Is Your GM Truck Running Rough? Stalling or Showing a Check Engine Light?
If you’re dealing with frustrating engine problems in your 2003-2006 Yukon, Silverado, Sierra, or another compatible GM truck, a failing Powertrain Control Module (PCM) is often the culprit. I’ve spent two decades under the hood of these vehicles, and I’ve seen firsthand how a faulty PCM can cause a cascade of issues that seem impossible to diagnose. From random stalling at intersections to harsh, unpredictable shifting, the symptoms can make your reliable truck feel untrustworthy.
This isn’t just a replacement part; it’s a complete solution. We provide a high-quality PCM, service number 28042802, that is professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN). This means it arrives at your door ready to install, loaded with the latest GM software updates to correct known factory bugs and improve performance. You get a reliable repair without the time and expense of a dealership visit.
Common Symptoms of a Failing GM PCM:
Over the years in my shop, I’ve diagnosed hundreds of these P59-style computers. The issues are almost always the same. If your truck is experiencing any of the following, a faulty PCM is a highly likely cause:
- โ Sudden stalling or cutting out while driving
- โ Complete no-start condition with power to everything else
- โ Harsh or erratic automatic transmission shifting
- โ A persistent Check Engine Light with communication codes (U-codes)
- โ Poor fuel economy and reduced engine power
- โ Inaccurate or non-functioning gauges
From the Shop Floor: A Real-World Diagnosis
A customer’s 2005 GMC Sierra 1500 came in last month with a no-start condition that had two other shops stumped. They had already replaced the fuel pump and the crankshaft position sensor. The engine would crank but never fire. After hooking up my scan tool, I noticed I couldn’t communicate with the engine controller. This is a classic sign. We confirmed power and ground at the PCM connectors were good, which pointed directly to an internal failure of the module itself. After installing one of our pre-programmed units, the truck fired up on the first try and ran perfectly. The customer saved hundreds by avoiding more guesswork.
Why a Programmed 2003-2006 Yukon PCM is a Smart Repair
The brain of your vehicle’s engine and transmission is the PCM. When it fails, nothing works correctly. Our service simplifies the repair process. By programming the module *before* we ship it, we eliminate the most complicated step. You don’t need specialized tools or a trip to the dealer for programming. This is a DIY-friendly solution that restores your vehicle’s factory functionality.
Plug-and-Play Installation: No Dealer Visit Required
Installing your new PCM is straightforward. While locations can vary slightly, it’s typically found in the engine bay. Here is a general guide for a GMC Yukon or Chevy Silverado:
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: On most of these trucks, it’s mounted to a bracket on the driver’s side, under or next to the battery and behind the headlight.
- Disconnect the Connectors: Carefully lift the locking tabs and unplug the wiring harness connectors from the old PCM. Inspect the terminals for any corrosion and clean them if necessary.
- Remove the Old Module: Unbolt the PCM from its mounting bracket.
- Install the New PCM: Mount your new, pre-programmed PCM and securely reconnect the wiring harnesses. Ensure the locking tabs click into place.
- Reconnect the Battery: Reattach the negative battery terminal. Your vehicle is now ready to start. In most cases, no further action is needed.
Guaranteed Compatibility
This module is a direct replacement for a wide array of popular GM trucks and SUVs. It is compatible with multiple service numbers, including 89017750, 12582605, 12589463, 12602802, and 89017734. Simply provide your VIN at checkout, and we’ll handle the rest, ensuring a perfect match for your vehicle’s systems.