Is your 2004 GM truck or SUV running rough, throwing a check engine light, or refusing to start? A faulty Engine Control Module is often the culprit behind these frustrating and unpredictable issues. Get back on the road with confidence with this direct-fit, professionally programmed Powertrain Control Module (PCM). This unit is the brain of your vehicle, and we ensure it’s ready to restore your engine’s performance right out of the box, saving you from a costly and time-consuming trip to the dealership.
Common Symptoms & Your Solution
If you’re experiencing any of the following, a failing engine computer could be to blame. This part is the definitive solution for issues such as:
- Check Engine Light (CEL) with communication error codes (e.g., P0601, P0605, P0606)
- Engine stalling or shutting off while driving
- Rough or erratic idling
- Difficulty starting or a complete no-start condition
- Poor fuel economy and reduced engine power
- Harsh or incorrect transmission shifting
Replacing your old module with this pre-programmed 12586242 PCM is the most reliable way to permanently resolve these problems and restore your vehicle’s factory performance and reliability.
Features & Benefits
- โ VIN-Programmed for Your Vehicle: We flash this computer with the latest GM-certified software using your vehicle’s specific VIN. This ensures perfect compatibility and function without any extra programming required.
- โ Simple Installation Process: Because the programming is done for you, installation is straightforward. In many cases, it’s a simple plug-and-play process, getting you back on the road faster.
- โ Restored Engine Performance: A new, correctly programmed PCM ensures your engine receives the right signals for optimal fuel delivery, ignition timing, and emissions control, bringing back the smooth and efficient operation you expect.
- โ Guaranteed Compatibility: This computer is a direct replacement for service numbers 12586242, 19299226, 89017738 and multiple broadcast codes including YFKD, YFKF, YFKH, YFXM, and more. Please see our full fitment list.
- โ Peace of Mind: This unit is backed by our one-year replacement warranty.
Expert Insight: The Critical Role of VIN Programming
As a veteran technician, I’ve seen countless drivers try to save a few dollars by grabbing a used computer from a salvage yard. The problem? That computer is programmed for a completely different vehicleโdifferent options, different security system, different transmission. This almost always results in a no-start condition or a cascade of new error codes. Our process eliminates that gamble. By flashing the 12586242 PCM with your exact VIN, we are essentially setting it to a factory-new state specifically for your truck or SUV. It’s the key to a successful and stress-free repair.
Frequently Asked Questions
What information do you need from me?
After you complete your purchase, we will need your vehicle’s 17-digit Vehicle Identification Number (VIN). This is essential for us to program the computer correctly for your specific vehicle configuration.
Is this part difficult to install?
For most 2004 GM models, the PCM is located in the engine bay (often under the battery or next to the airbox) and is held in by a few bolts. The installation involves disconnecting the battery, unplugging the electrical connectors from the old unit, swapping it with the new one, and reconnecting everything. Because our 12586242 PCM comes pre-programmed, no special tools are needed for software setup.
Will I need to have a security relearn procedure done?
In many cases with this generation of GM vehicles, a security relearn procedure (often called a CASE relearn or Passlock relearn) may be necessary after installation. This is a simple procedure that can typically be done without special tools and involves a sequence of key turns. We can provide instructions for this process.
Do I need to send my old computer back?
No core charge is required for this part. You do not need to return your old, faulty computer to us.
How do I know if this fits my vehicle?
This module fits a wide range of 2004 GM trucks and SUVs, including the Yukon, Tahoe, Silverado, Sierra, Escalade, and more. The best way to confirm is to match the service number (e.g., 12586242) on your current computer’s sticker. Please review the detailed fitment list on this page or contact us with your VIN if you are unsure.