Is Your Truck Running Rough?
The Powertrain Control Module, or PCM, is the central command center for your 2006 GMC Envoy XL’s engine and transmission. When it begins to fail, it can cause a cascade of confusing and frustrating problems, from a simple check engine light to a vehicle that won’t start at all. If you’re experiencing erratic engine behavior, poor fuel economy, or inconsistent shifting, a faulty PCM is a likely culprit. This isn’t just an inconvenience; a failing module can leave you stranded and lead to damage to other components if left unaddressed.
From the Diagnostic Bay
We had a 2006 Trailblazer (which uses the same platform as the Envoy) come into the shop with a complaint of intermittent stalling at stoplights. The customer had already replaced the battery and alternator with no luck. We scanned the system and found a few generic communication error codes, but nothing specific. After monitoring live data, we noticed the fuel trim and ignition timing values would suddenly drop out just before a stall. This pointed us directly to the brain of the operation. We installed a correctly programmed PCM, and the problem was solved instantly. It’s a perfect example of how the right module, programmed correctly, is the key to fixing these ghost-in-the-machine issues.
Common Symptoms of a Failing 2006 Envoy XL PCM
- ✔ Check Engine Light is illuminated with various trouble codes (DTCs).
- ✔ Engine stalls unexpectedly or struggles to start.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Rough or erratic engine idling.
- ✔ Harsh or delayed automatic transmission shifting.
- ✔ The vehicle enters a ‘limp mode’ with reduced power.
- ✔ Complete no-start condition where the engine cranks but won’t turn over.
The Direct-Fit, Programmed Solution
Don’t let a bad computer keep your reliable GM truck off the road. This Powertrain Control Module is a direct replacement for part number 12569773 and a wide range of other compatible part numbers. The most critical part of the process is the programming, and we handle that for you. Before we ship your part, we use your vehicle’s unique Vehicle Identification Number (VIN) to flash the module with the latest, most stable software updates directly from GM. This ensures that once you receive it, the module is ready to communicate perfectly with all the other systems in your vehicle. This eliminates the need for an expensive trip to the dealership for programming, saving you time and money.
This module is a guaranteed fit for a variety of GM vehicles, including the 2006 GMC Envoy, Envoy XL, Chevy Trailblazer, Buick Rainier, Hummer H3, Saab 9-7X, and more equipped with the 4.2L inline-6 engine. Please verify your part number or contact us to ensure compatibility.
Frequently Asked Questions
Do I need to program this module?
No. This module comes pre-programmed to your vehicle’s specific VIN. Simply provide us with your VIN during or after checkout, and we will flash the computer with the latest GM software before shipping it. This makes the installation process much simpler.
What is a PCM and what does it do?
The PCM, or Powertrain Control Module, is your vehicle’s main computer. It controls all aspects of engine and transmission function, including fuel injection, ignition timing, emissions systems, and shift points, to ensure optimal performance, efficiency, and reliability.
Will this fix my check engine light?
If the check engine light is on due to a faulty module, then replacing it with this correctly programmed unit should resolve the issue. However, it’s always recommended to have the codes scanned by a professional to confirm the PCM is the root cause of the problem.
Is any additional setup required after installation?
In many cases, this is a plug-and-play installation. However, some vehicles may require a security or CASE relearn procedure to be performed with a compatible scan tool after the new PCM is installed. This syncs the new module with your vehicle’s anti-theft and crankshaft position sensor systems.
Where is the PCM located on my 2006 Envoy XL?
On the 2006 GMC Envoy XL with the 4.2L engine, the Powertrain Control Module is typically located in the engine bay, on the driver’s side (LH engine), attached to the inner fender or firewall.