Programmed 2006 Trailblazer EXT PCM 19209821 | VIN Matched Engine Computer

Restore Your Trailblazer’s Reliability and Performance

Is your 2006 Trailblazer EXT acting up? Maybe it’s stalling at stoplights, shifting erratically, or refusing to start altogether. As a technician with over two decades of diagnostic experience, I’ve seen these exact issues countless times, and they often point directly to a failing Powertrain Control Module (PCM). This isn’t just an inconvenience; it’s a critical failure that compromises your vehicle’s performance and safety. Don’t let a faulty engine computer keep you sidelined. This is the direct, reliable solution you need to get your truck running like new again.

This isn’t just a generic part off a shelf. We provide a professionally programmed PCM, flashed with the latest official GM software updates specific to your vehicle. The process is simple: after your purchase, you provide us with your Vehicle Identification Number (VIN), and we handle the rest. This critical step ensures that when the module arrives, it’s ready to communicate perfectly with your Trailblazer’s other systems—the transmission controller, the anti-lock brakes, and more. This eliminates the need for an expensive trip to the dealership for programming, saving you both time and money. This is the same process we use in the shop to guarantee a successful repair on the first try.

Is Your Trailblazer Showing These Telltale Signs?

A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, there’s a strong chance your engine computer is the culprit.

• ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (PCM Processor Fault).
• ✔ Your vehicle cranks but refuses to start.
• ✔ The engine stalls unexpectedly, either while driving or at idle.
• ✔ Noticeable decrease in fuel economy and poor engine performance.
• ✔ Harsh or erratic automatic transmission shifting.
• ✔ Communication errors with your scan tool or other vehicle modules.
• ✔ Intermittent issues that seem to have no logical cause.

DIY-Friendly Installation: A Step-by-Step Guide

Replacing the PCM on your Trailblazer is a straightforward job that most DIYers can handle in their own driveway. Our pre-programmed module makes it even easier.

1. Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes for the system capacitors to discharge.
2. Locate the PCM: On your 2006 Trailblazer with the 4.2L engine, the PCM is located on the driver’s side of the engine bay, near the firewall.
3. Disconnect the Connectors: Carefully unclip and remove the electrical harness connectors from the old PCM. Inspect them for any corrosion or damage.
4. Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s typically held in place by a few small bolts.
5. Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely fasten the bolts.
6. Reconnect Everything: Plug the electrical connectors firmly into the new module. Reconnect your vehicle’s negative battery terminal.
7. Perform Security Relearn: You will need to perform a simple key-on/key-off security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. This allows the anti-theft system to recognize the new PCM. Your vehicle will not start until this is completed.

Verified Fitment for Your GM Vehicle

This Powertrain Control Module is a direct replacement for a wide range of GM trucks and SUVs. It is guaranteed to fit and function correctly in the following vehicles, replacing part numbers such as 12597521, 12606374, and more.

• 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 & i-350: 2006
• Saab 9-7x: 2006 (6-Cylinder)