End the Guesswork and Get Back on the Road with Confidence
Is your Trailblazer suffering from mysterious engine problems? A persistent check engine light, rough idling, stalling, or a sudden drop in fuel economy are classic signs that the brain of your engine—the Powertrain Control Module—is failing. Don’t let a faulty computer keep you sidelined. This replacement module is your direct, reliable solution, arriving at your doorstep fully programmed to your vehicle’s specific VIN. This isn’t just a part; it’s the first step to restoring the smooth, dependable performance you rely on every day.
Warning Signs Your PCM Needs Attention
A failing engine computer can manifest in frustrating ways. If you’re experiencing any of the following, this module is the definitive fix:
- ✔ Persistent Check Engine Light: Especially with communication-related codes like P0601, P0602, or P0606.
- ✔ Engine Stalling or Misfiring: Unpredictable engine behavior that makes driving stressful and unsafe.
- ✔ Poor Fuel Economy: The engine isn’t receiving the right signals for efficient fuel delivery, costing you money at the pump.
- ✔ Failed Emissions Test: An improperly functioning PCM can’t manage your vehicle’s emissions systems correctly.
- ✔ No-Start Condition: In severe cases, the PCM can fail completely, preventing the engine from starting at all.
- ✔ Harsh or Erratic Shifting: The PCM also communicates with the transmission, and a fault can lead to poor shifting performance.
Expert Tip: The Battery Disconnect
Before you begin the installation, always disconnect the negative terminal of your vehicle’s battery. This is a non-negotiable safety step that prevents electrical shorts and allows the vehicle’s other modules to properly recognize the new PCM once it’s installed and the battery is reconnected. It’s a simple step that ensures a smooth, error-free startup.
Guided Installation to Restore Peace of Mind
You don’t need to be a master mechanic to complete this job. Because we program the module to your VIN before shipping, the process is streamlined for a straightforward installation. Follow these simple steps to get your Trailblazer running right.
- Safety First: Begin by disconnecting the negative battery terminal and securing it away from the battery post.
- Locate the Module: On your 2006 Trailblazer, the PCM is typically found in the engine bay, on the driver’s side, near the firewall.
- Disconnect the Harnesses: Carefully release the locking tabs on the electrical connectors and gently pull them straight out from the module. Never force them. Inspect the pins for any corrosion or damage.
- Remove the Old Unit: Unbolt the old PCM from its mounting bracket. It’s usually held in place by a few small bolts.
- Install the New Module: Mount your new, pre-programmed 2006 Trailblazer PCM onto the bracket and secure it with the bolts.
- Reconnect Everything: Firmly plug the electrical harnesses back into the new module until they click into place. Reconnect your negative battery terminal.
- Perform a Key Cycle: Before starting the engine, turn the key to the ‘ON’ position (without starting) for 10-15 seconds. This allows the new PCM to communicate with the vehicle’s other systems. Then, start your engine and enjoy the restored performance!
Tailored Fit for Your Ride
This module is a direct replacement for part number 12600818 and is compatible with a wide range of GM vehicles. Please verify your part number or vehicle from the list below to ensure a perfect match.
- Buick Rainier: 2006 (4.2L)
- Chevrolet Colorado: 2004-2006
- Chevrolet Trailblazer & Trailblazer EXT: 2006 (4.2L)
- GMC Canyon: 2004-2006
- GMC Envoy & Envoy XL: 2006 (4.2L)
- Hummer H3: 2006
- Isuzu Ascender: 2006 (4.2L)
- Isuzu i-280: 2006
- Isuzu i-350: 2006
- Saab 9-7x: 2006 (6 cylinder)
This unit is also a direct replacement for the following part numbers: 12569773, 12588650, 12589311, 12589585, 12591647, 12591648, 12593531, 12593532, 12594430, 12594431, 12596783, 12596784, 12597521, 12597776, 12597777, 12604438, 12604439, 12606369, 12606373, 12606374, 12606398, 12606399, 19209820, 19209821.
Your Questions, Answered
Do I need to do anything after installing this PCM?
Because this module is pre-programmed to your VIN, no further programming is typically required. In some vehicles, a security relearn procedure (often called a CASE relearn or anti-theft relearn) may be necessary. This can usually be done without special tools and instructions are widely available online or in service manuals.
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 the programming is essential for the part to function in your vehicle.
Is this a new or used part?
This is a high-quality, genuine OEM part that has been meticulously inspected, tested, and prepared to provide reliable service. It is flashed with the latest GM-certified software for your specific vehicle to ensure optimal performance.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM (e.g., internal processor error codes), then yes, this part will resolve the issue. However, it’s always best to have your vehicle scanned to ensure the codes point to a module failure and not a different sensor or component.
What if I order the wrong part?
We strongly encourage you to verify compatibility using your vehicle information and original part number. Providing your VIN for programming is our final check to ensure you receive the correct, functional 2006 Trailblazer PCM for your specific application.