Restore Peak Performance to Your GM Truck or SUV
Is your 2004 Suburban 2500 suffering from baffling issues like erratic shifting, poor fuel economy, a persistent check engine light, or even a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM). Don’t let a faulty computer keep your reliable workhorse off the road. This replacement PCM, part number 12586242, is the definitive solution to get your vehicle running like it just rolled off the factory floor. We take the guesswork and hassle out of the repair by pre-programming the module to your vehicle’s specific VIN, ensuring a seamless, plug-and-play installation.
Signs Your Engine Computer Needs Attention
A failing PCM can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following, this module is your likely solution:
- ✔ Unexplained Check Engine Light with codes like P0601, P0606, or other communication errors.
- ✔ Harsh or delayed transmission shifting.
- ✔ A sudden, noticeable drop in fuel mileage.
- ✔ Engine stalling, stumbling, or misfiring.
- ✔ The vehicle cranks but refuses to start.
- ✔ Communication issues with diagnostic scan tools.
Guided Installation to Restore Peace of Mind
Replacing the PCM is a straightforward job you can tackle with basic hand tools, saving you a costly trip to the dealership. Our pre-programming service means no additional flashing is required. Just install it and go!
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical mishaps.
- Locate the Old Module: On most GM trucks like the Suburban, the PCM is found in the engine bay, on the driver’s side, often under or next to the battery tray.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket.
- Install the New PCM: Mount your new, pre-programmed 2004 Suburban 2500 PCM in the same location. Securely reconnect all electrical harnesses, ensuring they click into place.
- Final Steps: Reconnect the negative battery terminal. The vehicle may need to go through a security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes. Start the engine and enjoy a smooth, responsive drive!
Mechanic’s Insight: Check Your Grounds!
Before condemning your old PCM, take a moment to inspect the main battery cables and engine ground straps. On these GM platforms, a corroded or loose ground connection can cause bizarre electrical symptoms that perfectly mimic a failed computer. A few minutes with a wire brush can sometimes save you hundreds of dollars. Ensuring clean, tight connections is crucial for the longevity of your new module.
Guaranteed Fitment for Your 2004 GM Vehicle
This module is a direct replacement for service numbers 12586242, 19299226, 89017738 and various broadcast codes including YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN. It is confirmed to fit the following 2004 models:
- Buick Rainier (5.3L)
- Cadillac Escalade, ESV, EXT
- Chevrolet Avalanche 1500
- Chevrolet Silverado 1500, 2500, 3500 (Gasoline Engines)
- Chevrolet SSR
- Chevrolet Suburban 1500, 2500 (Gasoline Engines)
- Chevrolet Tahoe
- Chevrolet Trailblazer EXT (5.3L)
- GMC Envoy XL, XUV (5.3L)
- GMC Sierra 1500, 2500, 3500 (Gasoline Engines)
- GMC Sierra Denali
- GMC Yukon, Yukon XL 1500, Yukon XL 2500
- Hummer H2
- Isuzu Ascender (5.3L)
Upon purchase, simply provide us with your VIN. We’ll handle the programming with the latest GM updates, ensuring your new 2004 Suburban 2500 PCM is perfectly matched to your vehicle’s factory specifications. This is the key to a successful, lasting repair and the confidence that comes with a dependable vehicle.
Frequently Asked Questions
Do I need to do anything after installing this PCM?
In most cases, no. Because we program the module to your VIN, it’s ready to go. Some vehicles may require a simple security relearn procedure (often called a ‘CASE relearn’ or ‘crankshaft variation relearn’), which can be done with a capable scan tool or by following a specific key-cycle procedure. Instructions can be easily found for your specific model.
Is this a brand new part?
This is a high-quality, fully tested replacement part that meets or exceeds original equipment specifications. It has been meticulously inspected and prepared to provide reliable, long-term service for your vehicle.
Where do I provide my VIN?
After you complete your purchase, you can send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship the module until we receive your VIN, as the programming is specific to your vehicle.
Will this fix my transmission shifting problems?
Yes, in many cases it will. The PCM controls both engine and transmission functions. If the computer is sending faulty signals, it can cause hard shifting, slipping, or incorrect gear selection. A properly programmed PCM restores the correct communication, often resolving these issues.
What if I have modifications on my vehicle?
This module is programmed with the latest stock calibration from General Motors for your specific VIN. It is designed for vehicles with original factory equipment and settings. It is not intended for vehicles with significant performance modifications.