Restore Peak Performance to Your 2006 GMC Envoy
Is your 2006 GMC Envoy suffering from perplexing issues like a persistent check engine light, poor fuel economy, erratic shifting, or even a no-start condition? The culprit is often a failing Powertrain Control Module (PCM), the central computer that manages your vehicle’s engine and transmission. This vital component orchestrates everything from fuel injection and ignition timing to automatic transmission shift points. When it begins to fail, it can cause a cascade of frustrating and difficult-to-diagnose problems. This replacement PCM is the definitive solution to restore your vehicle’s original performance, reliability, and drivability.
We take the guesswork and high dealership costs out of the equation. Each module is meticulously programmed with the latest official GM software updates, tailored specifically to your vehicle’s Vehicle Identification Number (VIN). This critical step ensures that the computer communicates flawlessly with all other modules in your Envoy, operating exactly as the manufacturer intended. Simply provide us with your VIN after purchase, and we will handle the complex programming before shipping the part directly to you.
From the Diagnostic Bay
We once had a 2006 Trailblazer (a sister vehicle to the Envoy with the same 4.2L engine) come into the shop with what the owner was convinced was a catastrophic transmission failure. It was shifting violently between first and second gear and occasionally refusing to shift at all. They had already received a quote for thousands of dollars for a new transmission. We hooked up our diagnostic tools and saw no internal transmission fault codes, but we did find communication errors with the PCM. On a hunch, we monitored the data stream from the PCM to the transmission control solenoids and saw erratic, nonsensical signals. Instead of a costly transmission replacement, we installed a newly programmed PCM. The ‘transmission problem’ vanished instantly. It’s a textbook example of how a faulty 2006 Envoy PCM can mimic other, more expensive mechanical failures.
Symptoms of a Failing 2006 Envoy PCM
If your vehicle is experiencing any of the following issues, a failing engine computer may be to blame. Replacing it with a properly programmed unit can resolve these problems and prevent further damage to related components.
- ✔ Check Engine Light: The check engine light is illuminated, often with communication-related fault codes (U-codes) or performance codes that don’t seem to have a clear mechanical cause.
- ✔ Engine Stalling or Misfiring: Your Envoy may stall unexpectedly while driving or at idle. You might also notice rough idling or engine misfires that aren’t resolved by replacing spark plugs or coils.
- ✔ No-Start Condition: The engine cranks but refuses to start. This can be caused by the PCM failing to command the fuel pump or ignition system to operate.
- ✔ Poor Fuel Economy: A noticeable and sudden drop in your vehicle’s gas mileage can indicate the PCM is not calculating the correct air-fuel mixture.
- ✔ Erratic Transmission Shifting: The transmission may shift harshly, slip between gears, or get stuck in one gear (limp mode). This is often misdiagnosed as an internal transmission fault.
- ✔ Failed Emissions Test: An inability to pass a smog or emissions test is a common indicator that the PCM is not managing the engine’s emissions systems correctly.
- ✔ Intermittent Electrical Issues: Seemingly random electrical problems can sometimes be traced back to a failing main computer that is sending bad data across the vehicle’s network.
Plug-and-Play Installation with VIN Programming
Our goal is to make this repair as straightforward as possible for both DIY mechanics and professional technicians. The most critical step—programming—is done by our experts before the part ever leaves our facility. By flashing the module to your specific VIN, we ensure it has the correct software calibration for your Envoy’s exact configuration, including engine, transmission, and emissions equipment. This eliminates the need for an expensive trip to the dealership for programming with a proprietary scan tool. While the module is plug-and-play, you will need to perform a simple security relearn procedure after installation, which can typically be done in your driveway without any special tools. This procedure pairs the new PCM to your vehicle’s anti-theft system.
Guaranteed Fitment for Multiple GM Models
This Powertrain Control Module is a direct replacement for a wide range of GM trucks and SUVs. Please verify your vehicle and part number from the list below to ensure compatibility. 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, 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)
Frequently Asked Questions
Do I need to do anything after I install this PCM?
Yes. While the main engine and transmission programming is complete, you will need to perform a standard GM security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating the cycle three times. This allows the new PCM to synchronize with your vehicle’s anti-theft system and ignition key. Instructions will be provided.
How do I provide my VIN?
After you complete your purchase, you will receive an email with simple instructions on where to send your 17-digit VIN. We cannot program and ship your module until we receive this information, so please provide it promptly to avoid delays.
Is this a true plug-and-play solution?
Yes, it is designed to be as close to plug-and-play as possible. Because we pre-program it to your VIN, you will not need a dealership scan tool. The only step required from you after the physical installation is the security relearn procedure mentioned above.
What if my original part number isn’t on your list?
The part numbers listed are the most common, but there can be others. As long as your vehicle is a 2006 GMC Envoy with the 4.2L engine, this module is highly likely to be the correct one. GM often supersedes part numbers. Feel free to contact us with your VIN, and we can verify the exact compatibility for you.
Does this part come with a warranty?
Absolutely. This module is backed by a comprehensive warranty against any programming or hardware defects. We stand behind our work to ensure you can purchase with complete confidence.