Is Your GM Truck Running Rough? Get Back on the Road Fast.
There’s nothing more frustrating than when your dependable workhorseโbe it a Yukon XL 2500, a Silverado, or a Sierraโstarts acting up. You’re dealing with a persistent Check Engine Light, erratic shifting, a rough idle, or even a dreaded no-start condition. In my 20+ years as a technician, I’ve seen these symptoms hundreds of times, and a faulty Powertrain Control Module (PCM) is often the culprit. The PCM is the brain of your engine and transmission, and when it fails, it can cause a cascade of confusing and costly problems.
This isn’t just another part. This is a direct-fit, reliable solution. We take a quality-tested PCM, load it with the latest official GM software updates, and program it specifically to your vehicle’s 17-digit VIN. This ensures that when it arrives, it’s ready to communicate perfectly with your truck’s specific systems, from the 6.0L V8 engine to the transmission and security features.
Common Symptoms of a Failing GM PCM
If you’re experiencing any of the following, a failing PCM is a likely cause:
- โ Unexplained Check Engine Light (CEL) with communication error codes.
- โ Harsh or delayed transmission shifting.
- โ Engine stalling, stumbling, or running rough.
- โ Complete no-start condition where the engine cranks but won’t fire.
- โ Poor fuel economy and loss of power.
- โ False sensor codes that return even after replacing the sensor.
Expert Pro Tip from a 20-Year Technician
Before you condemn your old PCM, take a close look at the connectors and the wiring harness. On these GM trucks, the PCM is located under the battery tray on the driver’s side. I’ve seen countless cases where battery acid has leaked down and corroded the terminals on the PCM connectors. This causes poor connections that mimic a complete module failure. Always disconnect the battery, remove the PCM, and thoroughly clean the pins and connector terminals with a dedicated electronics cleaner and a small brush before installing your new unit. Itโs a simple 5-minute check that can save you a major headache.
Plug-and-Play Installation for Your 2003-2006 Yukon XL PCM
Forget expensive dealership visits and programming fees. Our VIN-programmed PCM makes this a straightforward DIY job. While a security relearn procedure may be necessary (a simple process you can do in your driveway), no special scan tools are required for installation.
- Safety First: Disconnect the negative battery terminal and wait 10 minutes for the system to discharge.
- Locate the PCM: On most compatible models like the Silverado, Tahoe, and Yukon, the PCM is located under the battery on the driver’s side fender. You will need to remove the battery to access it.
- Disconnect the Old Module: Carefully unplug the electrical connectors. They have locking tabs that need to be released before pulling.
- Install the New PCM: Mount your new, pre-programmed PCM and securely reconnect the electrical harnesses. Ensure they click into place.
- Reconnect Battery: Reinstall the battery and connect the negative terminal.
- Perform Security Relearn: Start the vehicle. If it starts and dies, you’ll need to perform the GM security relearn. Simply turn the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds. Repeat this cycle 3 times, and the vehicle should start and run, having learned the new PCM.
This module is a direct replacement for service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802, and fits a wide range of GM trucks and SUVs. Please verify your vehicle in the fitment chart to ensure compatibility.
IMPORTANT: After purchase, please send us your vehicle’s VIN. We cannot ship your part until we have programmed it for you. This step is crucial for a successful, hassle-free installation.