End the Guesswork and Get Back on the Road with Confidence
Is your 2004 GMC Yukon or compatible GM truck giving you headaches? Unexplained stalling, erratic shifting, a persistent check engine light, or frustrating no-start conditions can all point to a failing Powertrain Control Module (PCM). This isn’t just an inconvenience; it’s a compromise on your vehicle’s reliability and your peace of mind. This module, part number 12586242, is the definitive solution, engineered to restore your truck’s original performance and dependability. We take the hassle out of the repair by programming it specifically to your vehicle’s VIN with the latest GM software updates before it even leaves our facility. This means a smoother installation process and the assurance that your vehicle is operating exactly as the manufacturer intended.
Warning Signs and How to Overcome Them
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 solution:
- ✔ Unexplained Check Engine Light with codes like P0601, P0602, P0606, or other communication errors.
- ✔ Rough idling, engine stalling, or hesitation during acceleration.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or unpredictable automatic transmission shifting.
- ✔ Complete failure to start, even with a good battery and starter.
- ✔ Intermittent issues with other electronic systems tied to the PCM.
Guided Installation to Restore Your Ride’s Health
Replacing your PCM is a straightforward job you can tackle with basic tools. Our pre-programmed module makes it even easier. Here’s a simple guide to get you started:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes to allow the system to fully discharge.
- Locate the Old Module: On most compatible trucks and SUVs, the PCM is found in the engine bay, on the driver’s side, often under or near the battery tray or next to the airbox.
- Disconnect and Remove: Carefully unplug the wiring harness 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, VIN-programmed PCM onto the bracket. Reconnect the wiring harnesses, ensuring they click securely into place.
- Reconnect and Start: Reattach the negative battery terminal. Your vehicle may require a security relearn procedure, which typically involves cycling the key. Consult your owner’s manual for specific steps if needed. Start the engine and enjoy the restored performance!
A Mechanic’s Note: The Trailblazer That Wouldn’t Quit Quitting
“I had a 2004 Trailblazer EXT come into the shop that was driving the owner crazy. It would stall at random red lights—no warning, no codes that stuck around. We checked fuel pressure, sensors, everything. Finally, we scoped the PCM and found the processor was dropping out intermittently. We installed one of these VIN-programmed modules, and it was like a new vehicle. The customer called a week later just to say how relieved he was to finally trust his truck again. That’s the real payoff: not just fixing a part, but restoring a driver’s confidence.”
Guaranteed Fit for Your 2004 GM Vehicle
This 2004 Yukon PCM is a direct-fit replacement for a wide range of GM trucks and SUVs. Verify your service number (found on the original module’s sticker) matches one of the following: 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, or YHTN. This part is confirmed to fit:
- Avalanche 1500 (2004)
- Cadillac Escalade, ESV, EXT (2004)
- Chevrolet Silverado 1500, 2500, 3500 (2004, Gasoline)
- Chevrolet SSR (2004)
- Chevrolet Suburban 1500, 2500 (2004)
- Chevrolet Tahoe (2004)
- Chevrolet Trailblazer EXT (2004, 5.3L)
- GMC Envoy XL, XUV (2004, 5.3L)
- GMC Sierra 1500, 2500, 3500, Denali (2004, Gasoline)
- GMC Yukon, Yukon XL 1500, Yukon XL 2500 (2004)
- Hummer H2 (2004)
- Isuzu Ascender (2004, 5.3L)
- Buick Rainier (2004, 5.3L)
Frequently Asked Questions
Do I need to do any programming myself?
No, you don’t. We handle all the programming before we ship the module. Simply provide us with your vehicle’s VIN during checkout, and we will flash the unit with the latest official GM software for your specific vehicle. It arrives ready to install.
What is a security or CASE relearn?
After installation, some GM vehicles require a simple security relearn procedure to sync the new PCM with the anti-theft system. This can usually be done without special tools by cycling the ignition key. A CASE (Crankshaft Angle Sensor Error) relearn may be needed to clear certain codes, which can be performed by most local repair shops.
Is this a plug-and-play installation?
Yes, because we program it to your VIN, it is a plug-and-play part. You simply disconnect the old module and connect the new one. No complex computer work is needed on your end.
How do I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on a plate on the driver’s side dashboard visible through the windshield.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both engine and transmission functions. If your shifting issues are caused by faulty electronic commands from the module, this new unit will resolve them and restore smooth, proper shifting.