Restore Peak Performance to Your HUMMER H3
If your 2006 Hummer H3 is giving you headaches with unpredictable stalling, a persistent check engine light, or a frustrating no-start condition, the root cause is often a failing Powertrain Control Module (PCM). As the brain of your vehicle’s engine and transmission, a faulty PCM can create a cascade of electrical gremlins that are difficult to diagnose. This isn’t just an inconvenience; it’s a reliability issue that can leave you stranded. I’ve seen it countless times in my 20+ years on the shop floor—a perfectly good engine crippled by a bad computer.
This is your direct-fit, straightforward solution. We provide a high-quality replacement 2006 HUMMER H3 PCM that arrives at your door programmed and ready for installation. Simply provide us with your vehicle’s VIN during checkout, and our technicians will flash the module with the latest GM software updates specific to your H3. This critical step ensures all systems communicate correctly, restoring the smooth operation and fuel efficiency you expect from your vehicle without a trip to the dealership for expensive programming.
Case Study: A Tricky Diagnosis
A customer brought in a 2006 Chevy Colorado—which uses this exact same PCM platform—with an intermittent no-start and a random stalling problem that two other shops couldn’t solve. There were no consistent trouble codes, just a generic U0100 (Lost Communication) code that would pop up occasionally. After verifying the wiring harness and power/ground circuits were solid, we focused on the PCM. On the surface, it seemed fine. But under load, we found its 5-volt reference signal would drop intermittently, starving the sensors of power and shutting the engine down. Swapping in a properly programmed PCM like this one solved the issue instantly. It’s a classic example of how a failing computer can create phantom problems that defy typical diagnostics.
Is Your Hummer H3 Showing These Signs?
A failing PCM can manifest in various ways. If you’re experiencing any of the following, it’s a strong indicator that your engine computer needs attention:
- âś” Check Engine Light is on with codes like P0601, P0602, P0606, or U0100
- âś” Engine cranks but refuses to start
- âś” Unexplained stalling, especially when coming to a stop
- âś” Rough or erratic idling
- âś” Noticeable decrease in fuel economy
- âś” Harsh or incorrect shifting from the automatic transmission
- âś” Failure to pass an emissions test
A Straightforward Guide to Installation
Replacing the 2006 HUMMER H3 PCM is a job most DIYers can handle in their own driveway. On the H3, the module is conveniently located and accessible.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On the 2006 H3, you’ll find the PCM mounted to the firewall on the right-hand (passenger) side of the engine bay.
- Disconnect the Connectors: Carefully unclip and remove the electrical harness connectors from the old module. They have locking tabs, so be gentle.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket on the firewall and set it aside.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely fasten the bolts.
- Reconnect Everything: Plug the electrical connectors firmly into the new module until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn (If Needed): In most cases, a simple key-on procedure is all that’s required. Turn the key to the ‘ON’ position (without starting) for 10-15 minutes. The ‘Security’ light should turn off. Turn the key off, wait 30 seconds, and then start the engine. Your vehicle is ready to drive.
Verified Vehicle Compatibility
This module is a direct replacement for part number 12569773 and is guaranteed to fit the following vehicles. It also interchanges with numerous other part numbers, ensuring broad compatibility (see list in product details).
- HUMMER H3: 2006 (RH firewall)
- CHEVROLET COLORADO: 2004-2006 (RH firewall)
- GMC CANYON: 2004-2006 (RH firewall)
- CHEVROLET TRAILBLAZER & TRAILBLAZER EXT: 2006 (4.2L, LH engine)
- GMC ENVOY & ENVOY XL: 2006 (4.2L, LH engine)
- BUICK RAINIER: 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, ID 12569773 or 12597521, LH engine)
Frequently Asked Questions
Do I need to get this PCM programmed by a dealer?
No. The main benefit of our service is that this module arrives at your door fully programmed for your specific vehicle using the VIN you provide. This makes it a plug-and-play installation, saving you time and money.
Where is the PCM located on my 2006 Hummer H3?
The powertrain control module on the 2006 H3 is located in the engine bay, mounted to the firewall on the passenger side (RH side) of the vehicle.
What information do you need from me?
After you complete your purchase, we will need your 17-digit Vehicle Identification Number (VIN). This allows us to load the correct, updated GM software for your vehicle’s specific configuration.
Will this fix my check engine light?
If the check engine light is caused by an internal PCM failure (such as code P0601), then yes, this replacement 2006 HUMMER H3 PCM will resolve the issue. However, if the code is for a faulty sensor or other component, that part will still need to be addressed.
Is this compatible with other part numbers?
Yes. This module is a direct replacement for a wide range of GM part numbers, including 12588650, 12591647, 12597521, 12606399, and many others listed in the product details to ensure you get the right part.