Is Your Truck or SUV Acting Up? Get Back on the Road with Confidence.
There’s nothing more frustrating than a vehicle you can’t rely on. If your 2004 GM truck or SUV is suffering from stalling, erratic shifting, a persistent check engine light, or a no-start condition, a failing Powertrain Control Module (PCM) is often the culprit. Don’t let a faulty computer keep you sidelined. This direct-replacement PCM is the definitive solution to restore your vehicle’s performance, reliability, and driveability, arriving at your door pre-programmed for a straightforward installation.
Common Symptoms & Your Solution
A failing PCM can cause a wide range of confusing issues. This module is the solution if you’re experiencing:
- Unexplained Check Engine Lights (CEL)
- Diagnostic Trouble Codes (DTCs) like P0601, P0602, P0606
- Poor engine performance, hesitation, or misfires
- Reduced fuel economy
- Harsh or unpredictable transmission shifting
- Complete no-start or intermittent starting problems
By replacing your old unit with this professionally programmed module, you are directly addressing the root cause of these electronic failures. We install the latest GM-authorized software updates, ensuring your engine and transmission operate exactly as the manufacturer intended. This is the most reliable way to fix these issues for good.
Features & Benefits
- โ VIN-Specific Programming: We flash the module with your vehicle’s exact VIN before shipping, ensuring it communicates perfectly with your truck’s specific systems and options.
- โ Plug & Play Design: This unit is designed for a simple installation. In many cases, after a security relearn procedure, you’ll be ready to go, saving you a costly trip to the dealership.
- โ Updated GM Software: Your PCM arrives with the newest calibrations from General Motors, which can solve factory bugs and improve overall performance and efficiency.
- โ Broad Compatibility: This Programmed 12586242 PCM is a direct replacement for service numbers 19299226, 89017738, and many others, covering a wide range of 2004 GM trucks and SUVs.
- โ Restored Reliability: Eliminate the guesswork and frustration of chasing electrical gremlins. Drive with the peace of mind that your vehicle’s core computer is functioning perfectly.
- โ Warranty Protection: This unit is backed by our one-year replacement warranty.
Expert Insight: The P59 Controller Advantage
The computer in your 2004 GM vehicle, often called the P59, is a sophisticated piece of hardware. Unlike older modules, it cannot simply be swapped from another vehicle. Each one is tied to the original vehicle’s VIN and option content. Our programming service isn’t just a convenience; it’s a necessity. We ensure all the correct operating parameters for your engine, transmission, and emissions equipment are loaded, preventing the compatibility errors and performance issues that plague improperly sourced modules from a salvage yard. Getting a Programmed 12586242 PCM from us is the professional-grade solution for a lasting repair.
Frequently Asked Questions
How do I provide my VIN number?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We will provide clear instructions on how to do this. We cannot program or ship your module without it.
Will I need to do anything after I install it?
Yes, in most cases you will need to perform a security relearn procedure, also known as a CASE relearn. This syncs the new PCM with your vehicle’s anti-theft system and crankshaft position sensor. This is a simple procedure that can often be done without special tools and takes about 30 minutes. We can provide instructions for this process.
Is this the correct part for my vehicle?
This Programmed 12586242 PCM fits a wide variety of 2004 GM models including the Sierra, Silverado, Tahoe, Suburban, Escalade, and more. Please check the extensive fitment list on this page and match your original part’s service number to ensure compatibility.
How long does the programming and shipping process take?
Once we receive your VIN, programming is typically completed within 1-2 business days. Shipping time will then depend on the method you select at checkout. We work quickly to get your vehicle back on the road.
What does ‘flashed with the newest updates’ mean?
It means we load the most current software version available from GM for your specific vehicle. These updates often include improvements to shifting logic, fuel efficiency, and emissions control that were developed after your truck was originally built.