Restore Peak Performance to Your Workhorse Van
Is your 2008 Express 3500 Van suddenly stalling, shifting erratically, or showing a persistent Check Engine Light? As the central command center for your engine, a failing Engine Control Module (ECM) can disrupt everything from fuel delivery to ignition timing, turning your reliable work vehicle into a source of frustration. This isn’t just an inconvenience; it’s a direct hit to your productivity. This replacement ECM, part number 12612384, is the definitive solution to restore your van’s factory performance and reliability.
We take the guesswork and high costs out of the repair process. Unlike a blank module from a dealership that requires expensive programming, this unit arrives at your door fully programmed with the latest GM software updates, specifically tailored to your van’s Vehicle Identification Number (VIN). This ensures seamless integration with your vehicle’s existing systems, providing a dependable, long-term fix.
A Technician’s Notebook: The Intermittent No-Start
I remember a 2008 Express 3500 from a local delivery company that came into my shop with a baffling issue. The driver reported that it would randomly refuse to start, but only after it had been running for a while and sat for about 30 minutes. There were no consistent trouble codes, just a generic communication error that would pop up occasionally. We checked the battery, starter, and fuel pressureâall perfect. On a hunch, after letting the van run to operating temperature, I used a heat gun to gently warm the ECM. Sure enough, the next attempt to start was a no-go. The internal circuits of the original ECM were failing under thermal stress, a common point of failure I’ve seen in dozens of these modules. Replacing it with a properly programmed unit like this one solved the problem instantly, getting their van back in service the same day.
Is Your Express Van Showing These Signs of ECM Failure?
A failing computer can cause a wide range of symptoms. If you’re experiencing any of the following, a faulty 2008 Express 3500 Van ECM is a likely culprit:
- â Unexplained Check Engine Light illumination
- â Engine stalling, stumbling, or hesitating during acceleration
- â Noticeable decrease in fuel economy
- â Harsh or erratic automatic transmission shifting
- â Complete no-start or intermittent starting problems
- â Diagnostic Trouble Codes (DTCs) such as P0601, P0606, or U0100 stored in memory
A Straightforward Guide to Installation
This module is designed for a direct-fit replacement. With basic hand tools, you can have your van running smoothly again. For the 2008 Express Van, the ECM is typically located in the engine compartment on the driver’s side.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- Locate the ECM: On the Express Van, find the module in the LH rear of the engine compartment. It will have several large electrical connectors attached.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs that must be released. Once disconnected, unbolt the module from its mounting bracket and remove it.
- Install the New Module: Mount the new, pre-programmed ECM in the same location. Secure the bolts and then firmly reconnect the wiring harnesses, ensuring they click into place.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn: A security relearn procedure may be necessary for the vehicle to start. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. After this, the vehicle should start and run correctly. A CASE (Crankshaft Angle Sensor Error) relearn with a capable scan tool is also recommended for optimal performance.
Verified Compatibility for GM Vehicles
This ECM is a direct replacement for part numbers 12612384, 12622141, and 12617568 and fits a wide array of GM vehicles. While this listing is for a 2008 Express 3500 Van ECM, please confirm your part number and vehicle in the list below.
AVALANCHE 1500 08 Electronic Control Module; (LH front under battery)
CAPRICE 11 Electronic Control Module; ID 12612384
CORVETTE 08-09 Electronic Control Module; (RH engine compartment)
CTS 08 Electronic Control Module; (RH front engine compartment), 3.6L, VIN 7, ID 12612384
EQUINOX 08-09 Electronic Control Module; (LH engine compartment), 3.4L
ESCALADE / ESV / EXT 08 Electronic Control Module; (LH front under battery)
EXPRESS 1500 VAN 08 Electronic Control Module; (LH rear engine compartment), 5.3L
EXPRESS 2500 VAN 08 Electronic Control Module; (LH rear engine compartment), gasoline
HUMMER H2 08 Electronic Control Module; (LH front under battery)
IMPALA 08 Electronic Control Module; (lower part of air cleaner box), 3.5L or 3.9L
SAVANA 1500 VAN 08 Electronic Control Module; (LH rear engine compartment), 5.3L
SAVANA 2500 VAN 08 Electronic Control Module; (LH rear engine compartment), gasoline
SAVANA 3500 VAN 08 Electronic Control Module; (LH rear engine compartment), gasoline
SIERRA 1500 / DENALI 08 Electronic Control Module; (LH front under battery/engine compartment), w/o 4.3L
SIERRA 2500 / 3500 PICKUP 08 Electronic Control Module; (LH front under battery), 6.0L
SILVERADO 1500 PICKUP 08 Electronic Control Module; (LH front under battery), w/o 4.3L
SILVERADO 2500 / 3500 PICKUP 08 Electronic Control Module; (LH front under battery), 6.0L
SUBURBAN 1500 / 2500 08 Electronic Control Module; (LH front under battery)
TAHOE 08 Electronic Control Module; (LH front under battery), w/o hybrid option
YUKON / YUKON XL 1500 / YUKON XL 2500 08 Electronic Control Module; (LH front under battery), w/o hybrid option
…and other models listed in the original fitment data.
Frequently Asked Questions
How does the programming process work?
After you complete your purchase, you will need to provide us with your vehicle’s 17-digit VIN. We use this number to access the latest official GM software for your specific vehicle configuration. We flash the module before shipping, so it arrives ready for installation without needing a trip to the dealer.
Do I need any special tools for the installation?
For the physical swap, you only need basic hand tools like a socket set to remove the module’s mounting bolts. While the vehicle may start and run after the security relearn, we highly recommend having a capable scan tool to perform a CASE relearn to ensure the most accurate crankshaft position data for optimal engine timing and performance.
Is this a new or used part?
This is a high-quality, inspected, and tested recycled OEM part. Each module is verified to be fully functional before being programmed with your vehicle’s specific software. This provides OEM reliability at a significant cost saving compared to a new part from the dealership.
Will this fix my transmission shifting problems?
In many GM vehicles, the ECM and Transmission Control Module (TCM) work together. If the ECM is sending incorrect data (like engine load or speed), it can absolutely cause poor shifting. If your transmission issues are accompanied by other engine-related symptoms, replacing the ECM is a very likely fix.
What is your warranty policy?
We stand behind our products with a comprehensive warranty. Please refer to the warranty section of our website for specific details and duration, ensuring you have peace of mind with your purchase.