Restore Peak Performance to Your GM SUV or Truck
Is your 2006 SAAB 9-7X, Trailblazer, or Envoy suffering from baffling electrical issues, poor performance, or a persistent Check Engine light? The Powertrain Control Module (PCM), the vehicle’s central computer, is often the root cause. When it fails, it can create a cascade of problems that are frustrating and difficult to diagnose. This replacement PCM is the definitive solution, arriving at your door fully programmed with the latest GM software updates specifically for your vehicle’s VIN. This eliminates the need for expensive dealership visits and specialized programming tools, putting the power of repair back in your hands.
Case Study: A Tricky Diagnosis
I once had a 2006 Chevy Trailblazer in my bay that was a real head-scratcher. The owner had replaced the battery, alternator, and starter, yet it still had an intermittent no-start condition with no rhyme or reason. The scan tool would sometimes show a loss of communication with the PCM (U0100) but not consistently. After verifying all power and ground circuits to the module were solid, we suspected an internal PCM failure. We installed one of our VIN-programmed modules, performed the security relearn, and the truck fired up instantly. The customer called a month later to say the problem was completely gone. It’s a classic example of how a failing PCM can mimic other component failures, costing you time and money on unnecessary parts.
Is Your Vehicle Exhibiting These PCM Failure Signs?
A failing engine computer can manifest in numerous ways. If you’re experiencing any of the following, a faulty PCM is a likely culprit. In my 20+ years of experience, these are the most common indicators I’ve seen in the shop.
- ✔ Unexplained Check Engine Light (CEL) illumination
- ✔ Diagnostic Trouble Codes (DTCs) related to internal module memory or processor errors (e.g., P0601, P0606)
- ✔ Communication loss codes with other modules (e.g., U0100, U0101)
- ✔ Engine stalling, stumbling, or rough idling
- ✔ Intermittent no-start or hard-starting conditions
- ✔ Noticeable decrease in fuel economy
- ✔ Erratic or harsh transmission shifting
- ✔ Failure to pass state emissions testing
A Straightforward Guide to Installation
Replacing the PCM on these GM platforms is a task most DIYers can handle with basic tools. The key is our pre-programming service, which makes this a true plug-and-play repair. After installation, you will need to perform a simple Security Relearn Procedure, which does not require any special tools.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most compatible models with the 4.2L engine (like the SAAB 9-7X, Trailblazer, Envoy), the PCM is located on the driver’s side of the engine block. On trucks like the Colorado and Canyon, it’s on the RH firewall.
- Disconnect Connectors: Carefully release the locking tabs and unplug the electrical wiring harnesses from the old module.
- Remove the Old Module: Unbolt the PCM from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed PCM and securely reconnect the wiring harnesses. Ensure they click into place.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn: Turn the key to the ‘ON’ position (without starting the engine) for 10-15 minutes. The security light on the dash should turn off. Turn the key off for 10 seconds, and then the vehicle should start and run normally.
Verified Vehicle Compatibility
This module is a direct replacement for a wide range of GM trucks and SUVs. We guarantee compatibility if your vehicle is listed below and your original part number is on our cross-reference list. Upon purchase, simply provide your VIN, and we’ll handle the precise software flashing.
- 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 part is compatible with the following service 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.
Do I need to have this programmed by a dealer?
Do I need to have this programmed by a dealer?
No. We program the module to your vehicle’s specific VIN before shipping. It arrives ready for installation, saving you hundreds in dealership programming fees.
What information do you need from me?
After you complete your purchase, you will need to provide us with your vehicle’s 17-digit VIN (Vehicle Identification Number). This allows us to load the correct GM-certified software for your specific vehicle configuration.
What is the ‘Security Relearn Procedure’?
It’s a simple, tool-free process that syncs the new PCM with your vehicle’s anti-theft system. Just turn the key to the ‘ON’ position for about 10-15 minutes until the security light goes out. Detailed instructions are included above.
Will this fix my specific problem?
This module will correct any issue directly caused by a faulty PCM. While it fixes a wide range of common symptoms, we always recommend a proper diagnosis to ensure the PCM is the source of the problem before purchasing.
Is this a used part?
This is a high-quality, tested component that has been inspected and prepared for service. It is flashed with new GM software and is a reliable and cost-effective alternative to a brand new module from a dealership.