Is your Hummer H3 feeling sluggish, unpredictable, or throwing confusing check engine lights? A faulty Powertrain Control Module (PCM) is often the hidden culprit behind these frustrating issues, acting as the brain of your vehicle’s engine and transmission. When it fails, it can disrupt everything from fuel delivery to shift points, leaving you with a vehicle you can’t trust. This isn’t just an inconvenience; it’s a matter of confidence and safety on the road. Get back the powerful, dependable performance your H3 was built for with this direct-fit, pre-programmed engine computer.
We take the guesswork and dealer expense out of the equation. Each module is meticulously flashed with the latest official GM software, tailored specifically to your vehicle’s unique Vehicle Identification Number (VIN). This ensures that once it arrives, it’s ready for a straightforward installation, communicating perfectly with all of your Hummer’s existing systems. Regain that worry-free drive and the peace of mind that comes from a solid, reliable repair.
A Mechanic’s Note on Installation
One of the most common questions I get is about post-installation procedures. While this module comes fully programmed to your VIN, your H3’s anti-theft system (Passlock/VATS) will need to relearn the new PCM. This is a simple procedure you can do yourself in about 30 minutes with just your key—no special tools required! It’s a crucial step to ensure your vehicle starts and runs correctly. Taking a moment to do this correctly prevents the headache of a no-start situation and solidifies a successful repair.
Warning Signs and How to Overcome Them
If you’re experiencing any of the following, a failing PCM could be the cause. Replacing your old unit with this pre-programmed module can resolve these common headaches:
- ✔ Unexplained Check Engine Light (CEL) illumination
- ✔ Diagnostic Trouble Codes (DTCs) like P0601, P0606, or communication errors
- ✔ Poor or erratic automatic transmission shifting
- ✔ A sudden, noticeable drop in fuel economy
- ✔ Engine stalling, stumbling, or rough idling
- ✔ Intermittent no-start conditions
- ✔ Failure to pass emissions testing
Effortless Steps for a Confident Fix
Installing your new 2006 HUMMER H3 PCM is a manageable job for a confident DIYer. Follow these general steps for a smooth replacement:
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the Old PCM: On your H3, the PCM is typically located on the right-hand (passenger) side of the firewall in the engine bay.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Mount the new PCM in the same location and securely reconnect the wiring harnesses. Ensure they click into place.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn: This is a critical step. Turn the key to the ‘ON’ position (without starting) for 10-15 minutes, then ‘OFF’ for 10 seconds. Repeat this cycle 3 times. On the fourth try, the vehicle should start, confirming the relearn is complete.
Guaranteed Compatibility for Your Vehicle
This Powertrain Control Module is a direct replacement for part number 12569773 and is guaranteed to fit the following vehicles. We program it using your VIN to ensure it works perfectly with your specific model and options.
- HUMMER H3: 2006
- Chevrolet Colorado: 2004-2006
- GMC Canyon: 2004-2006
- Chevrolet Trailblazer / Trailblazer EXT: 2006 (4.2L)
- GMC Envoy / Envoy XL: 2006 (4.2L)
- Buick Rainier: 2006 (4.2L)
- Isuzu Ascender: 2006 (4.2L)
- Isuzu i-280 / i-350: 2006
- Saab 9-7x: 2006 (6 cylinder)
This unit replaces a wide range of part numbers, including: 12588650, 12589311, 12591647, 12594430, 12596783, 12597521, 12604438, 12606369, and more.
Don’t let a faulty computer keep your capable truck off the road. By providing your VIN at checkout, you ensure you receive a fully updated 2006 HUMMER H3 PCM that is truly plug-and-play, restoring the reliability and performance you depend on.
Frequently Asked Questions
Do I need to do anything after installing this PCM?
Yes. While the module comes programmed to your VIN, you must perform the vehicle’s security relearn procedure (also known as VATS or Passlock). This process syncs the new PCM with your vehicle’s anti-theft system and can be done at home in about 30 minutes with no special tools.
Is this a simple plug-and-play installation?
Absolutely. Because we flash the unit with your vehicle’s specific VIN and the latest GM software updates, it eliminates the need for an expensive trip to the dealership for programming. After the security relearn, you’re ready to go.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship your order until we receive this information, as it’s essential for correct programming.
Will this fix my specific problem?
This PCM is a common solution for a wide range of engine performance, shifting, and communication issues, including many check engine light codes. However, proper vehicle diagnosis is always recommended to ensure the PCM is the root cause of your problem before ordering.
What if my original part number isn’t 12569773?
This module is a compatible replacement for a long list of interchangeable GM part numbers. As long as your vehicle (make, model, year, and engine) is on our compatibility list, this unit will be programmed to function correctly as a direct replacement.