Restore Your SUV’s Performance and Reliability
Is your GMC Envoy, Chevy Trailblazer, or other GM SUV acting erratically? Frustrating issues like stalling at stoplights, harsh transmission shifts, a persistent check engine light, or a complete no-start condition often point directly to a failing Powertrain Control Module (PCM). Don’t let a faulty computer keep your trusted vehicle off the road. This professionally programmed PCM is the definitive solution to restore your engine’s performance, smooth out your transmission, and give you back the confidence you need behind the wheel.
Common Symptoms of a Failing PCM & Your Solution
A failing PCM can cause a wide range of confusing problems that can be difficult to diagnose. If you’re experiencing any of the following, this module is your answer:
- Check Engine Light: Often with communication error codes like P0601, P0602, or P0606.
- Engine Performance Issues: Rough idling, hesitation during acceleration, poor fuel economy, or random misfires.
- Transmission Problems: Inconsistent or harsh shifting, or getting stuck in one gear.
- Starting Failures: The engine cranks but won’t start, or it won’t crank at all, even with a good battery.
- Intermittent Stalling: The engine shuts off unexpectedly while driving or when coming to a stop.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take a quality, tested PCM and flash it with the latest official GM software updates specifically for your vehicle. By providing us with your Vehicle Identification Number (VIN), you ensure this Programmed 2003-2005 GMC Envoy PCM is a perfect match, eliminating the need for an expensive trip to the dealership for programming.
Features & Benefits
- ✔ VIN-Programmed for Your Vehicle: Arrives flashed to your exact VIN, ensuring perfect compatibility with your engine, transmission, and options.
- ✔ Plug-and-Drive Installation: No complicated programming tools required. Simply install the module, and you’re ready to go (a CASE relearn may be needed).
- ✔ Updated GM Software: Programmed with the newest factory updates to improve drivability, fuel efficiency, and emissions performance over the original unit.
- ✔ Solves Common Drivability Issues: The definitive fix for stalling, rough shifting, and other PCM-related headaches.
- ✔ Direct-Fit Replacement: Guaranteed compatibility for a wide range of GM SUVs, replacing part numbers 12577955, 12573576, 12574976, and more.
- ✔ This unit is backed by our one-year replacement warranty.
An Expert Tip from Our Technicians
The GM Passlock II anti-theft system in these SUVs is directly tied to the PCM. An unprogrammed or incorrectly programmed module will prevent the vehicle from starting, even if it’s the correct part number. Our VIN-specific programming service is essential because it ensures the new PCM correctly ‘handshakes’ with your vehicle’s Body Control Module (BCM) and ignition key. This crucial step is what makes for a smooth installation and saves you from a costly and inconvenient tow to the dealership.
Frequently Asked Questions
Where do I provide my Vehicle Identification Number (VIN)?
After you complete your purchase, you will need to send us your 17-digit VIN. You can typically add it as a note during checkout or send it to us in a message referencing your order number. We cannot ship your part until we receive this information.
Is this part truly ‘plug and play’?
Yes, for the most part. Because this Programmed 2003-2005 GMC Envoy PCM is flashed to your VIN, it will start and run the vehicle upon installation. However, for optimal performance and to clear certain trouble codes, a Crankshaft Variation Relearn (also known as a CASE relearn) is often required. This is a simple procedure that can be done with a capable scan tool.
How can I be sure my old PCM is the problem?
While the symptoms listed are strong indicators, it’s always best to have a qualified technician perform a full diagnostic. Common trouble codes like P0601 (Internal Control Module Memory Check Sum Error) are a definitive sign of PCM failure. A thorough diagnosis can rule out other potential issues like faulty wiring or sensors.
Will this fit my Chevy Trailblazer or Buick Rainier?
Absolutely. This PCM fits a wide range of GM SUVs built on the same platform, including the Chevrolet Trailblazer, Buick Rainier, Oldsmobile Bravada, Isuzu Ascender, and Saab 9-7X equipped with the 4.2L 6-cylinder engine. Please check the detailed fitment list on this page to confirm your specific model and year.
What is your return policy if this doesn’t fix my issue?
Because this part is custom-programmed to your specific vehicle’s VIN, it is a non-returnable item. We guarantee the module is programmed correctly and is fully functional. We strongly recommend a professional diagnosis before ordering to ensure the PCM is indeed the point of failure in your vehicle.