Restore Peak Performance to Your GM Truck or SUV
Is your 2006 GMC Envoy, Trailblazer, or other compatible GM vehicle suddenly running rough, refusing to start, or throwing a cascade of confusing check engine light codes? Before you spend a fortune at the dealership, the problem is often a failing Powertrain Control Module (PCM), the central computer of your vehicle. This replacement 2006 Envoy Powertrain Control Module is the definitive, hassle-free solution. We flash it with the latest official GM software, specifically calibrated to your vehicle’s unique VIN. This ensures perfect communication between your engine, transmission, and other systems, restoring the smooth operation and reliability you expect.
From the Diagnostic Bay: The Ghost in the Machine
I remember a 2006 Trailblazer 4.2L that came into my shop on a tow truck. The owner was frustrated; it would crank but not start, and when it occasionally did, the transmission would shift erratically and the dash lit up like a Christmas tree. He’d already replaced the battery and alternator. His scanner showed a list of communication errors (U-codes) and a dreaded P0606 (PCM Processor Fault). These symptoms, especially together, are a classic sign of an internal PCM failure. Instead of a complex and costly dealer replacement, we ordered a VIN-programmed module like this one. The installation took less than 30 minutes, and the truck fired up instantly and ran perfectly. It’s a textbook case of how the right part makes a complex problem simple.
Is Your Vehicle Exhibiting These Failure Signs?
A failing PCM can cause a wide range of issues that can be mistaken for other component failures. If you’re experiencing any of the following, your engine computer is the likely culprit:
- ✔ Check Engine Light is on with codes like P0601, P0602, P0606, or various U-codes (communication loss).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling.
- ✔ Poor fuel economy and noticeable loss of power.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Seemingly unrelated warning lights on the instrument cluster.
Your Straightforward Installation Guide
Replacing the PCM on these vehicles is a job most DIYers can handle with basic tools. The module is typically located on the driver’s side of the engine compartment.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes for the system to fully discharge.
- Locate the PCM: On the Envoy/Trailblazer platform with the 4.2L engine, the PCM is mounted to the side of the engine block on the driver’s side. On Colorado/Canyon/H3 models, it’s on the passenger side firewall.
- Disconnect Connectors: Carefully unlatch and remove the electrical wiring harness connectors from the old module. Inspect them for any corrosion or damage.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed PCM into place. Reconnect the wiring harnesses, ensuring they click securely into place.
- Final Steps: Reconnect the negative battery terminal. The vehicle is now ready to start. No further programming is required.
Verified Fitment For These GM Vehicles
This module is a direct replacement for a wide range of GM trucks and SUVs. Please verify your model and options below. 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, and 19209821.
- Buick Rainier: 2006 (4.2L)
- Chevrolet Colorado: 2004-2006
- Chevrolet Trailblazer & EXT: 2006 (4.2L)
- GMC Canyon: 2004-2006
- GMC 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)
Ordering this 2006 Envoy Powertrain Control Module is the most reliable and efficient way to get your vehicle back on the road. Simply provide your VIN at checkout, and we’ll handle the rest, shipping you a part that’s ready for immediate installation.
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to load the exact, factory-correct software from GM for your vehicle’s specific options, engine, and transmission. This ensures perfect compatibility and performance, eliminating the need for a dealer visit.
Is this part truly plug-and-play?
Yes. Because we program the module to your VIN before shipping, it arrives ready to install. In most cases, you will not need to perform any additional security relearn procedures. Just install it, connect the battery, and start your vehicle.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the old PCM (like codes P0601 or P0606), this new module will resolve the issue. However, if there are other problems with sensors or wiring, those will need to be addressed separately.
What’s the difference between a PCM and an ECM?
The terms are often used interchangeably. PCM (Powertrain Control Module) is more accurate as it typically controls both the engine and the transmission. ECM (Engine Control Module) is an older term that sometimes refers to a computer that only controls the engine. For your vehicle, this part serves as the PCM.
Do I need any special tools for installation?
No special tools are required. Basic hand tools, like a socket set and ratchet, are all you need to remove the old module and install the new one.