Restore Peak Performance and Reliability to Your Truck
Is your GMC Envoy, Trailblazer, or Hummer H3 suffering from frustrating and unpredictable issues? A faulty Powertrain Control Module (PCM) can be the hidden culprit behind a range of problems, from a persistent check engine light and rough idling to poor fuel economy and even a no-start condition. Don’t let a failing computer keep you off the road. This replacement PCM is the definitive solution, arriving at your doorstep fully programmed to your vehicle’s specific VIN. This eliminates the need for expensive dealership programming, saving you time, money, and hassle.
Warning Signs and How to Overcome Them
If you’re experiencing any of the following, a failing PCM could be the cause. This module is designed to resolve these exact issues, restoring the smooth, dependable operation you expect.
- ✔ Check Engine Light: Constant illumination with communication codes (like U0100) or performance-related DTCs.
- ✔ Engine Performance Issues: Stalling, hesitation during acceleration, rough running, or a noticeable drop in power.
- ✔ Poor Fuel Economy: The engine isn’t receiving the correct data for an efficient air/fuel mixture, causing your truck to consume more gas.
- ✔ Erratic Transmission Shifting: The PCM plays a crucial role in controlling shift points. Hard or delayed shifts can point to a faulty module.
- ✔ No-Start Condition: The module may fail to activate the fuel pump or ignition systems, leaving you stranded.
An Expert’s Note: The Case of the Hesitant Trailblazer
I once worked with a customer who was on the verge of selling his beloved Trailblazer. He’d replaced sensors and chased electrical ghosts for weeks, trying to solve a random stalling issue that made driving in traffic a nightmare. He was frustrated and felt defeated. We traced the problem back to an intermittent failure within the original PCM. Installing a VIN-programmed module like this one was the final piece of the puzzle. The relief on his face when he called a week later to say his truck drove ‘like new’ was immense. It’s not just about replacing a part; it’s about restoring confidence and getting a vehicle you can trust back on the road.
Your Straightforward Path to a Smooth-Running Envoy
Installing your new 2006 Envoy PCM is a manageable job for a confident DIYer. We’ve taken care of the complex programming; you just need to handle the physical installation. Follow these steps for a successful repair.
- Safety First: Always begin by disconnecting the negative terminal of your vehicle’s battery. This prevents any electrical shorts and protects both you and the vehicle’s electronics.
- Locate the Old Module: On most of these GM trucks and SUVs, the PCM is located in the engine bay, often on the driver’s side near the firewall or inner fender. It’s a metal box with several large wiring harness connectors.
- Carefully Disconnect: Gently release the locking tabs on the electrical connectors and pull them straight off. Be careful not to damage the pins or the wiring. Once disconnected, unbolt the old module from its mounting bracket.
- Install the New Heart: Mount your new, pre-programmed PCM securely onto the bracket. Firmly reconnect the wiring harnesses, ensuring each one clicks into place to confirm a solid connection.
- Reconnect and Verify: Reconnect the negative battery terminal. The vehicle may need to complete a security relearn procedure (often called a ‘CASE relearn’), which can typically be done without special tools. Consult your owner’s manual or a reliable online resource for the specific steps for your model. Once complete, start the engine and enjoy a revitalized driving experience!
Guaranteed Compatibility for Your Vehicle
This module is a direct replacement for a wide range of GM vehicles and part numbers. We program it using your VIN to ensure it is a perfect match for your specific configuration. This part is engineered to fit the following models:
- 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)
This unit replaces part 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.
Frequently Asked Questions About Your New 2006 Envoy PCM
Where do I provide my vehicle’s VIN?
After you complete your purchase, you will receive instructions on how to send us your VIN. We cannot ship your part until we have this information, as the programming is specific to your exact vehicle.
Will I need to do any additional programming after installation?
In most cases, no dealership programming is needed. However, you will likely need to perform a security relearn procedure, also known as a CASE (Crankshaft Angle Sensor Error) relearn. This procedure syncs the new PCM with your vehicle’s anti-theft and sensor systems and can typically be done without any special scan tools.
Is this a new part?
This is a high-quality, OEM-grade component that has been thoroughly inspected and tested to meet or exceed original factory specifications. It is flashed with the latest GM-certified software for your vehicle.
Will this fix my check engine light?
If the check engine light is caused by a failing PCM or a related communication error, this part is the correct solution. However, if the light is on due to another faulty component (like an oxygen sensor or catalytic converter), you will still need to address that separate issue.
What if my original part number is not on your list?
Please contact us with your vehicle’s VIN and the part number from your original module. GM often has many interchangeable part numbers, and we can verify compatibility for you to ensure you get the correct component.