Is Your 2006 GMC Envoy Running Rough?
If you’re dealing with frustrating issues like a persistent check engine light, stalling, poor fuel mileage, or erratic transmission shifting, a failing Powertrain Control Module (PCM) is often the culprit. The PCM is the brain of your vehicle, controlling everything from fuel injection and ignition timing to transmission shift points. When it starts to fail, it can cause a cascade of problems that are difficult to diagnose. This replacement module is the definitive solution to restore your vehicle’s performance and reliability.
This isn’t just a generic part off a shelf. We provide a fully programmed 2006 Envoy PCM specific to your vehicle. Before shipping, we flash the unit with the latest GM-certified software updates using the VIN you provide. This critical step ensures that the module communicates perfectly with your engine, transmission, and all other onboard systems, making for a seamless installation process without the need for an expensive trip to the dealership.
From the Diagnostic Bay
We had a 2006 Trailblazer (the Envoy’s sibling) come into the shop with a list of bizarre, intermittent symptoms. The owner complained of random stalling at stoplights, occasional hard shifts, and a check engine light that would come and go. We checked everything—sensors, wiring, fuel pressure—and couldn’t find a consistent fault. After hours of diagnostics, we hooked up a scope to the PCM’s main processor. We found intermittent voltage drops and data corruption, classic signs of an internal module failure. We installed a VIN-programmed PCM just like this one, and the truck ran perfectly. It’s a great reminder that sometimes the most complex-seeming problems have a straightforward solution: a reliable, correctly programmed control module.
Symptoms of a Failing 2006 Envoy PCM
- ✔ Persistent Check Engine Light (CEL) illuminated on your dash.
- ✔ Engine stalling, sputtering, or running rough, especially at idle.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or delayed transmission shifting.
- ✔ Vehicle entering ‘limp mode’ with reduced power.
- ✔ No-start or intermittent starting conditions.
- ✔ Communication error codes when using a diagnostic scan tool (e.g., U-codes).
- ✔ False sensor codes that return even after replacing the sensor.
Plug-and-Play Solution for Your GM Truck or SUV
This module is a direct replacement for a wide range of GM vehicles, including the GMC Envoy, Chevy Trailblazer, Chevy Colorado, GMC Canyon, Hummer H3, and more. It is a direct fit for numerous original equipment part numbers, including 12591648, 12569773, 12588650, 12597521, and others listed in the fitment data. By programming the module to your VIN, we ensure it has the correct calibration for your vehicle’s specific engine, transmission, and options package. In most cases, installation is as simple as disconnecting the battery, swapping the old module for the new one, and reconnecting the battery. Some vehicles may require a simple security relearn procedure, which can be performed without any special tools.
Frequently Asked Questions
Is this module ready to install when I receive it?
Yes! This module comes fully programmed to the Vehicle Identification Number (VIN) you provide during checkout. This means it’s ready for installation right out of the box, with no additional programming required by a dealer.
What information do you need from me?
We only need your vehicle’s 17-digit VIN to load the correct GM software and calibration files. You can typically find your VIN on your driver’s side dashboard (visible through the windshield), on your door jamb sticker, or on your vehicle’s registration and insurance documents.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM or a related internal processor error, this part will resolve the issue. However, it’s crucial to ensure you have properly diagnosed the problem. This module will not fix issues caused by faulty sensors, wiring, or other mechanical components.
Do I need to have my old module repaired?
No, this is a complete replacement unit. You do not need to send us your old module. You simply install this one in its place.
What is the difference between a PCM and an ECM?
The terms are often used interchangeably. ECM stands for Engine Control Module, while PCM stands for Powertrain Control Module. A PCM is a more advanced type of ECM that controls both the engine and the transmission functions, which is standard on most modern vehicles like your 2006 Envoy.