Get Your Workhorse Back on the Job with a Reliable Engine Control Module
As a technician with over two decades of experience, I know how critical a reliable van is for your business or daily life. When your 2008 Express 3500 starts acting up—stalling, running rough, or refusing to start—it’s not just an inconvenience; it’s a major problem. Often, the culprit is a failing Engine Control Module (ECM), the brain of your vehicle’s engine. This isn’t just a replacement part; it’s a complete, ready-to-install solution for your van. We take the guesswork and the expensive trip to the dealership out of the equation. By providing your Vehicle Identification Number (VIN) at checkout, you’ll receive an ECM that is professionally programmed with the latest GM software updates specifically for your vehicle. This ensures optimal performance, fuel efficiency, and reliability right out of the box.
Is Your Van Showing These Symptoms?
A faulty ECM can cause a wide range of frustrating and hard-to-diagnose issues. If you’re experiencing any of the following, a failing module is a likely cause. In my shop, these are the classic red flags I look for when diagnosing a potential ECM failure.
- ✔ Persistent Check Engine Light with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling, especially when the engine is warm.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication errors with diagnostic scan tools.
A Technician’s Notebook
I remember a 2008 Express 3500 that came into the bay with an intermittent no-start condition that was driving the owner crazy. It was a plumber’s work van, and every time it failed to start, he was losing money. He had already replaced the battery and checked the fuel pump. The van would run fine for days, then suddenly refuse to fire up. After connecting my scanner, I noticed intermittent communication loss with the powertrain module. We inspected the wiring and found no issues. The root cause? The internal processor on the original 2008 Express 3500 Van ECM was failing under certain temperature conditions. Replacing it with a pre-programmed module like this one solved the problem permanently and got him back to work without the stress of an unreliable vehicle.
A Straightforward Guide to Installation
Installing your new ECM is a manageable job for a DIYer with basic tools. For the 2008 Express Van, the module is located in the left rear of the engine compartment. Following these steps will ensure a smooth replacement.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the ECM: On the Express Van, find the ECM mounted in the engine bay, typically on the driver’s side towards the firewall.
- Disconnect the Connectors: Carefully release the locking tabs on the electrical harness connectors and pull them straight out from the module. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the mounting hardware that secures the old ECM to its bracket. Set the old module aside.
- Install the New ECM: Mount your new, pre-programmed ECM in the same location and secure it with the original hardware.
- Reconnect Everything: Firmly plug the electrical connectors back into the new module until they click into place. Reconnect the negative battery terminal.
- Final Check: Turn the key to the ‘On’ position for 10-15 seconds before starting the engine. This allows the vehicle’s systems to recognize the new module. Start your van and check for proper operation.
Verified Vehicle Compatibility
This Engine Control Module, part number 12617568, is a direct replacement for service numbers 12612384 and 12622141. It is guaranteed to fit a wide range of General Motors vehicles. Please verify your specific model and options below.
AURA 08 3.5L (RH firewall)
CAPRICE 11 (ID 12612384)
CORVETTE 08-09 (RH engine compartment)
CTS 08 3.6L, VIN 7 (ID 12612384)
EQUINOX 08-09 3.4L (LH engine compartment)
ESCALADE / ESV / EXT 08 (LH front under battery)
EXPRESS 1500 VAN 08 5.3L (LH rear engine compartment)
EXPRESS 2500 VAN 08 Gasoline (LH rear engine compartment)
EXPRESS 3500 VAN 08 Gasoline (LH rear engine compartment)
G6 08 3.5L or 3.9L (LH front engine compartment)
HUMMER H2 08 (LH front under battery)
IMPALA 08 3.5L or 3.9L (lower part of air cleaner box)
MALIBU 08 3.5L (Classic & New Style)
SAVANA 1500 VAN 08 5.3L (LH rear engine compartment)
SAVANA 2500 VAN 08 Gasoline (LH rear engine compartment)
SAVANA 3500 VAN 08 Gasoline (LH rear engine compartment)
SIERRA 1500 PICKUP 08 (w/o 4.3L, LH front under battery)
SIERRA 2500 PICKUP 08 6.0L (LH front under battery)
SIERRA 3500 PICKUP 08 6.0L (LH front under battery)
SIERRA DENALI 08 (LH front engine compartment)
SILVERADO 1500 PICKUP 08 (w/o 4.3L, LH front under battery)
SILVERADO 2500 PICKUP 08 6.0L (LH front under battery)
SILVERADO 3500 PICKUP 08 6.0L (LH front under battery)
SUBURBAN 1500 / 2500 08 (LH front under battery)
TAHOE 08 (w/o hybrid, LH front under battery)
TORRENT 08-09 3.4L (LH engine compartment)
VUE 08-09 3.5L
YUKON / YUKON XL 1500 / YUKON XL 2500 08 (w/o hybrid, LH front under battery)
Frequently Asked Questions
Do I need to do any programming myself?
No. This module arrives at your door fully programmed to your vehicle’s VIN with the latest GM software. It is a plug-and-play solution, though some vehicles may require a security relearn procedure, which can be done without special tools.
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to access the exact factory calibration file for your specific vehicle. This ensures all systems, from the engine and transmission to the emissions equipment, function exactly as the manufacturer intended.
Is this part difficult to install?
For most individuals with basic mechanical skills, this is a straightforward installation that takes less than an hour. You will only need common hand tools to access and replace the module. See our installation guide above for more details.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the ECM (common codes P0601-P0606), then this part will resolve the issue. It is always recommended to have your vehicle properly diagnosed to confirm the ECM is the point of failure before ordering.
What if my part number is slightly different?
This module is a direct replacement for part numbers 12612384, 12622141, and 12617568. As long as your vehicle is on the compatibility list, this module will function correctly.