Is Your Truck Running Rough, Stalling, or Refusing to Start?
A faulty Powertrain Control Module (PCM) can bring your entire operation to a halt. If you’re experiencing frustrating issues like a persistent check engine light, erratic engine behavior, poor fuel mileage, or a no-start condition, the brain of your vehicle is likely the culprit. This isn’t just an inconvenience; it’s a reliability issue that costs you time and money. Get your dependable GM truck back to factory-spec performance with this professionally programmed engine computer, designed to get you back on the road with confidence.
Common Symptoms of a Failing PCM & Your Solution
A failing computer can manifest in numerous ways. If your mechanic has diagnosed the issue or you’re seeing these signs, this is the definitive solution. This module is the correct fix for:
- Check Engine Light with communication-related Diagnostic Trouble Codes (DTCs) like P0601, P0602, P0605, or P0606.
- Vehicle is in “limp mode” with reduced power.
- Engine stalling, sputtering, or misfiring intermittently.
- Harsh or incorrect automatic transmission shifting.
- Complete no-start condition where the engine cranks but won’t fire.
This replacement 2004 Sierra 3500 PCM is meticulously prepared to be the one-and-done solution to these complex electronic problems.
Features & Benefits
- โ Plug & Play Installation: This unit arrives pre-programmed to your vehicle’s specific VIN number. No expensive trip to the dealership for flashing is required.
- โ Latest GM Software Updates: We flash your module with the newest software available from GM, ensuring optimal performance, fuel efficiency, and emissions control.
- โ Guaranteed Compatibility: This computer is a direct replacement for service numbers 12586242, 19299226, 89017738, and many others listed in our fitment guide.
- โ Restored Drivability: Eliminate the guesswork and restore the smooth idle, crisp throttle response, and reliable operation you depend on.
- โ Peace of Mind: This unit is backed by our one-year replacement warranty.
An Expert’s Note on Programming
As a veteran technician, I’ve seen countless vehicle owners waste time and money on used computers from a salvage yard. Those units are not programmed for your truck’s specific options, anti-theft system (VATS/Passlock), or emissions components. Installing one will almost always result in a no-start condition and more headaches. Our process of programming this 2004 Sierra 3500 PCM to your exact VIN is the critical step that ensures a successful and straightforward repair. We take care of the complex part so you can focus on the simple installation.
Frequently Asked Questions
What do I need to do after I purchase this PCM?
After you complete your purchase, you must provide us with your vehicle’s 17-digit VIN. We cannot program and ship the computer without it. You can add the VIN to the notes section at checkout or send it to us in a message referencing your order number.
Will I need to do any other programming after installation?
In most cases, you will need to perform a simple security relearn procedure after installation. This process syncs the new computer with your vehicle’s anti-theft system and can typically be done in your driveway without any special tools. We include instructions to guide you through it.
How can I be sure this part number fits my vehicle?
The best way to confirm is to check the service number on your current computer’s sticker. This unit replaces service numbers 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, and many others. Please review the detailed fitment list on this page to ensure your make, model, and engine are compatible.
Will this fix my check engine light?
If the check engine light is on due to an internal fault within the old PCM (like a P0601 code), then this replacement unit will solve the problem. However, if the light is on for another reason (e.g., a bad oxygen sensor), that issue will still need to be addressed separately.
Where is the PCM located on my truck?
On most 2004 GM trucks like the Sierra, Silverado, and Suburban, the PCM is located on the driver’s side of the engine bay, under the battery tray or near the airbox. Always disconnect the battery before attempting to remove or install the computer.
Take the guesswork out of your repair. By ordering this pre-programmed 2004 Sierra 3500 PCM, you’re choosing a reliable, professional-grade solution that restores your vehicle’s core function and gets you back to work.