Restore Peak Performance to Your H3
Is your 2006 Hummer H3 feeling sluggish, unpredictable, or lighting up the dashboard like a holiday tree? A failing Powertrain Control Module (PCM) can be the hidden culprit behind a host of frustrating issues, from rough idling and poor fuel economy to a complete no-start condition. Don’t let a faulty computer keep your rugged H3 sidelined. This replacement PCM is your direct-fit, reliable solution to get back on the road with the confidence and performance you expect. We take the guesswork out of the repair by programming the module to your vehicle’s specific VIN before it ships, ensuring a seamless installation process.
Warning Signs and How to Overcome Them
If you’re experiencing any of the following, a faulty PCM could be to blame. This module is the key to resolving these problems for good:
- ✔ Persistent Check Engine Light (CEL) with codes like P0601, P0602, P0603, P0604, P0605, or P0606.
- ✔ Unexplained engine stalling or hesitation during acceleration.
- ✔ A noticeable drop in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The engine cranks but refuses to start.
- ✔ Communication errors with diagnostic scan tools.
A Word from a 20-Year Tech
Before you replace the module, take five minutes to check your battery terminals and the main engine ground straps. A loose or corroded connection can mimic PCM failure and cause all sorts of electrical gremlins. A clean, tight connection is the foundation of a healthy electrical system. This simple check can save you hours of diagnostic headaches.
Guided Installation for Your 2006 HUMMER H3 PCM
Replacing the brain of your vehicle sounds intimidating, but with our pre-programmed module, it’s a straightforward job you can tackle in your own driveway. Follow these steps for a confident fix:
- Safety First: Always begin by disconnecting the negative terminal of your vehicle’s battery to prevent any electrical shorts.
- Locate the Module: On your ’06 H3, the PCM is located on the right-hand (passenger) side of the firewall in the engine bay.
- Disconnect and Remove: Carefully unplug the large electrical connectors. They have locking tabs that need to be released. Once disconnected, unbolt the old module from its mounting bracket and remove it.
- Install the New Unit: Mount your new, VIN-programmed PCM securely onto the bracket. Reconnect the electrical harnesses, ensuring they click firmly into place.
- Power Up: Reconnect the negative battery terminal.
- Final Step – Security Relearn: You will need to perform a simple security relearn procedure (often called a ‘key cycle’) to sync the new PCM with your vehicle’s anti-theft system. This process typically takes about 30 minutes and instructions are readily available online or in your owner’s manual.
Tailored Fit for Your Ride
This module is a guaranteed fit for the following vehicles and part numbers. We program it with the latest GM software updates for optimal performance.
Compatible 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
Vehicle Fitment:
- 2004-2006 CHEVROLET COLORADO
- 2006 BUICK RAINIER (4.2L)
- 2006 HUMMER H3
- 2006 ISUZU ASCENDER (4.2L)
- 2006 ISUZU I-350
- 2006 CHEVROLET TRAILBLAZER (4.2L)
- 2006 CHEVROLET TRAILBLAZER EXT (4.2L)
- 2006 GMC ENVOY XL (4.2L)
- 2006 ISUZU I-280
- 2006 SAAB 9-7X (6 cylinder)
- 2004-2006 GMC CANYON
- 2006 GMC ENVOY (4.2L)
Your Questions Answered
Do I need to have this programmed by a dealer?
No! That’s the best part. We handle the programming for you before we ship the module. Simply provide us with your vehicle’s 17-digit VIN during or after checkout, and it will arrive ready for installation and a final security relearn procedure.
What is a security relearn procedure?
It’s a simple process that syncs the new PCM to your vehicle’s anti-theft system so the engine will start. It usually involves cycling the ignition key on and off in a specific sequence over about 30 minutes. This is a standard procedure for many GM vehicles and does not require special tools.
Is this a difficult part to install myself?
For most DIYers with basic hand tools, this is a very manageable job. The module is typically easy to access on the firewall. The most important parts are being careful with the electrical connectors and performing the security relearn correctly.
How do I send you my VIN?
You can add your VIN in the notes section during checkout or send it to us in a message after you complete your purchase. We cannot ship your order until we have the VIN to program the module.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both engine and transmission functions. If the module is failing, it can send incorrect signals to the transmission, causing erratic shifting. Replacing a faulty PCM often resolves these related issues.