a wide range of frustrating and often mysterious issues that can leave you stranded. If you’re dealing with persistent check engine lights, poor performance, or intermittent stalling, you’ve come to the right place for a reliable solution.
This isn’t just a replacement part; it’s a direct-fit, fully programmed solution engineered to restore your vehicle’s factory performance. We take the guesswork and high dealership costs out of the equation. By providing us with your vehicle’s VIN (Vehicle Identification Number) during checkout, our technicians will flash this module with the latest, most stable software updates directly from GM. This ensures that when the part arrives, it’s ready for installation, communicating seamlessly with all the other modules and sensors in your H3.
From the Diagnostic Bay
We had a 2006 Hummer H3 come into the shop with a complaint of random stalling and a check engine light for a throttle position sensor code. The owner had already replaced the throttle body twice with no success. After hooking up our scanner and monitoring live data, we noticed the 5-volt reference signal from the PCM was dropping out intermittently, causing the throttle sensor to read incorrectly. It wasn’t the sensor or the throttle body at all; the fault was internal to the original PCM. We installed one of our VIN-programmed modules, performed the security relearn, and the truck ran perfectly. It’s a classic case of chasing symptoms when the root cause lies with the vehicle’s main computer.
Common Symptoms of a Failing H3 PCM
- ✔ Check Engine Light is on with various, often inconsistent, trouble codes.
- ✔ Engine stalling or shutting off unexpectedly while driving.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Noticeable decrease in fuel economy.
- ✔ Rough idling or misfiring.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Other warning lights on the dash, like ABS or traction control, may illuminate.
Why Choose Our Programmed 2006 HUMMER H3 PCM?
Getting your Hummer back on the road shouldn’t be a complicated ordeal. Our process is designed for both professional technicians and capable DIY mechanics. The core of our service is the VIN-specific programming. This critical step ensures the module is correctly configured for your H3’s specific options, engine type, and emissions standards. This unit arrives ready to be installed, saving you a costly trip to the dealership for programming services. It’s a plug-and-play solution that gets you back in the driver’s seat faster.
This module is a direct replacement for a wide range of original equipment part numbers, ensuring broad compatibility. Please verify your original part number against the list below for a guaranteed match.
Replaces 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
Installation Note
While this 2006 HUMMER H3 PCM is programmed for your vehicle, installation may require a security relearn procedure to sync the new module with your vehicle’s anti-theft system. This is a standard procedure that can often be done without special tools and typically involves a series of key cycles. Instructions for this procedure are widely available online or in service manuals.
Frequently Asked Questions
Do I need to send my old PCM in?
No, there is no core charge or need to send your original module to us. This is a direct purchase.
What information do you need to program the module?
We require your vehicle’s 17-digit Vehicle Identification Number (VIN). Please provide it during checkout or send it to us in a message after your purchase to avoid shipping delays.
Is this PCM difficult to install?
The physical installation is straightforward for someone with basic mechanical skills. It is typically located on the right-hand (passenger side) firewall. The most important step after installation is performing the security relearn procedure to sync the module with your keys.
Will this fix my specific problem?
A failing PCM can cause a wide variety of symptoms. While this part will resolve issues directly caused by a faulty module, it’s crucial to ensure your vehicle has been properly diagnosed. This part will not fix problems related to other faulty sensors, wiring, or mechanical components.
Does this part come with a warranty?
Yes, all of our electronic modules come with a standard warranty. Please see the warranty tab on this listing for complete details and duration.