Restore Your Envoy’s Performance and Reliability
Is your GMC Envoy suffering from frustrating issues like a persistent check engine light, erratic shifting, or a rough idle? These are classic signs that the brain of your vehicle, the Powertrain Control Module (PCM), is failing. Don’t let a faulty computer keep you off the road. This replacement module is the definitive, hassle-free solution to bring back the smooth, dependable performance you rely on. We take the guesswork out of the equation by pre-programming this unit specifically to your vehicle’s VIN with the latest GM software updates. This ensures perfect communication between your engine and transmission, restoring factory performance and efficiency right out of the box.
Warning Signs Your PCM is Failing
A failing computer can cause a cascade of confusing problems. If you’re experiencing any of the following, this module is your solution:
- ✔ Persistent Check Engine Light: Especially for internal module error codes like P0601, P0602, P0606, or P062B.
- ✔ Poor Fuel Economy: An inefficiently running engine burns more gas than it should.
- ✔ Engine Stalling or Misfiring: The PCM controls spark and fuel timing, and errors can lead to performance drops.
- ✔ Erratic Transmission Shifting: Hard shifts, delayed engagement, or getting stuck in a gear can point to a faulty PCM.
- ✔ Vehicle Won’t Start: The module is critical for the startup sequence; if it fails, your Envoy may not start at all.
- ✔ Failed Emissions Test: Proper engine management is key to passing emissions, and a bad PCM will almost guarantee a failure.
Guided Installation for a Confident Fix
Replacing your 2006 Envoy PCM is a straightforward job you can tackle with basic hand tools. Follow these simple steps to get back on the road quickly and confidently.
- Safety First: Begin by disconnecting the negative terminal on your vehicle’s battery to prevent any electrical shorts.
- Locate the Module: On your 2006 Envoy, the PCM is typically located on the driver’s side of the engine compartment, near the firewall.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Once disconnected, unbolt the old module from its mounting bracket.
- Install the New PCM: Mount your new, pre-programmed module in the same location. Securely plug in all the electrical connectors, ensuring they click into place.
- Reconnect Power: Re-attach the negative battery terminal and tighten it.
- Final Steps: In most cases, the vehicle will start and run perfectly. Some vehicles may require a simple security relearn procedure, which involves cycling the key in the ignition. Instructions are readily available online or in your owner’s manual.
A Mechanic’s Note: The Ghost in the Machine
I once had a customer with a Trailblazer (a cousin to the Envoy) who had spent months and hundreds of dollars chasing a random misfire. He replaced plugs, coils, and even an injector, but the problem persisted. He was at his wit’s end. When he brought it to my shop, the scanner showed no hard codes, just a history of misfires. After checking all the mechanicals, I suspected the PCM. We swapped in a pre-programmed unit like this one, and the truck immediately ran like new. The old PCM was slowly failing, sending faulty signals that created a phantom problem. This part isn’t just a replacement; it’s often the cure for those frustrating, hard-to-diagnose issues.
Tailored Fit For Your Vehicle
This module is a direct-fit replacement for a wide range of GM trucks and SUVs. Please verify your model is on the list below. This unit is compatible with 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.
- 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)
By ordering this pre-programmed 2006 Envoy PCM, you’re not just buying a part—you’re investing in peace of mind and the confidence of a vehicle that runs the way it was designed to.
Frequently Asked Questions
Is this part difficult to install?
Not at all. For most DIYers with basic tools, this is a 15-20 minute job. The module is easy to access, and since we program it to your VIN, there are no complicated steps required after installation. Just plug it in, reconnect your battery, and you’re ready to go.
How do I provide my VIN for programming?
After you complete your purchase, you will receive an email prompting you for your vehicle’s 17-digit Vehicle Identification Number (VIN). You can also add it as a note during checkout. We cannot ship your part until we receive the VIN, as this step is crucial for ensuring perfect compatibility.
Will this fix my check engine light?
If your check engine light is caused by an internal failure of the existing PCM (common codes include P0601 through P0606), then this part is the correct fix. It will resolve the codes and allow the light to be turned off permanently. If the light is on for another reason, such as a faulty sensor, that issue will need to be addressed separately.
What’s the difference between a PCM, ECM, and ECU?
The terms are often used interchangeably. ECU (Electronic Control Unit) is a generic term. ECM (Engine Control Module) specifically controls engine functions. A PCM (Powertrain Control Module) is a more advanced unit that controls both the engine and the transmission, which is what this vehicle uses.
Is any additional programming needed after installation?
No. Our process of programming the module to your VIN before shipping handles all the necessary software setup. In some rare cases, a simple ‘security relearn’ or ‘CASE relearn’ may be needed, which can be done without special tools. We provide support if you have any questions during the process.