Restore Your Vehicle’s Heartbeat and Performance
Is your truck or SUV suffering from mysterious ailments like rough idling, poor fuel economy, or an illuminated Check Engine Light that just won’t go away? These frustrating issues often point to a failing Powertrain Control Module (PCM), the central brain of your vehicle. Don’t let a faulty computer keep you off the road. This genuine GM PCM, part number 12586242, is the definitive solution to bring back the smooth, reliable performance you depend on. We take the guesswork out of the repair by flashing the module with the latest GM software, perfectly matched to your vehicle’s specific VIN. This means no expensive trips to the dealer for programming—it arrives ready to install, saving you time, money, and headaches.
Warning Signs and How to Overcome Them
A failing PCM can manifest in numerous ways, often mimicking other component failures. Recognizing these symptoms is the first step toward a confident repair. This module is the direct solution for:
- ✔ Persistent Check Engine Light with codes like P0601, P0602, P0606, or other communication errors.
- ✔ Unexplained stalling or difficulty starting the engine.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A noticeable drop in fuel efficiency.
- ✔ Failure to pass state emissions testing.
- ✔ Engine misfires or hesitation during acceleration.
Guided Installation to Restore Peace of Mind
Replacing your PCM is a straightforward job that most DIYers can handle with basic tools. Our pre-programming service makes it a true plug-and-play process. Here’s how you can get it done:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work. This prevents accidental shorts and protects the electronic systems.
- Locate the Old PCM: On most compatible models, the PCM is found in the engine bay, either on the driver’s side fender well under the battery tray or next to the airbox.
- 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 and remove it from the vehicle.
- Install the New Module: Mount your new, VIN-programmed PCM in the same location. Secure the bolts and firmly reconnect the electrical harnesses, ensuring they click into place.
- Reconnect and Verify: Reconnect the negative battery terminal. Your vehicle may require a security relearn procedure, which typically involves cycling the key. Consult your owner’s manual for the specific steps for your model. Once complete, start the engine and enjoy a restored, smooth-running vehicle.
Expert Diagnostic Tip
Before replacing your 2004 Escalade ESV PCM, take a moment to inspect your vehicle’s main battery cables and engine ground straps. A corroded or loose connection can cause voltage drops and communication errors that mimic a bad computer. A simple cleaning and tightening of these connections can sometimes resolve the issue and is a crucial step for ensuring the longevity of your new module.
Tailored Fit for Your Ride
This module is a direct-fit replacement for a wide range of 2004 GM trucks and SUVs. Please verify your original part number matches one of the following service numbers to ensure perfect compatibility:
Service Numbers: 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, YHTN
Compatible Models Include:
- 2004 Cadillac Escalade, ESV, EXT
- 2004 Chevrolet Avalanche 1500
- 2004 Chevrolet Silverado 1500, 2500, 3500 (Gasoline)
- 2004 Chevrolet Suburban 1500, 2500
- 2004 Chevrolet Tahoe
- 2004 Chevrolet SSR
- 2004 GMC Envoy XL, XUV (5.3L)
- 2004 GMC Sierra 1500, 2500, 3500 (Gasoline)
- 2004 GMC Sierra Denali
- 2004 GMC Yukon, XL 1500, XL 2500
- 2004 Hummer H2
- 2004 Buick Rainier (5.3L)
- 2004 Chevrolet Trailblazer EXT (5.3L)
- 2004 Isuzu Ascender (5.3L)
Frequently Asked Questions
Do I need to do anything after installing this PCM?
Because we program the module to your VIN, it is ready for installation. However, some GM vehicles require a simple security relearn procedure (often called a CASE relearn or anti-theft relearn) which can usually be done without special tools. Instructions are widely available online for your specific model.
How do I provide my VIN?
After you complete your purchase, simply send us a message with your vehicle’s 17-digit VIN. We cannot ship your order until we receive this information, as it’s essential for correct programming.
Is this a new or used part?
This is a high-quality, tested original equipment part that has been professionally inspected and prepared. We flash it with the most current GM-certified software to ensure it performs reliably for years to come.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both engine and transmission functions. If the computer is sending faulty signals, it can cause hard shifts, delayed engagement, or other transmission issues. Replacing a faulty 2004 Escalade ESV PCM is often the solution.
What is your warranty policy?
We stand behind our products with a comprehensive warranty. Please see the warranty tab on this listing for full details and feel confident in your purchase.