Is Your Yukon Running Rough, Stalling, or Refusing to Start?
If your 2009 or 2010 GMC Yukon is suddenly plagued by a check engine light, erratic engine behavior, or a complete no-start condition, a failing Engine Control Module (ECM) is a very likely culprit. As a technician with over two decades of experience under the hood, I’ve seen these symptoms countless times. Drivers come in frustrated with random misfires, poor fuel economy, or a dashboard that lights up with multiple, unrelated warning codes. These aren’t just annoyances; they’re signs that the central brain of your vehicle’s powertrain is malfunctioning, leaving you stranded and facing a costly trip to the dealership.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the hassle and high cost out of the equation. By providing us with your vehicle’s VIN at checkout, we program this ECM with the latest, most stable software updates directly from GM. This ensures it communicates perfectly with your Yukon’s specific systems—from the transmission to the anti-lock brakes—right out of the box.
The Simple Solution to Complex Engine Problems
Don’t let a faulty computer keep your truck off the road. This module is the definitive fix for a wide range of issues that often get misdiagnosed. If you’re experiencing any of the following, a new ECM is your answer:
- ✔ Unexplained Check Engine Light with communication error codes (like U-codes).
- ✔ Engine stalling, sputtering, or hesitating during acceleration.
- ✔ A complete no-start condition where the engine cranks but won’t fire up.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Transmission shifting issues or harsh engagement.
Expert Pro Tip from a 20-Year Veteran Mechanic
Before you swap out your ECM, do a quick visual inspection of the main electrical connectors. On these GM trucks, the large harness connectors for the ECM can accumulate dirt and moisture, leading to poor contact. A simple spray with an electronics-safe contact cleaner and a gentle scrub with a nylon brush can sometimes resolve intermittent communication faults. I’ve had vehicles in my shop where this simple 5-minute check saved the customer from needing a new module. It’s a crucial first step in any ECM diagnosis.
Plug-and-Play Installation: No Dealer Visit Required
One of the biggest advantages of our service is the VIN-specific programming. This means you can bypass the dealership’s expensive programming fees and long wait times. Installing your new 2009–2010 Yukon Engine Computer is a straightforward process you can do in your own driveway.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- Locate the ECM: On most 2009-2010 Yukon, Sierra, and Silverado models, the ECM is located in the engine bay on the driver’s side, near the firewall or fender.
- Disconnect the Harnesses: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. There are typically a few bolts holding it in place.
- Install the New ECM: Mount your new, pre-programmed ECM onto the bracket and secure the bolts.
- Reconnect Everything: Firmly plug the electrical harnesses back into the new module until they click into place. Reconnect your negative battery terminal.
- Perform Security Relearn: In some cases, you may need to perform a simple security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes. This allows the new ECM to sync with your vehicle’s anti-theft system. Your vehicle’s manual will have the specific steps.
Guaranteed Compatibility
This module, part number 12629009, is a direct replacement for service number 12625455 and fits a wide array of GM vehicles from 2009-2010. Please verify your part number and check the detailed fitment list to ensure this is the correct component for your vehicle. Ordering the right part, programmed correctly from the start, is the key to a successful and lasting repair.