Is your vehicle running rough, stalling, or showing engine error codes?
A failing Powertrain Control Module (PCM) is often the culprit behind frustrating and hard-to-diagnose engine problems. If your 2004 Buick Rainier, GMC Envoy, Chevy Silverado, or other compatible GM truck or SUV is experiencing erratic behavior, poor fuel economy, or won’t start at all, you’ve found the reliable solution. This is a genuine GM PCM, service number 12586242, professionally programmed with the latest factory software to match your vehicle’s specific VIN. Restore your vehicle’s original performance and dependability without an expensive trip to the dealership.
Common Symptoms & Your Solution
A faulty PCM can cause a wide range of issues. You might be seeing a check engine light with Diagnostic Trouble Codes (DTCs) like P0601, P0602, P0606, or other communication errors. Other common symptoms include:
- Engine stalling or misfiring
- Harsh or failed shifting
- No-start or intermittent starting conditions
- Reduced engine power and acceleration
- Poor fuel mileage
- Failure to pass emissions testing
This pre-programmed module is the definitive fix for these problems. By providing us with your VIN at checkout, you ensure that the 2004 Buick Rainier PCM you receive is a perfect electronic match for your vehicle’s specific configuration, making installation straightforward.
Features & Benefits
- ✔ VIN-Programmed for Your Vehicle: Arrives ready to install with the latest GM software for your specific truck or SUV. No extra programming required.
- ✔ Plug-and-Play Installation: Simply disconnect the battery, swap the modules, and reconnect. In most cases, no complicated relearn procedures are needed.
- ✔ Restores Original Performance: Corrects issues with fuel delivery, ignition timing, and transmission shifting to bring back the smooth, reliable operation you expect.
- ✔ Cost-Effective Solution: Get the right part, programmed correctly, without the high costs and scheduling hassles of a dealership service center.
- ✔ Broad GM Compatibility: Direct replacement for service numbers 12586242, 19299226, 89017738 and many others across a wide range of 2004 GM trucks and SUVs.
- ✔ Backed by a Solid Warranty: This unit is backed by our one-year replacement warranty.
An Expert’s Note on Programming
As a technician with over two decades of experience, I’ve seen countless issues arise from improperly matched control modules. A generic, unprogrammed unit from a salvage yard might seem like a cheap fix, but it can lead to a cascade of new problems—from transmission failures to anti-theft system lockouts. Our process eliminates that risk. We flash this 2004 Buick Rainier PCM with your vehicle’s unique VIN data, ensuring every parameter, from engine size to transmission type, is perfectly aligned. This is the key to a successful and lasting repair.
Frequently Asked Questions
Is this module difficult to install?
For most DIYers with basic tools, this is a straightforward installation. The module is typically located in the engine bay, often near the battery or airbox. The process involves disconnecting the vehicle’s battery, unplugging the electrical connectors from the old module, removing it, and installing the new one in its place. Once installed, reconnect the battery. It’s a true plug-and-play solution.
Do I need to send my old computer (core) back?
No core charge or return is required for this part. You can keep your old module.
How do I provide my VIN?
After completing your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive the VIN, as the programming is specific to your vehicle.
Is this a brand new part?
This is a high-quality, genuine GM replacement part that has been professionally programmed and tested to ensure it meets or exceeds original factory specifications. It is guaranteed to function correctly in your vehicle.
How can I be sure this fits my vehicle?
This module fits a wide range of 2004 GM trucks and SUVs. The best way to confirm compatibility is to match the service number (e.g., 12586242) on your original computer to the numbers listed in our description. If you are unsure, please contact us with your VIN before ordering.