End the Guesswork and Get Back on the Road with Confidence
Is your truck or SUV plagued by a persistent check engine light, rough idling, or unpredictable shifting? A failing Powertrain Control Module (PCM) can be the hidden culprit behind a host of frustrating performance issues, turning your reliable vehicle into a source of daily stress. This isn’t just an inconvenience; it’s a matter of safety and reliability. Take back control with our fully programmed PCM, the definitive solution designed to restore your vehicle’s original performance and your peace of mind.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the complexity out of the repair by programming the module specifically to your vehicle’s unique VIN. This critical step ensures all systems communicate flawlessly, just as the factory intended. You’ll receive a unit loaded with the latest GM software updates, often resolving issues you didn’t even know were software-related. Forget expensive dealership visits and complicated programming tools—this is the direct path to a lasting fix.
Key Symptoms and Lasting Benefits
If you’re experiencing any of the following, a faulty PCM is a likely cause. Replacing it can restore your vehicle’s health and your driving enjoyment.
- ✔ Persistent Check Engine Light (CEL) with various Diagnostic Trouble Codes (DTCs) such as P0601, P0606, or communication errors like U0100.
- ✔ Unexplained drop in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine stalling, stumbling, or rough running conditions.
- ✔ Complete no-start situation where the engine cranks but won’t fire.
- ✔ Failure to pass emissions testing.
Guided Installation for a Confident Repair
You don’t need to be a master mechanic to complete this job. With basic hand tools and a little patience, you can have your vehicle running smoothly again. Follow these simple steps:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electronic work.
- Locate the Module: On most compatible trucks and SUVs, the PCM is located in the engine bay, on the driver’s side, under or next to the battery tray. On vehicles like the Trailblazer or Envoy, it’s typically next to the air filter box.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Once disconnected, unbolt the old module from its mounting bracket.
- Install the New PCM: Mount your new, pre-programmed PCM in the same location. Securely plug in all the electrical connectors, ensuring they click into place.
- Final Steps: Reconnect the negative battery terminal. The vehicle may require a security relearn procedure, which is a simple process of cycling the key. Instructions are widely available online for your specific model, or feel free to ask us!
An Old Pro’s Advice on VIN Programming
I’ve seen it a hundred times: a customer buys a used computer online, plugs it in, and… nothing. Or worse, the vehicle starts but runs terribly, with warning lights flashing everywhere. That’s because the module is still programmed for the donor vehicle’s options, security system, and emissions. VIN-specific programming isn’t a suggestion; it’s the only way to do the job right. It ensures the PCM knows exactly what it’s controlling, from your engine size to your transmission type. This pre-programming service saves you from that exact headache and a tow bill to the dealer.
Your Solution for a Faulty 2004 Sierra 2500 PCM
This module is the correct, pre-programmed replacement for a wide range of GM vehicles. By providing us with your VIN at checkout, you ensure a perfect software match, eliminating compatibility issues and getting your repair done right the first time. Regain the smooth performance and reliability you depend on every day.
Tailored Fit for Your Ride
This module is a direct replacement for service number 12586242 and is compatible with a wide array of 2004 GM models. Please verify your service number or contact us with your VIN to confirm compatibility. Models include, but are not limited to:
- Buick Rainier (5.3L)
- Cadillac Escalade, ESV, EXT
- Chevrolet Avalanche 1500, Silverado 1500/2500/3500, SSR, Suburban 1500/2500, Tahoe, Trailblazer EXT (5.3L)
- GMC Envoy XL/XUV (5.3L), Sierra 1500/2500/3500, Sierra Denali, Yukon, Yukon XL 1500/2500
- Hummer H2
- Isuzu Ascender (5.3L)
Do I need to do anything after I install this PCM?
In most cases, this is a plug-and-drive solution. However, some GM vehicles require a security relearn procedure (often called a CASE relearn or Passlock relearn). This is a simple process that typically involves cycling the ignition key and can be done without any special tools.
How do I provide my Vehicle Identification Number (VIN)?
After you complete your purchase, please send us a message with your 17-digit VIN. We cannot program and ship your module without it. You can find your VIN on your vehicle’s dashboard (driver’s side), the driver’s side door jamb sticker, or on your insurance/registration documents.
Will this fix my transmission shifting problems?
The PCM controls both engine and transmission functions. If your shifting issues are caused by faulty electronic signals or software glitches within the module, this replacement will resolve them. However, it will not fix internal mechanical failures within the transmission itself.
Is this a brand new part from the dealer?
This is a high-quality, fully tested replacement part that has been meticulously inspected and prepared to meet or exceed original factory specifications. It is programmed with the latest official GM software for your vehicle.
What if my original part number isn’t listed?
The primary service number is 12586242, but it replaces many others like YFKD, YFKF, YFKH, and more. The best way to ensure compatibility is to provide us with your VIN. We can verify the correct module for your exact vehicle configuration.