Restore Your Truck’s Power and Reliability
Is your 2004 GMC Yukon XL 2500 acting up? Experiencing frustrating issues like stalling, a no-start condition, or a persistent Check Engine light? As a technician with over two decades of experience, I’ve seen these symptoms countless times. More often than not, the culprit is a failing Powertrain Control Module (PCM), the electronic brain of your vehicle. When it falters, it can cause chaos, from poor fuel economy to unpredictable engine behavior. This replacement PCM is the definitive solution, arriving at your door pre-programmed with the latest GM software specifically for your truck’s VIN. Forget expensive dealership visits and programming fees; this is the direct, effective fix you need to get your Yukon running like new again.
Is Your Yukon Exhibiting These PCM Failure Symptoms?
- ✔ Unexplained stalling or cutting out while driving.
- ✔ The engine cranks but refuses to start.
- ✔ A persistent Check Engine Light with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (PCM Processor Fault).
- ✔ Noticeably poor fuel mileage and sluggish performance.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication errors with your scan tool.
Case Study: A Tricky Diagnosis
I remember a 2004 Sierra 2500 with the 8.1L—same platform as your Yukon—that came into my shop. The owner had replaced plugs, wires, and even a fuel pump chasing an intermittent stall that never threw a clear code. It would run fine for days, then die at a stoplight. After hooking up my scope and monitoring the 5-volt reference signal from the PCM, I saw it drop out randomly. The PCM’s internal voltage regulator was failing under heat soak. We installed one of these VIN-programmed modules, and the truck has been running solid for over 50,000 miles since. This isn’t just a part; it’s a permanent solution that saves you from chasing ghosts in the machine.
Your Straightforward Installation Guide
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- ✔ Locate the PCM: On your 2004 Yukon XL 2500, the PCM is located on the driver’s side, in the engine bay, typically under or near the battery tray.
- ✔ Disconnect Connectors: Carefully release the locking tabs and unplug the wiring harness connectors from the old PCM. Take note of their colors or positions.
- ✔ Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s usually held in by a few 10mm bolts.
- ✔ Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely fasten the bolts.
- ✔ Reconnect Everything: Plug the wiring harnesses back into the correct sockets on the new module until they click securely. Reconnect the negative battery terminal.
- ✔ Perform Security Relearn: You may need to perform a simple security relearn procedure. Turn the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds. Repeat this cycle 3 times, and on the fourth turn, the vehicle should start.
Verified Vehicle Compatibility
This module, part number 89017739 (also replaces 12586243), is a guaranteed fit for a wide range of 2004 GM vehicles. While it’s the perfect match for your 2004 GMC Yukon XL 2500 PCM with the 8.1L engine, it also fits other models. Please provide your VIN upon purchase to ensure flawless programming. Key compatible models include:
- ✔ GMC Yukon XL 2500 & Chevy Suburban 2500 (8.1L)
- ✔ GMC Sierra & Chevy Silverado 1500/2500/3500 (Gasoline Engines)
- ✔ Chevy Avalanche 2500
- ✔ GMC Savana & Chevy Express Vans (1500/2500/3500)
- ✔ Cadillac CTS-V (2004-2005)
- ✔ Chevy Corvette & Pontiac GTO
- ✔ And many other GM trucks and SUVs from 2004.
Do I need to send my old PCM back (core charge)?
No core charge is required for this module. You can keep or responsibly recycle your old part.
Is this really plug-and-play?
Yes, it is. We program it to your vehicle’s VIN before shipping, so it’s ready to install. In some cases, a simple 30-minute security relearn procedure (as outlined in the installation guide) is needed, which requires no special tools.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive this information.
Will this fix my specific problem?
This PCM resolves issues directly caused by a faulty module, such as internal processor errors (P0601), no-start conditions, and erratic behavior. While it’s a common failure point, always ensure your vehicle has been properly diagnosed. A failing sensor can sometimes mimic PCM symptoms.
What if my part number is slightly different?
This module, 89017739, is a direct replacement for service number 12586243 and others within this family. As long as your vehicle is on the compatibility list, our VIN-based programming ensures it will function correctly.