Restore Peak Performance to Your GM Truck or SUV
Is your 2004 GMC Yukon XL 1500, or another compatible GM vehicle, suffering from perplexing issues like a persistent check engine light, rough idling, stalling, or poor fuel economy? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that manages your vehicle’s engine and transmission. This replacement PCM, service number 12586242, is the definitive solution to restore your vehicle’s original performance, reliability, and drivability.
The PCM is the brain of your vehicle’s operation. It constantly analyzes data from sensors throughout the engine and drivetrain to make real-time adjustments to the fuel mixture, ignition timing, and transmission shift points. When it fails, the entire system can become unstable, leading to a frustrating and potentially unsafe driving experience. Don’t let a faulty computer keep your truck off the road. This unit is a direct-fit replacement, professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN) with the latest software updates from General Motors.
From the Diagnostic Bay
We recently had a 2004 Silverado 2500 in the shop that was driving its owner crazy. It would randomly lose power and stall, but only after it was fully warmed up. There were no consistent trouble codes, just a generic communication error that would pop up occasionally. After hours of checking wiring harnesses and sensors, we hooked up a diagnostic scope to the PCM’s main power and ground circuits. We discovered intermittent voltage drops inside the module itself as it heated up. Swapping in a VIN-programmed PCM like this one solved the problem on the first test drive. Sometimes, the issue is deep within the vehicle’s brain.
Symptoms of a Failing 2004 Yukon XL 1500 PCM
If you’re experiencing any of the following issues, a failing engine computer could be the culprit. This module is the correct component to address these common problems and get your vehicle running smoothly again.
- ✔ Persistent Check Engine Light (CEL)
- ✔ Engine stalling or cutting out unexpectedly
- ✔ Rough or erratic idling
- ✔ Noticeable decrease in fuel mileage
- ✔ Harsh, delayed, or incorrect transmission shifting
- ✔ Failure to pass emissions testing
- ✔ Complete no-start condition where the engine cranks but won’t fire
- ✔ Communication errors with a diagnostic scan tool
Plug-and-Play Installation with VIN Programming
Eliminate the guesswork and costly trips to the dealership. We take the complexity out of the repair by pre-programming this PCM to your truck’s exact VIN. This ensures that all factory settings, including engine and transmission parameters and anti-theft system (Passlock/VATS) information, are correctly configured before it even ships. The result is a simple, plug-and-play installation. Simply disconnect the battery, swap the old module with the new one, reconnect the battery, and you’re ready to go. A security relearn procedure may be required, which is a simple process that can be done without any special tools.
This PCM is a direct replacement for service number 12586242 and is also compatible with a wide range of other service numbers, including 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN. It fits an extensive list of 2004 GM vehicles such as the Sierra, Silverado, Tahoe, Suburban, Escalade, Envoy, Trailblazer, and more. Please verify your part number or consult the fitment list to ensure compatibility.
Frequently Asked Questions
Why do I need to provide my VIN?
Your Vehicle Identification Number (VIN) contains critical information about your vehicle’s specific options, engine, transmission, and emissions equipment. We use the VIN to load the exact GM-certified software onto the PCM, ensuring it functions perfectly with your truck, right out of the box.
Is this part difficult to install?
No, the physical installation is straightforward for anyone with basic mechanical skills. The PCM is typically located in the engine bay (on the driver’s side, under the battery tray or near the airbox). Because we program it beforehand, you avoid the need for expensive dealer-specific programming tools, making this a DIY-friendly repair.
Will this PCM require any additional programming after installation?
In most cases, no additional programming is needed. The unit is sent with all the necessary engine and transmission software. You may need to perform a simple security relearn procedure (often called a VATS relearn), which involves a sequence of key turns and waiting periods. Instructions for this are readily available and do not require a scan tool.
How do I confirm this is the correct part for my vehicle?
The best way to confirm is by matching the service number on your current PCM to 12586242 or one of the other compatible numbers listed. You can also use the detailed fitment list provided to find your specific make, model, and engine size.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM, then yes, this part will resolve the issue. However, the check engine light can be triggered by many other components, such as faulty sensors or wiring. It is always recommended to have the trouble codes read by a diagnostic scanner to help pinpoint the root cause of the problem.