Bring Your H3 Back to Life
Is your once-unstoppable 2006 HUMMER H3 suddenly plagued by a persistent check engine light, erratic shifting, or a frustrating no-start condition? The heart of your vehicle’s performance, the Powertrain Control Module (PCM), is often the source of these confounding issues. Don’t let a faulty computer sideline your adventure. This replacement PCM, part number 12597776, is the definitive solution to restore the rugged reliability and smooth performance you expect from your H3. We take the guesswork and dealership hassle out of the equation by programming it specifically to your vehicle’s VIN before it even leaves our facility.
Signs Your PCM is Failing & The Benefits of This Solution
A failing engine computer can manifest in numerous ways, turning your dependable truck into a source of stress. Here’s how to know it’s time for a replacement and the peace of mind you’ll gain:
- âś” Check Engine Light On: Erase stubborn diagnostic trouble codes (DTCs) like P0601, P0602, or P0606, which often indicate internal module failure.
- âś” Poor Fuel Economy: A properly functioning PCM ensures optimal fuel-air mixture, restoring your H3’s efficiency.
- âś” Rough Idling or Stalling: Regain a smooth, stable engine idle and eliminate unexpected stalls that leave you stranded.
- âś” Transmission Problems: Solve issues like harsh shifting, failure to shift, or incorrect gear selection commanded by a faulty module.
- âś” Failed Emissions Test: Pass your emissions inspection with confidence, knowing your vehicle’s brain is operating precisely as the manufacturer intended.
- âś” Engine Misfires: Correct erratic signals to the ignition system, leading to a powerful and consistent engine response.
Effortless Installation for a Confident Fix
We’ve made this repair as straightforward as possible. Because we program the module to your VIN, it’s a true plug-and-drive solution. Follow these simple steps to get back on the road in under an hour.
- Safety First: Begin by disconnecting the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the Old Module: On your 2006 HUMMER 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 harnesses from the old PCM. They have locking tabs that may need to be gently pried. Once disconnected, unbolt the module from its mounting bracket.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely reconnect the wiring harnesses. You should hear a ‘click’ as they lock into place.
- Reconnect Power: Reattach the negative battery terminal and tighten it.
- Final Steps: Your vehicle is now ready to start. In some cases, a security relearn procedure may be necessary, which your vehicle’s owner’s manual can detail, but often it will start and run immediately.
An Expert’s Note: The Trailblazer That Almost Gave Up
“I remember a customer with a Trailblazer—which uses this same family of PCM—who was at his wit’s end. He’d replaced sensors and chased wires for weeks, trying to solve a bizarre transmission issue. The truck would shift perfectly when cold but would get stuck in third gear after 20 minutes of driving. He was ready to sell it for parts. We diagnosed a failing PCM that was malfunctioning as it heated up. A pre-programmed module like this one was the fix. Seeing the sheer relief on his face when he took that first worry-free drive was a powerful reminder that sometimes the most complex problems have a surprisingly simple solution.”
Guaranteed Compatibility for Your Vehicle
This module is a direct-fit replacement for a wide range of GM trucks and SUVs. Verify your vehicle is on the list below for a perfect match. This unit 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.
- HUMMER H3: 2006
- Chevrolet Colorado: 2004-2006
- GMC Canyon: 2004-2006
- Buick Rainier: 2006 (4.2L)
- Chevrolet Trailblazer & Trailblazer EXT: 2006 (4.2L)
- GMC Envoy & Envoy XL: 2006 (4.2L)
- Isuzu Ascender: 2006 (4.2L)
- Isuzu I-280: 2006
- Isuzu I-350: 2006
- Saab 9-7x: 2006 (6 cylinder)
Frequently Asked Questions
Do I need to do anything after installing this 2006 HUMMER H3 PCM?
In most cases, no. Since we program the module with your vehicle’s VIN and the latest GM software, it is designed to be a plug-and-drive installation. On rare occasions, a CASE relearn (Crankshaft Position System Variation Learning) may be needed to clear a P1336 code, which can be performed by a shop with a capable scan tool.
How do I provide my VIN number?
After you complete your purchase, you can send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive this information, as the programming is essential for it to work in your truck.
Is this a new or used part?
This is a professionally inspected and verified original equipment part that has been restored to full functionality. It is tested to meet or exceed OEM specifications and is loaded with fresh, vehicle-specific software from GM.
Will this fix my specific problem?
This PCM will correct any issue directly caused by a faulty computer. While it resolves the vast majority of electronic powertrain problems, we always recommend a proper diagnosis to ensure you’re not replacing a good part. If you have codes like P0601 (Internal Control Module Memory Check Sum Error), it is a definitive sign the PCM is the culprit.
What is the warranty on this part?
This part comes with a comprehensive warranty to give you peace of mind. Please check the warranty tab on this listing for the specific duration and terms of coverage.