Is Your Envoy Acting Up? Get It Back on the Road, Fast.
There’s nothing more frustrating than a reliable SUV that suddenly starts having a mind of its own. If your GMC Envoy, Chevy Trailblazer, or other GM mid-size SUV is experiencing bizarre electrical issues, stalling, poor fuel economy, or a persistent Check Engine Light, a failing Powertrain Control Module (PCM) is often the culprit. This isn’t just an inconvenience; it’s a critical component failure that can leave you stranded. This replacement engine computer is the definitive, hassle-free solution to restore your vehicle’s performance and your peace of mind.
Common Symptoms & Your Solution
A faulty PCM can manifest in numerous ways, often mimicking other sensor failures and leading to frustrating, expensive, and incorrect repairs. If you’re seeing any of these signs, it’s time to consider the brain of your engine:
- Erratic or harsh shifting from the automatic transmission
- Sudden stalling or difficulty starting, especially when warm
- Unexplained Check Engine Light with codes for multiple different sensors
- Communication error codes (U-codes)
- Poor engine performance and a noticeable drop in fuel mileage
- Vehicle won’t start at all, but the battery and starter are fine
This professionally programmed 2004 2005 Envoy XUV PCM is the direct solution to these complex problems. We take the guesswork out of the repair by flashing the unit with the latest GM software updates, specifically matched to your vehicle’s VIN. This ensures all systems communicate correctly, restoring the factory-spec performance and reliability you depend on.
Features & Benefits
- ✔ VIN-Programmed for You: Arrives ready for installation. No expensive trips to the dealership for programming are required.
- ✔ Latest GM Software: We flash the module with the most current factory updates, which can solve issues the original software didn’t.
- ✔ Plug & Play Installation: Once installed, you may only need to perform a simple security relearn procedure (instructions included), getting you back on the road quickly.
- ✔ Broad Compatibility: A direct replacement for multiple part numbers including 12573576, 12574976, 12577955, and more.
- ✔ Restored Performance: Fixes frustrating issues, improves fuel economy, and provides smooth, reliable engine operation.
Expert Insight: The GM Security Relearn Lifesaver
“As a technician, one of the biggest headaches with replacing a PCM on these GMT360 platform vehicles (Envoy, Trailblazer, etc.) is the Passlock/VATS security system. An improperly programmed or non-programmed module will prevent the vehicle from starting, period. Many DIYers get stuck here, thinking they received a bad part. Our process of pre-programming the PCM to your VIN simplifies this dramatically. In most cases, it reduces the complex dealer-level procedure to a simple ‘key-on, key-off’ sequence you can do in your driveway in about 30 minutes. We provide clear instructions to make sure the final step of the installation is as painless as the first.”
Don’t let a faulty computer dictate when and where you can drive. Investing in a properly prepared 2004 2005 Envoy XUV PCM is the most reliable and cost-effective way to solve deep-seated electronic issues and add years of life back into your trusted SUV. This is the same high-quality solution a professional shop would use to get the job done right the first time. For anyone looking for a dependable fix for their vehicle, this is the correct 2004 2005 Envoy XUV PCM to restore its function.
Frequently Asked Questions
How do I provide my VIN number?
After you complete your purchase, you will receive an email prompting you for your vehicle’s 17-digit VIN. You can also send it to us through the contact form on our website with your order number. We cannot ship your part until we receive and validate your VIN.
Is this part difficult to install?
Physically, the PCM is typically located in the engine bay and is held in by a few bolts and has several electrical connectors. The installation is straightforward for someone with basic mechanical skills. The most important step is disconnecting the vehicle’s battery before you begin. We also provide instructions for the security relearn procedure, which is required after installation.
Will I need to do anything else after installation?
In most cases, you will need to perform a security relearn procedure, which involves a sequence of turning the key on and off. This allows your vehicle’s anti-theft system to sync with the new PCM. It does not require any special tools. In some rare cases, a Crankshaft Position Sensor (CASE) relearn may be needed, which requires a compatible scan tool.
What if I have other modifications on my vehicle?
This PCM is programmed with standard factory software from GM. It is designed to work with a stock or near-stock vehicle. It is not intended for vehicles with significant performance modifications like aftermarket forced induction or internal engine changes.
Does this unit come with a warranty?
Yes, all of our programmed engine computers come with a comprehensive warranty. Please see our warranty page for the full terms and conditions, which cover programming and hardware integrity.