End the Frustration of a Failing Engine Computer
Is your GMC Envoy, Trailblazer, or Hummer H3 suddenly running rough, stalling, or showing a persistent Check Engine Light? These frustrating issues often point to a failing Powertrain Control Module (PCM), the vital brain of your vehicle. Don’t let unpredictable performance ruin your day or leave you stranded. This direct-fit, professionally programmed engine computer is the definitive solution to restore your vehicle’s performance, reliability, and your peace of mind.
We take the guesswork out of the repair. Simply provide your vehicle’s VIN during checkout, and our experts will flash this module with the latest GM-certified software specific to your 2006 Envoy. This means it arrives at your door ready for a straightforward installation, eliminating the need for expensive dealership programming or specialized tools. Get back to a smooth, confident drive you can depend on.
Warning Signs and How to Overcome Them
A faulty PCM can manifest in numerous ways. If you’re experiencing any of the following, this module is the solution you need:
- ✔ Persistent Check Engine Light (CEL) with codes like P0601, P0602, P0606, or other communication errors.
- ✔ Unexplained drops in fuel economy.
- ✔ Rough or erratic idling and stalling.
- ✔ Harsh or delayed transmission shifting.
- ✔ The engine cranks but refuses to start.
- ✔ Failure to pass state emissions testing.
Installing this pre-programmed module resolves these core issues, restoring factory-level engine performance, crisp shifting, and optimal fuel efficiency.
An Expert’s Note on Post-Installation Procedures
“After 20 years of turning wrenches, I’ve seen it all. One thing many DIYers miss with these GM vehicles is the ‘Crankshaft Variation Relearn’ or ‘CASE Relearn.’ After you install your new 2006 Envoy PCM, the engine may run, but you might get a P1336 code. This is normal! The new computer needs to learn the precise position of your crankshaft sensor. Most mid-range scan tools have this function, or a local shop can perform it in minutes. It’s a small final step that ensures a perfect, code-free repair and a smooth-running engine for years to come.”
Effortless Steps for a Confident Fix
You don’t need to be a master mechanic to complete this job. With basic hand tools and a little patience, you can have your vehicle running right in no time. Follow these guided steps:
- Safety First: Always begin by disconnecting the negative terminal on your vehicle’s battery. This prevents any electrical shorts during the process.
- Locate the Module: On most compatible vehicles like the Envoy or Trailblazer, the PCM is 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 PCM onto the bracket and securely reconnect the wiring harnesses. You’ll hear a ‘click’ when they are properly seated.
- Power Up: Reconnect the negative battery terminal. The installation is now complete. It’s recommended to perform the security and CASE relearn procedures for optimal function.
Tailored Fit for Your Ride
This module is a direct replacement for part number 12606373 and is guaranteed to be compatible with the following vehicles. We program it specifically for your VIN to ensure perfect communication with your vehicle’s systems.
- Buick Rainier: 2006 (4.2L)
- Chevrolet Colorado: 2004-2006
- GMC Canyon: 2004-2006
- GMC Envoy: 2006 (4.2L)
- 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)
- Chevrolet Trailblazer: 2006 (4.2L)
- Chevrolet Trailblazer EXT: 2006 (4.2L)
This unit replaces a wide range of original part numbers, including: 12569773, 12588650, 12589311, 12591647, 12597521, 12606369, and many more.
Frequently Asked Questions
What exactly does a PCM do?
The Powertrain Control Module, or PCM, is the central computer for your vehicle. It manages everything from fuel injection and ignition timing to transmission shifting and emissions controls to ensure the engine runs efficiently and powerfully.
How do I provide my VIN for programming?
It’s easy! After you complete your purchase, you will receive an email with instructions on where to send your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive this information, as the programming is essential.
Is this a difficult part to install myself?
For most DIYers with basic tools, this is a very manageable job. The module is typically easy to access in the engine bay, and since we pre-program it, the physical swap is straightforward. The most important part is ensuring the battery is disconnected before you begin.
Will I need to do anything after installing the new module?
In many cases, you may need to perform a simple ‘Security Relearn’ procedure, which involves cycling the key in the ignition. Additionally, a ‘Crankshaft Variation Relearn’ (CASE Relearn) is highly recommended to prevent certain trouble codes and ensure the smoothest operation. Many affordable scan tools can perform this function, or any local mechanic can do it quickly.
What if my original part number isn’t on the list?
The part numbers listed are the most common, but this module replaces many others. As long as your vehicle’s make, model, and year are listed in our compatibility chart, we can program this module for your vehicle. The VIN-specific programming ensures it works perfectly.