Is Your Truck Running Unreliably? Get the Definitive Solution.
If your 2004 GMC Sierra 2500, or another compatible GM vehicle, is suffering from perplexing issues like stalling, erratic shifting, poor fuel economy, or a persistent Check Engine Light, a failing Powertrain Control Module (PCM) is often the culprit. Don’t waste time and money chasing down sensor issues. This replacement PCM, part number 12586242, is the reliable, straightforward solution to restore your vehicle’s performance and get you back on the road with confidence.
Common Symptoms & Your Solution
A faulty PCM can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following, this pre-programmed engine computer is your fix:
- Engine stalling or misfiring
- Harsh or unpredictable transmission shifting
- Failure to start or intermittent starting issues
- Poor engine performance and reduced power
- Decreased fuel efficiency
- Check Engine Light with communication error codes (U-codes) or other system faults
We take the guesswork out of the repair. Simply provide your vehicle’s VIN during checkout, and our technicians will flash this unit with the latest official GM software updates specific to your truck or SUV. This ensures seamless integration and optimal performance right out of the box. This is the most effective way to address issues related to the original 2004 Sierra 2500 PCM 12586242.
Features & Real-World Benefits
- โ VIN-Specific Programming: We flash the module to your exact vehicle, ensuring it works correctly the first time without any additional programming needs on your end.
- โ Updated GM Software: Your PCM arrives with the newest calibrations from General Motors, which can resolve factory bugs and improve overall drivability and efficiency.
- โ Direct-Fit Replacement: This unit is engineered to be a perfect physical and electronic match for the original, making installation straightforward for a DIYer or professional mechanic.
- โ Extensive Compatibility: A single, reliable solution for a wide range of 2004 GM trucks and SUVs, including Silverado, Tahoe, Suburban, Yukon, Escalade, and more.
- โ This unit is backed by our one-year replacement warranty.: Drive with the assurance that your purchase is protected.
Expert Insight: The “Brain” of Your Vehicle
Think of the PCM as the central command center for your truck. It manages everything from the fuel injectors and ignition timing to the transmission shift points and emissions systems. When it begins to fail, the signals it sends can become corrupted, causing chaos throughout the vehicle. We’ve seen countless customers replace perfectly good sensors and solenoids, only to discover the root of their problem was the PCM all along. By starting with a correctly programmed 2004 Sierra 2500 PCM 12586242, you’re not just replacing a part; you’re restoring the core logic of your vehicle’s operation.
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming before the PCM is shipped to you. It will arrive ready to be installed. All you need to do is provide us with your vehicle’s VIN at checkout.
Will I need to perform a security relearn procedure?
In most cases for these GM vehicles, a simple security relearn procedure (often called a CASE learn or Passlock relearn) is required after installation. This process syncs the new PCM with your vehicle’s anti-theft system and can typically be done in your driveway with just the key. Instructions are widely available online or in service manuals.
How do I find my part number to confirm a match?
Your original PCM will have a sticker on it with the service number. This unit replaces service number 12586242 and the other compatible numbers listed in the fitment data. As long as your vehicle is on the list, our VIN programming ensures it will be the correct module.
Where do I provide my VIN?
You can add your 17-digit Vehicle Identification Number (VIN) in the notes section at checkout or send it to us in a message after you place your order. We cannot program and ship your module without it.
What makes this a better option than a used part from a junkyard?
A used part from another vehicle will not have the correct programming for your specific VIN, options, and tire size. Our professionally programmed 2004 Sierra 2500 PCM 12586242 is loaded with the latest GM software and is verified to work, saving you from the compatibility issues and potential defects of a salvage part.