Is Your Yukon XL Running Rough, Stalling, or Refusing to Start?
If you’re dealing with a frustrating check engine light, erratic transmission shifting, or a no-start condition on your 2003-2006 GMC Yukon XL 2500, a failing Powertrain Control Module (PCM) is a very likely culprit. Over my 20+ years in the garage, I’ve seen hundreds of these GMT800 platform trucks exhibit the exact same issues. The PCM is the brain of your engine and transmission; when it starts to fail, it can cause a cascade of problems that can be difficult to diagnose without experience.
Common Symptoms of a Failing GM PCM:
- โ Sudden and unexplained stalling while driving or at idle.
- โ Complete no-start condition where the engine cranks but won’t fire up.
- โ Harsh or delayed transmission shifting, or getting stuck in one gear (limp mode).
- โ Multiple random trouble codes, especially communication codes (U-codes).
- โ Poor fuel economy and a noticeable loss of engine power.
- โ The security light may stay on, preventing the engine from starting.
The Direct-Fit Solution: A Pre-Programmed 2003-2006 Yukon XL 2500 PCM
Don’t let a faulty computer keep your reliable truck off the road. This is a direct-fit replacement PCM, service number 28042802, for a wide range of GM trucks and SUVs. The most critical part of this repair is the programming, and we handle that for you. Before we ship your module, our technicians will flash it with the latest GM-certified software, using the specific Vehicle Identification Number (VIN) from your truck. This ensures that all the correct parameters for your engine, transmission, and factory options are loaded, making installation a straightforward process without requiring a trip to the dealership for expensive programming.
Expert Pro Tip from a 20-Year Tech: Before you install your new PCM, take five extra minutes to inspect and clean the main ground points on the engine block and frame near the battery. On these GM trucks, a corroded or loose ground is a very common cause of PCM failure. I’ve seen countless modules get damaged by poor grounds. A simple wire brush cleaning can prevent a repeat failure and ensure your new module has a long, reliable service life.
Plug-and-Play Installation: No Dealer Visit Required
You can get your truck back to factory-spec performance right in your own driveway. Follow these simple steps to replace your PCM:
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: On most Yukon XL 2500 models, the PCM is located in the engine bay on the driver’s side, under the battery tray or next to the airbox.
- Disconnect the Harnesses: Carefully lift the locking tabs and unplug the electrical connectors from the old PCM. Inspect the pins for any corrosion or damage.
- Swap the Module: Unbolt the old PCM from its bracket and set it aside. Mount the new module securely in its place.
- Reconnect Everything: Plug the electrical harnesses firmly into the new PCM, ensuring the locking tabs click into place. Reconnect your battery terminal.
- Security Relearn (If Needed): In most cases, the vehicle will start and run perfectly. In some instances, you may need to perform a simple 10-15 minute security relearn procedure. Just turn the key to the ‘ON’ position for 10-15 minutes until the security light turns off, then turn the key off and start the engine.
Guaranteed Compatibility
This module is a direct replacement for several service numbers. If your original module has any of the following numbers, this part is the correct fit for your vehicle: 89017750, 12582605, 12589463, 12602802, 89017734, 28042802. Simply provide your VIN during checkout, and we’ll ensure you receive a perfectly matched and programmed PCM, ready for installation.