Is your 2004 GM truck or SUV suffering from frustrating and unpredictable issues? Stalling at intersections, erratic shifting, a persistent check engine light, or a complete no-start condition can all point to a failing Powertrain Control Module (PCM). Don’t let a faulty computer keep your reliable vehicle sidelined. This is the definitive, plug-and-play solution to restore your vehicle’s performance and get you back on the road with confidence. This is the correct module for your 2004 Escalade PCM 12586242 and many other GM vehicles of the same year.
Common Failure Symptoms & Your Direct Solution
A failing PCM can manifest in numerous ways, often mimicking other component failures and leading to costly, incorrect repairs. If you’re experiencing any of the following, a faulty module is the likely culprit:
- Engine stalling or cutting out intermittently
- Harsh or unpredictable automatic transmission shifting
- Failure to communicate with scan tools
- Multiple random diagnostic trouble codes (DTCs)
- Specific internal module failure codes like P0601 or P0606
- Reduced fuel economy and poor engine performance
- Complete no-start condition where the engine cranks but won’t fire
This professionally programmed PCM is the direct solution to these problems. We flash the unit with the latest GM-authorized software updates using your vehicle’s specific VIN. This ensures perfect compatibility and resolves many known factory issues, restoring the precise engine and transmission control your vehicle had when it was new.
Features & Benefits
- ✔ VIN-Programmed for Your Vehicle: Arrives ready to install, no expensive trip to the dealership for programming required. Just provide your VIN and we handle the rest.
- ✔ Plug-and-Play Installation: Simply disconnect the battery, swap the module, and reconnect. A straightforward security relearn procedure may be required, which you can easily do yourself.
- ✔ Loaded with Latest GM Updates: We flash the module with the most current software, ensuring optimal performance, fuel efficiency, and transmission function.
- ✔ Guaranteed Compatibility: A direct replacement for service numbers 12586242, 19299226, 89017738, and many others listed in the fitment guide.
- ✔ Tested for Reliability: Each module undergoes rigorous testing to ensure it meets or exceeds original equipment standards for function and durability.
- ✔ This unit is backed by our one-year replacement warranty.
A Word From The Workbench
As a technician, one of the most important first steps before condemning a PCM is to check your grounds. On these GM trucks, a corroded or loose ground strap—especially the one from the engine block to the firewall or frame—can cause all sorts of bizarre electrical gremlins that look like a bad computer. Always take a few minutes to clean and tighten all major ground connections. If your problems persist, you can be confident that this programmed PCM is the fix you need.
Frequently Asked Questions
Do I need to do anything after installing this PCM?
In most cases, you will need to perform a simple security relearn procedure. This process pairs the new PCM to your vehicle’s anti-theft system and typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. Specific instructions for your vehicle are readily available online and are easy to follow.
How do I provide my Vehicle Identification Number (VIN)?
After you complete your purchase, simply send us a message with your 17-digit VIN. We cannot program and ship your module without it, so providing it promptly ensures the fastest possible delivery.
Is this the correct part for my vehicle?
This module fits a wide range of 2004 GM trucks and SUVs. The best way to confirm is to match the service number on your current PCM to one of the numbers listed in our description, such as 12586242. If you are unsure, please contact us with your VIN and we will be happy to verify fitment for you.
What happens if I forget to send my VIN?
Your order will be placed on hold. We require your VIN to program the module correctly for your specific vehicle. We will contact you, but to avoid delays, please provide your VIN as soon as you place your order.
What is the difference between a PCM and an ECM?
The terms are often used interchangeably. ECM stands for Engine Control Module, while PCM stands for Powertrain Control Module. A PCM controls both the engine and the transmission, which is standard on most modern automatic vehicles like the ones this 2004 Escalade PCM 12586242 fits. An ECM typically only controls engine functions.