Is your 2006 HUMMER H3 running rough, stalling unexpectedly, or showing a persistent Check Engine Light? You’re not just driving; you’re managing a complex machine, and the brain of that machine is the Powertrain Control Module (PCM). When it falters, everything from fuel economy to engine performance suffers. I’ve seen it countless times in my 20+ years in the shop: a perfectly good engine held back by a failing computer. This isn’t just a replacement part; it’s the restoration of your H3’s reliability and power.
We solve the biggest headache of PCM replacement: programming. Forget expensive dealership visits and complex diagnostic tools. This module arrives at your door fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We load the latest, most stable GM factory software, ensuring all systems communicate flawlessly from the moment you install it. This is the direct, professional-grade solution that gets you back on the road with confidence.
From the Diagnostic Bay
A customer brought in his ’06 H3 with a frustrating issue. It would start and run fine when cold, but after 20 minutes of driving, it would stall at a stoplight and refuse to restart for at least half an hour. There were no consistent trouble codes, just a random U0100 (Lost Communication) every now and then. This is a classic symptom of internal PCM failure due to heat soak. The solder joints inside the module expand and break contact when hot. We swapped in one of our VIN-programmed modules, and the problem was solved instantly. It’s a fix I’ve performed on dozens of these GM platforms, and it underscores the importance of a quality, correctly programmed module.
Is Your HUMMER H3 Showing These Signs?
A failing PCM can cause a wide range of confusing symptoms. If you’re experiencing any of the following, this module is the likely solution:
- ✔ Persistent Check Engine Light with codes like P0601, P0602, P0606 (Internal Control Module Processor Error).
- ✔ Engine stalls for no reason, especially after warming up.
- ✔ Vehicle refuses to start or has a long crank time.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication errors with scan tools.
A Straightforward Guide to Installation
You don’t need to be a master mechanic to install this part. With basic hand tools, you can have your H3 running right in under an hour. Our pre-programming makes this a true plug-and-play repair.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait 10 minutes for the system to discharge completely.
- Locate the PCM: On the 2006 HUMMER H3, the PCM is located on the right-hand (passenger) side of the firewall in the engine bay.
- Disconnect the Connectors: Carefully release the locking tabs on the electrical wiring harnesses and pull them straight out from the module. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. It’s typically held in by a few small bolts.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and secure it.
- Reconnect and Finalize: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect your battery terminal. Your vehicle is now ready to start.
The Importance of a VIN-Programmed 2006 HUMMER H3 PCM
Your H3 has specific options for its engine, transmission, and emissions systems. Simply installing a generic or junkyard computer will almost certainly lead to compatibility issues and warning lights. By providing your VIN, you allow us to flash this module with the exact software your vehicle left the factory with, plus any subsequent updates from GM for improved performance and reliability. This ensures every component works together as intended.
Verified Vehicle Compatibility
This module is a direct replacement for part number 12597776 and a wide range of interchangeable numbers. It is guaranteed to fit the following vehicles:
- ✔ HUMMER H3: 2006 (RH firewall)
- ✔ Chevrolet Colorado: 2004-2006 (RH firewall)
- ✔ GMC Canyon: 2004-2006 (RH firewall)
- ✔ Buick Rainier: 2006 (4.2L, LH engine)
- ✔ Chevrolet Trailblazer & Trailblazer EXT: 2006 (4.2L, LH engine)
- ✔ GMC Envoy & Envoy XL: 2006 (4.2L, LH engine)
- ✔ Isuzu Ascender: 2006 (4.2L, LH engine)
- ✔ Isuzu i-280 & i-350: 2006 (RH firewall)
- ✔ Saab 9-7x: 2006 (6-cylinder)
This unit is compatible with part numbers: 12569773, 12588650, 12589311, 12589585, 12591647, 12591648, 12593531, 12593532, 12594430, 12594431, 12596783, 12596784, 12597521, 12597777, 12600818, 12604438, 12604439, 12606369, 12606373, 12606374, 12606398, 12606399, 19209820, 19209821, and more.
Frequently Asked Questions
Is this part really plug-and-play?
Yes. Because we program the module to your vehicle’s VIN before shipping, it arrives ready for installation with no additional programming or dealer visits required.
Where do I find my VIN?
Your 17-digit Vehicle Identification Number (VIN) is located on a tag on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, and on your vehicle’s registration and insurance documents.
Will this fix my specific problem?
This PCM is the solution for issues directly caused by a failing computer, such as internal processor faults (P0601), no-start conditions, and erratic engine behavior. Proper diagnosis is key, but if your symptoms match those listed, this is the definitive repair.
Do I need to perform a security relearn procedure?
On some GM vehicles of this era, a simple security relearn procedure may be necessary after installation. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. We include simple instructions if this is required for your vehicle.
What if my original part number is slightly different?
The list of compatible part numbers is extensive. As long as your vehicle model and year are listed, this module will function correctly, as it contains the latest software that supersedes older part number calibrations.