Restore Your TrailBlazer’s Performance and Reliability
Is your 2006 TrailBlazer EXT acting up? Stalling, shifting erratically, or showing a persistent Check Engine Light can be incredibly frustrating, turning your dependable SUV into a source of daily stress. These aren’t just annoyances; they’re signs that the very brain of your vehicle, the Powertrain Control Module (PCM), may be failing. This isn’t just a part—it’s the key to regaining a smooth, predictable, and safe driving experience. We offer a direct-fit, professionally programmed PCM that restores your vehicle’s factory performance and gives you back the confidence you deserve behind the wheel.
Is Your Vehicle Showing These Warning Signs?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, this module is the likely solution to get your vehicle running right again.
- ✔ Persistent Check Engine Light (CEL)
- ✔ Diagnostic Trouble Codes (DTCs) such as P0601, P0602, P0606, or U-series communication codes.
- ✔ Unexplained drop in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Complete no-start condition where the engine cranks but won’t fire up.
Guided Installation to Restore Peace of Mind
Replacing your 2006 TrailBlazer EXT PCM is a manageable job for a confident DIYer. Our goal is to make this process as smooth as possible. Your module arrives programmed to your vehicle’s VIN with the latest GM software updates, so it’s ready to go without a trip to the dealer.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the Old PCM: On your TrailBlazer, the PCM is typically found in the engine bay, on the driver’s side, near the firewall.
- Disconnect Wiring Harnesses: Carefully unclip the wiring harness connectors from the old module. These connectors have locking tabs that need to be released gently.
- Remove the Module: Unbolt the old PCM from its mounting bracket. Keep the hardware, as you may need it for the new unit.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely reconnect the wiring harnesses. Ensure they click into place.
- Reconnect the Battery: Re-attach the negative battery terminal.
- Perform Security Relearn: You will need to perform a simple key relearn procedure. Turn the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds. Repeat this cycle 3 times. On the final cycle, the vehicle should start, confirming the new module is synced.
Tailored Fit for Your Ride
This module is a direct replacement for part number 12588650 and is compatible with a wide range of GM vehicles. Please verify your vehicle is on the list below. Upon purchase, we will ask for your VIN to ensure perfect programming.
- 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 computer is also a direct replacement for the following part numbers: 12569773, 12589311, 12589585, 12591647, 12591648, 12593531, 12593532, 12594430, 12594431, 12596783, 12596784, 12597521, 12597776, 12597777, 12600818, 12604438, 12604439, 12606369, 12606373, 12606374, 12606398, 12606399, 19209820, 19209821.
Your Questions Answered
Do I need to do any programming myself?
No. We flash the module with the latest GM updates specific to your vehicle’s VIN before shipping. The only step you may need to perform is a simple security relearn procedure, which takes about 30 minutes and requires no special tools.
Is this a plug-and-play part?
Yes, because we program it to your VIN, it is a plug-and-play solution. After the security relearn, your vehicle will start and run as it should, with no need for a dealership visit for programming.
What information do you need from me?
After you complete your purchase, we will need your 17-digit Vehicle Identification Number (VIN). This allows us to load the correct software and ensure perfect compatibility with your vehicle’s specific options.
Will this fix my specific problem?
This 2006 TrailBlazer EXT PCM is the definitive solution for issues directly caused by a faulty module, such as internal processor faults (P0601) or communication errors. While it can resolve a wide range of symptoms, proper vehicle diagnosis is always recommended to rule out other potential causes like faulty sensors or wiring.
What if my original part number isn’t 12588650?
That’s okay! GM often supersedes part numbers. As long as your vehicle model and year are listed in our compatibility chart and your original part number is in our cross-reference list, this module will be the correct, updated replacement for your vehicle.