Restore Peak Performance and Drive with Confidence
Is your 2004 GMC Yukon XL 1500 running rough, stalling unexpectedly, or showing a persistent Check Engine Light? These frustrating issues often point directly to a failing Powertrain Control Module. You’re not just looking for a part; you’re seeking a solution that brings back the smooth, reliable performance you depend on. This is the definitive answer—a professionally programmed PCM, part number 12586242, flashed with the latest GM software specifically for your vehicle’s VIN. Get back on the road with the peace of mind that comes from a solid, dependable repair.
Warning Signs and How to Overcome Them
A failing PCM can cause a wide range of confusing symptoms. If your vehicle is experiencing any of the following, this module is the solution you need:
- ✔ Unexplained stalling or hesitation during acceleration.
- ✔ Rough idling or poor engine performance.
- ✔ Decreased fuel economy that costs you at the pump.
- ✔ The engine won’t start, or it cranks but won’t turn over.
- ✔ Illumination of the Check Engine Light with codes like P0601, P0602, P0606, or other communication errors.
- ✔ Harsh or erratic automatic transmission shifting.
From the Shop Floor: The Case of the Confusing Trailblazer
A customer brought in a 2004 Trailblazer EXT with the 5.3L V8, a cousin to your Yukon. The complaint was maddening: it would randomly lose power on the highway, but never set a consistent code. We checked everything—fuel pressure, sensors, wiring—and found nothing. The original PCM was communicating but seemed to be making poor decisions. After installing one of our VIN-programmed modules, the change was immediate. The engine smoothed out, throttle response was crisp, and the random power loss vanished. It’s a powerful reminder that the PCM is the brain of your vehicle, and having a healthy, correctly programmed one makes all the difference.
Your Straightforward Installation Guide
Replacing your PCM is a manageable job that you can do at home with basic tools. This simple process will get your truck back to its old self in no time.
- Safety First: Always begin by disconnecting the negative terminal on your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On your Yukon XL, the PCM is typically found under the hood, on the driver’s side, under the battery tray. You will need to remove the battery to access it.
- Disconnect the Harnesses: Carefully release the locking tabs on the electrical connectors and gently pull them away from the module. Avoid forcing them.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware, as you’ll need it for the new unit.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely tighten the bolts.
- Reconnect Everything: Plug the electrical harnesses back into the new module until they click firmly into place. Reinstall and reconnect the battery.
- Final Step: In some cases, a security relearn procedure (often called a CASE relearn) may be needed. This can typically be done with a capable scan tool or by a local shop.
Tailored Fit for Your GM Ride
This module is a direct replacement for service number 12586242 and is compatible with a wide array of 2004 GM trucks and SUVs. We confirm fitment using your VIN to ensure it’s a perfect match. Compatible service numbers include: 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, YHTN. This part fits models such as:
- Cadillac Escalade, ESV, EXT
- Chevrolet Avalanche, Silverado, Suburban, Tahoe, SSR, Trailblazer EXT
- GMC Envoy XL/XUV, Sierra, Sierra Denali, Yukon, Yukon XL
- Buick Rainier
- Hummer H2
- Isuzu Ascender
By purchasing our 2004 Yukon XL PCM, you’re not just buying a part; you’re investing in a reliable, hassle-free driving experience. We handle the programming, so you can focus on the simple installation.
Frequently Asked Questions
Do I need to do any programming myself?
No. We program the module to the VIN you provide during checkout. It will arrive ready for installation, loaded with the latest GM software updates for your specific vehicle.
What is a VIN and why do you need it?
The VIN (Vehicle Identification Number) is a unique 17-digit code for your truck. It allows us to access the exact factory software and calibrations for your engine, transmission, and options, ensuring the PCM works perfectly.
Will this fix my specific problem?
This module is the definitive solution for issues caused by a faulty PCM, including many no-start conditions, performance problems, and specific internal error codes (like P0601). While it solves the most common electronic engine issues, always ensure your vehicle’s mechanical and wiring systems are in good condition.
Is this a plug-and-play part?
Yes, for the most part. After a simple physical installation, your vehicle should start and run. However, some GM vehicles may require a security or crankshaft position sensor (CASE) relearn procedure, which can be completed with a compatible scan tool.
Where do I find my vehicle’s VIN?
You can find your VIN on the driver’s side dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.