End Your Engine Troubles and Get Back to Work
Is your 2004 Chevrolet Express 3500 running rough, stalling, or refusing to start? A faulty Powertrain Control Module (PCM) is often the culprit behind these frustrating and costly issues. This isn’t just an inconvenience; it’s downtime that affects your work and your peace of mind. We provide the definitive solution: a reliable Engine Control Module, part number 12586243, that arrives at your door fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). This eliminates guesswork and the need for expensive dealership programming, getting your van back on the road where it belongs.
Common Symptoms of a Failing PCM & Your Solution
If you’re experiencing any of the following, a failing engine computer is the likely cause. This module is the correct fix for issues such as:
- Check Engine Light (CEL) is on
- Engine stalling, sputtering, or misfiring
- No-start or hard-start conditions
- Poor fuel economy
- Shifting problems with the automatic transmission
- Communication errors with diagnostic scan tools
- Error codes like P0601, P0606, or other module-related faults
By installing our precisely programmed 2004 Express 3500 PCM 12586243, you are directly addressing the root cause of these problems and restoring your vehicle’s factory performance and reliability.
Features & Benefits
- ✔ VIN-Specific Programming: We flash the module with the latest GM software updates using your VIN, ensuring it works perfectly with your vehicle’s specific configuration and options.
- ✔ Plug-and-Play Installation: Because the programming is done beforehand, you can install it without needing a trip to the dealer. In most cases, no further setup is required.
- ✔ Restored Engine Performance: A properly functioning PCM ensures optimal fuel delivery, ignition timing, and transmission control, bringing back the power and efficiency you expect.
- ✔ Cost-Effective Solution: Avoid the high costs and scheduling hassles of a dealership service department. This is a direct, affordable path to a reliable repair.
- ✔ Broad Compatibility: This module also fits a wide range of other 2004 GM trucks, vans, and SUVs. Please see the detailed fitment list to confirm compatibility.
- ✔ This unit is backed by our one-year replacement warranty.
Expert Insight: The Critical Role of Correct Programming
As a technician, I’ve seen countless vehicle owners try to save a few dollars by installing a used PCM from a salvage yard. This almost always leads to more problems. A module from another vehicle will have the wrong software and, more importantly, will not recognize your vehicle’s security system (VATS/Passlock), resulting in a no-start condition. Our process of programming the 2004 Express 3500 PCM 12586243 to your specific VIN is not just a convenience—it’s the only way to guarantee a successful and lasting repair, saving you from headaches and additional diagnostic costs.
Frequently Asked Questions
Do I need to send you my old PCM?
No, there is no core charge or need to send us your original module. This is an outright purchase, simplifying the process for you.
What information do you need from me?
After you place your order, you must provide us with your vehicle’s 17-digit VIN. We cannot program or ship the module without it. The VIN is typically found on your driver’s side dashboard (visible through the windshield) or on the door jamb sticker.
Is any additional programming needed after installation?
For most vehicles, this module is a complete plug-and-play solution. However, in some GM vehicles, a security relearn procedure (often called CASE relearn or Passlock relearn) may be required. This is a simple procedure that can typically be done without special tools and instructions can be readily found online.
How do I know this will fit my vehicle?
This module, part number 12586243, is the specified computer for a wide range of 2004 GM models. While this listing is focused on the 2004 Express 3500 PCM 12586243, please review the full compatibility list on this page. Programming to your VIN ensures it works for your specific application within that list.
What if I have questions during installation?
We are committed to your success. If you encounter any issues or have questions, our knowledgeable support team is available to assist you. Your satisfaction is our top priority.