Programmed 2008 Express 3500 Engine Control Module 12622141 | VIN-Flashed

Get Your Work Van Back on the Road, Fast

If your 2008 Chevy Express 3500 is giving you headaches with a persistent check engine light, erratic shifting, stalling, or a frustrating no-start condition, the problem often points directly to a failing Engine Control Module (ECM). As the brain of your vehicle’s powertrain, a faulty ECM can disrupt everything from fuel delivery to transmission logic, making your reliable workhorse feel anything but. I’ve seen it countless times in my 20+ years as a technician: a perfectly good engine held back by a failing computer.

This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the hassle and high cost of dealership programming out of the equation. Simply provide your van’s Vehicle Identification Number (VIN) during checkout, and we will flash this module with the very latest, most stable software directly from GM. This ensures your 2008 Express 3500 Engine Control Module communicates flawlessly with all other systems in your van, restoring its original performance and reliability.

Is Your Express Van Showing These Signs?

A failing ECM can manifest in various ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs attention:

• ✔ Check Engine Light is on with codes like P0601, P0606, or other U-series communication codes.
• ✔ The engine cranks but refuses to start.
• ✔ Unexplained drop in fuel economy.
• ✔ Harsh or erratic automatic transmission shifting.
• ✔ The engine stalls unexpectedly, either at idle or while driving.
• ✔ Noticeable loss of power and poor acceleration.
• ✔ Communication issues with diagnostic scan tools.

A Straightforward Guide to Installation

Replacing the 2008 Express 3500 Engine Control Module is a job most DIYers can handle with basic tools. Our pre-programmed module makes it even simpler. For the Express/Savana vans, the ECM is typically located in the engine compartment on the driver’s side, near the rear.

1. Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes for capacitors to discharge.
2. Locate the ECM: On your Express Van, find the module in the LH rear of the engine compartment. It’s a silver box with several large electrical connectors.
3. Disconnect Connectors: Carefully unlatch and remove all electrical harness connectors from the old module. Inspect them for any corrosion or damage.
4. Remove the Old Module: Unbolt the mounting hardware holding the old ECM in place and remove it from the vehicle.
5. Install the New Module: Mount your new, pre-programmed ECM in the same location and secure it with the original hardware.
6. Reconnect Everything: Firmly plug all electrical connectors back into the new module until they click into place. Reconnect your vehicle’s battery.
7. Perform Security Relearn: In most cases, you will need to perform a security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. This allows the new ECM to sync with your vehicle’s anti-theft system. Your van may not start until this is completed.

Verified Vehicle Compatibility

This module, part number 12622141, is a direct replacement for original part numbers 12612384, 12622141, and 12617568. It is guaranteed to fit the following GM vehicles and engine configurations. Please confirm your vehicle is on this list before ordering.

Frequently Asked Questions About This ECM