Is Your 2008 Savana 3500 Running Rough or Stalling?
As the central command center for your vehicle’s engine, the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), is critical for optimal performance, fuel economy, and emissions. When it begins to fail, it can cause a wide range of frustrating and difficult-to-diagnose issues. From a persistent Check Engine Light to intermittent stalling or a complete no-start condition, a faulty ECM can bring your workhorse van to a grinding halt. This replacement Engine Control Module, part number 12622141, is the definitive solution to restore your vehicle’s factory performance and reliability.
From the Diagnostic Bay
We had a 2008 Savana 3500 work van come into the shop that was a nightmare for its owner, a local contractor. The van would randomly stall at traffic lights and occasionally refuse to start in the morning, costing him time and money. He had already replaced the fuel pump and crankshaft position sensor with no success. After hooking up our diagnostic scanner, we noticed erratic data from multiple sensors and communication dropouts with the ECM. We swapped in a new, correctly programmed module, and the van fired up instantly and ran perfectly. The issue wasn’t the individual parts; it was the computer controlling them. A correctly programmed ECM was the key to getting him back on the road reliably.
Common Symptoms of a Failing ECM
- ✔ Check Engine Light is illuminated, often with communication-related error codes (U-codes).
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Other warning lights on the dashboard may illuminate unexpectedly.
- ✔ Failure to pass state emissions testing.
Why Choose Our Programmed 2008 Savana 3500 Engine Control Module?
This isn’t just a generic, off-the-shelf part. We provide a comprehensive, plug-and-play solution tailored specifically to your vehicle. The key is our professional programming service. Before we ship the module, our technicians will flash it with the latest, most stable General Motors software updates using the unique Vehicle Identification Number (VIN) you provide. This critical step ensures that the ECM communicates perfectly with all other modules in your Savana, from the transmission controller to the anti-lock brake system. It accounts for your vehicle’s specific options, engine size, and transmission type, eliminating the need for an expensive trip to the dealership for programming.
Simple Installation Process
Once you receive your pre-programmed module, installation is straightforward. On the 2008 Savana 3500, the ECM is typically located in the left rear of the engine compartment. Simply disconnect the negative battery terminal, carefully unplug the wiring harnesses from the old module, unbolt it, and install the new one in its place. Reconnect the harnesses and the battery. In some cases, a simple security relearn procedure (often called a key-cycle relearn) may be required, which you can perform yourself in your driveway without any special tools. This ensures the anti-theft system recognizes the new module. Full instructions for this procedure are readily available online or in your vehicle’s service manual.
This module is a direct replacement for part numbers 12622141, 12612384, and 12617568 and fits a wide range of GM vehicles beyond the Savana. Please check the comprehensive fitment list to confirm compatibility with your specific model and engine option.
Frequently Asked Questions
Do I need to get this module programmed by a dealer?
No. We handle all the programming for you before shipment. Simply provide us with your vehicle’s VIN during or after checkout, and we will load the correct GM software for your specific vehicle. This makes the installation process much simpler and saves you money.
What is a VIN and why do you need it?
The VIN, or Vehicle Identification Number, is a unique 17-digit code for your specific vehicle. It contains information about the manufacturer, model, year, engine, and factory-installed options. We use the VIN to access the exact factory software file from GM’s database, ensuring the new ECM is a perfect match for your vehicle’s configuration.
Will this fix my Check Engine Light?
If the Check Engine Light is on due to an internal failure of the original ECM, then yes, this part will resolve the issue. However, the light can be triggered by many other failing components. It’s always best to have the vehicle scanned for diagnostic trouble codes (DTCs) to confirm the ECM is the likely cause of the problem.
Is a ‘relearn’ procedure required after I install it?
In many cases, a security relearn procedure is necessary for the vehicle’s anti-theft system to recognize the new module. This can typically be done without special tools by following a series of key-on/key-off steps. Some vehicles may also require a Crankshaft Position Sensor (CASE) relearn, which requires a compatible professional scan tool, to extinguish the check engine light, though the vehicle will still run and drive without it.
Where is the ECM located on my 2008 Savana 3500?
For the 2008 GMC Savana 3500 van with a gasoline engine, the Engine Control Module is located in the engine bay, typically on the driver’s side towards the rear of the compartment.