Is Your Yukon Running Rough? Get Back on the Road Fast.
If your 2003-2006 GMC Yukon, or a related GM truck or SUV, is experiencing frustrating issues like stalling, a persistent check engine light, erratic shifting, or a complete no-start condition, a failing Powertrain Control Module (PCM) is a very likely culprit. As the central computer for your engine and transmission, its health is critical to your vehicle’s performance and reliability. Don’t let a faulty module keep you sidelined.
This is a direct-fit replacement PCM, service number 12602802, that arrives at your door fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We install the latest GM-authorized software updates, which often correct factory-known drivability issues and improve overall performance. This isn’t just a replacement; it’s a comprehensive solution.
Expert Pro Tip: Check Your Power Source
Before you condemn your old PCM, perform a simple but critical check. A weak or failing battery, or corroded battery terminals, can cause low voltage situations that mimic PCM failure. I’ve seen this in my shop countless times. Ensure your battery is fully charged and the terminals are clean and tight before installing your new module. This prevents misdiagnosis and protects your new investment from potential voltage-related damage.
Symptoms of a Failing GM PCM:
Over my 20+ years turning wrenches, these are the most common signs I’ve seen that point directly to a bad computer on these GM trucks and SUVs:
- โ Check Engine Light is on with communication error codes (like U-codes) or multiple, unrelated sensor codes.
- โ The engine cranks but refuses to start.
- โ Harsh or unpredictable automatic transmission shifting.
- โ Unexplained drops in fuel economy.
- โ Intermittent stalling or hesitation while driving.
- โ The anti-theft or security light stays illuminated.
Why Choose Our 2003-2006 Yukon PCM?
This isn’t just another part. It’s a service designed to make your repair as simple and effective as possible. A customer’s 2004 Tahoe came in last week with a no-start condition and no communication on the scan tool. After confirming good power and ground at the PCM connectors, we knew the module was dead. Instead of a costly tow to the dealer and days of waiting, this VIN-programmed module would have been the perfect one-hour, driveway fix. You get a reliable part that’s ready to go right out of the box.
Plug-and-Play Installation: No Dealer Visit Required
Installing your new PCM is straightforward. While specific steps may vary slightly by model, here is a general guide for a typical GM truck like the Yukon or Sierra:
- 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 and SUVs, the PCM is located in the engine bay, on the driver’s side, under or next to the battery tray.
- Disconnect the Connectors: Carefully unclip and remove the electrical harness connectors from the old PCM. Inspect the pins for any corrosion or damage.
- Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New PCM: Mount your new, pre-programmed PCM into the bracket and securely re-attach the electrical connectors. You should hear a distinct click.
- Reconnect and Start: Reconnect the negative battery terminal. The vehicle may require a security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes. Start the engine and verify that the check engine light is off and the vehicle runs smoothly.
This module is a direct replacement for service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802, ensuring broad compatibility across a wide range of GM vehicles. Simply provide your VIN at checkout, and we’ll handle the rest.