Programmed 2008 Sierra 2500 Engine Control Module 12622141 | VIN Matched

Restore Peak Performance to Your GM Truck or Car

Is your 2008 Sierra 2500 Pickup running rough, throwing a check engine light, or suffering from mysterious electrical gremlins? You’re not just dealing with an annoyance; you’re dealing with a faulty Engine Control Module (ECM), the central computer of your vehicle. As a technician with over two decades of experience, I’ve seen firsthand how a failing ECM can cause a cascade of problems, from poor fuel economy and hesitation to a frustrating no-start condition. This isn’t a part you can afford to ignore.

This replacement Engine Control Module, part number 12622141, is the definitive solution. We take the guesswork and high costs out of the equation. Forget expensive dealership visits for programming. We flash this module with the latest official GM software updates, specifically matched to your vehicle’s VIN before it ever leaves our facility. This ensures it communicates perfectly with your truck’s existing systems, restoring the precise fuel delivery, ignition timing, and transmission shifting parameters your vehicle had when it was new.

Is Your Vehicle Showing These Symptoms?

A failing ECM can manifest in many ways. If you’re experiencing any of the following, it’s a strong indicator that the brain of your engine needs attention. This 2008 Sierra 2500 Engine Control Module is designed to correct these exact issues.

• ✔ Persistent Check Engine Light (CEL)
• ✔ Diagnostic Trouble Codes (DTCs) such as P0601, P0606, or U0100
• ✔ Unexplained drop in fuel mileage
• ✔ Engine stalling, stumbling, or hesitating
• ✔ Rough or erratic idling
• ✔ Harsh or incorrect automatic transmission shifting
• ✔ Failure to pass state emissions testing
• ✔ Complete no-start or intermittent starting problems

A Straightforward Guide to Installation

One of the biggest benefits of our pre-programmed module is the simplified installation. While professional installation is always an option, a confident DIYer can handle this job. For the 2008 Sierra 2500, the ECM is typically located in the engine bay, on the driver’s side, underneath the battery tray.

1. Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
2. Access the Module: Remove the battery and the battery tray to gain clear access to the old ECM.
3. Disconnect and Remove: Carefully unplug the electrical connectors from the old module. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket.
4. Install the New Module: Bolt the new, pre-programmed ECM into place. Reconnect the electrical connectors, ensuring they click securely into position.
5. Reassemble: Reinstall the battery tray and the battery. Reconnect the negative battery terminal.
6. Perform Security Relearn: Your vehicle now needs to recognize the new ECM. This is a simple procedure: Turn the key to the ‘ON’ position (without starting the engine) for 10-15 minutes. The ‘Security’ light on the dash should turn off. Turn the key off for 10 seconds, and then the vehicle should start and run normally.

Verified Vehicle Compatibility

This module is a direct replacement for part numbers 12622141, 12612384, and 12617568. It is guaranteed to fit a wide range of General Motors vehicles. Please confirm your specific model and engine from the list below to ensure a perfect match. Providing your VIN at checkout is essential for us to deliver a perfectly configured part for your exact vehicle.