Is Your Envoy XL Running Rough? Get Back on the Road with Confidence.
If you’re dealing with frustrating issues like a persistent check engine light, poor fuel economy, stalling, or a no-start condition in your 2004 GMC Envoy XL, a failing Powertrain Control Module (PCM) is often the culprit. This isn’t just an inconvenience; it affects your vehicle’s reliability and your peace of mind. This replacement engine computer is the definitive, hassle-free solution to restore your vehicle’s performance and get you driving smoothly again.
Common Symptoms of a Failing PCM & Your Solution
A vehicle’s PCM is its brain, controlling everything from fuel mixture and spark timing to transmission shifting. When it fails, the symptoms can be confusing and wide-ranging. You might be experiencing:
- Erratic engine performance, such as rough idling or misfires.
- Failure to pass an emissions test.
- Poor acceleration and loss of power.
- Decreased fuel efficiency.
- Diagnostic Trouble Codes (DTCs) like P0601, P0602, or P0606.
- The engine won’t start, even with a good battery and starter.
This isn’t a part you can simply swap. Our service provides a fully programmed 2004 GMC Envoy XL 89017739 PCM, flashed with the latest official GM software updates and tailored specifically to your vehicle’s Vehicle Identification Number (VIN). This ensures a perfect match and a simple installation process.
Features & Benefits
- ✔ VIN-Programmed for Your Vehicle: No need for expensive trips to the dealership. This unit arrives pre-flashed to your specific VIN, ensuring it communicates perfectly with your Envoy’s other systems right out of the box.
- ✔ Restored Performance & Efficiency: With the latest GM software, you’ll restore the crisp throttle response, smooth shifting, and optimal fuel economy you expect from your vehicle.
- ✔ Direct-Fit Solution: This unit is a direct replacement for OEM part numbers 89017739 and 12586243, guaranteeing a perfect physical fit and correct electronic communication.
- ✔ Fixes Common Drivability Issues: Put an end to frustrating diagnostic chases. This is the core component to resolve complex electronic engine and transmission problems.
- ✔ Peace of Mind: This unit is backed by our one-year replacement warranty.
Expert Mechanic’s Note: Why VIN Programming is Non-Negotiable
“In my 20+ years turning wrenches, I’ve seen countless people buy a used computer online only to find their vehicle won’t start or the transmission shifts violently. On these GM vehicles, the PCM is tied directly to the anti-theft system (PassLock/VATS), transmission controls, and even the instrument cluster. Without programming it to your exact VIN, these systems won’t recognize each other, leading to a host of new problems. Our process of programming the 2004 GMC Envoy XL 89017739 PCM before it ships eliminates this entire headache, saving you time, money, and the stress of a vehicle that’s still broken.”
Don’t let a faulty computer keep your reliable truck off the road. By ordering this pre-programmed 2004 GMC Envoy XL 89017739 PCM, you’re not just buying a part; you’re buying a complete, ready-to-install solution that restores your vehicle’s core function and your confidence behind the wheel.
Frequently Asked Questions
Where do I provide my vehicle’s VIN?
After you complete your purchase, we will send you an email requesting your VIN. You can simply reply to that email. We cannot ship your part until we receive and validate your VIN.
Will I need to do anything after I install this PCM?
In most cases, you will need to perform a simple security relearn procedure. This can typically be done without any special tools and involves a sequence of key turns. We can provide instructions for this easy process.
Is this the correct part for my vehicle?
This module replaces part numbers 89017739 and 12586243 and fits a wide range of 2004 GM vehicles. The best way to confirm is to check the part number on your original computer. Our VIN programming process serves as a final check to ensure compatibility.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM (indicated by codes like P0601-P0606), this part will solve the problem. If the light is on for another reason, such as a faulty sensor, that issue will still need to be addressed separately.
What if I have an issue after installation?
Your purchase is protected. This unit is backed by our one-year replacement warranty. If you encounter any problems with the module itself, contact us, and we will guide you through the diagnostic and replacement process.