Restore Your Hummer’s Peak Performance and Reliability
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 poor fuel economy to a no-start condition. This isn’t just an inconvenience; it’s a compromise on the rugged dependability you expect from your H3. We offer the definitive solution: a professionally programmed PCM, flashed with the latest GM software and tailored specifically to your vehicle’s VIN. This isn’t just a replacement part; it’s a restoration of your vehicle’s core intelligence, ensuring every component works in perfect harmony.
Warning Signs Your PCM Needs Attention
If you’re experiencing any of the following, it’s a strong indicator that the brain of your engine is in trouble. Replacing it can bring back the smooth, responsive drive you’ve been missing.
- ✔ Persistent Check Engine Light (CEL) that won’t go away.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0601, P0602, P0606, or other communication errors.
- ✔ Unexplained drops in fuel mileage.
- ✔ Rough or erratic idling and stalling.
- ✔ Harsh or delayed transmission shifting.
- ✔ Intermittent starting problems or a complete no-start situation.
- ✔ Failure to pass state emissions tests.
Guided Installation to Restore Peace of Mind
You don’t need to be a master mechanic to complete this repair. Our PCM comes ready to install, saving you a costly trip to the dealership. Follow these simple steps to get back on the road with confidence.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any work on the electrical system.
- Locate the Module: On your HUMMER H3, the PCM is typically found on the right-hand (passenger side) of the firewall in the engine bay.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old module. There are usually locking tabs that need to be gently released. Avoid pulling on the wires themselves.
- Remove Old PCM: Unbolt the old PCM from its mounting bracket. It’s usually held in place by a few small bolts.
- Install New PCM: Mount your new, pre-programmed PCM onto the bracket and secure it with the bolts.
- Reconnect and Secure: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect your battery terminal.
- Final Step: Start your vehicle! It may take a moment to idle smoothly as it completes its initial learning cycle. Your check engine light should be off, and performance restored.
Tailored Fit for Your 2006 HUMMER H3 PCM and More
This module is a direct-fit replacement, guaranteed to be compatible with a range of GM vehicles. Please verify your model and part number below. This unit replaces numerous part numbers, including: 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
- 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)
Your Questions, Answered
Is this module truly plug-and-play?
Yes! Because we program the module to your vehicle’s specific VIN before shipping, it is ready for installation right out of the box. No additional programming or dealer visits are required. In some rare cases, a security or crank relearn procedure may be necessary, which can be done without special tools.
How do I provide my VIN number?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship your part until we receive this information, as it is essential for the programming process.
Will this fix my specific problem or check engine light code?
This PCM is a direct solution for internal module failures, which often cause codes like P0601 (Internal Control Module Memory Check Sum Error). While it resolves a wide range of issues, we always recommend a proper diagnosis by a qualified technician to ensure the PCM is the root cause of your problem before purchasing.
What if my original part number isn’t 12594430?
No problem. This module is a compatible replacement for all the part numbers listed in the description. As long as your vehicle is on the fitment list and your original part number is mentioned, this unit will work perfectly.
What kind of guarantee comes with this part?
We stand behind our products with a comprehensive warranty. You can drive with confidence knowing that your purchase is protected against defects in workmanship and programming.