Restore Peak Performance to Your GM Vehicle
Is your 2016 Savana 2500 van or other GM vehicle plagued by frustrating issues like a persistent Check Engine Light, rough idling, stalling, or poor fuel economy? These are classic signs of a failing Engine Control Module (ECM), the electronic brain of your vehicle. A faulty ECM can disrupt everything from fuel delivery and ignition timing to transmission shifting, making your vehicle unreliable and unsafe. Don’t let a bad computer keep you off the road or force an expensive trip to the dealership for programming.
This is a direct-replacement Engine Control Module, part number 12670335, that arrives at your door fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We handle the complex part: flashing the unit with the latest, most stable software updates directly from GM. This ensures that once installed, it communicates perfectly with your vehicle’s other systems, restoring the original performance and efficiency you depend on. This isn’t just a part; it’s a complete, ready-to-install solution.
Case Study: A Tricky Diagnosis
I remember a 2016 Express 2500 work van that came into my shop. The owner, a plumber, was losing money every day it was down. The van had an intermittent no-start condition with no consistent trouble codes—the worst kind of electrical gremlin. We checked the fuel pump, ignition system, and wiring harnesses, but everything tested fine. Finally, on a hunch, we monitored the data stream from the ECM during a failed start attempt and saw the 5-volt reference signal dropping out. The internal processor of the original ECM was failing under load. We replaced it with a VIN-programmed unit like this one. The van started on the first try and never came back for that issue. A simple part replacement saved the owner hundreds in lost work and diagnostic fees.
Is Your Vehicle Showing These Telltale Signs?
A failing ECM can manifest in numerous ways. If you’re experiencing any of the following, your engine computer is the likely culprit:
- ✔ Check Engine Light is on with internal processor codes (e.g., P0601, P0602, P0606).
- ✔ Communication errors with scan tools or other modules (e.g., U0100 – Lost Communication with ECM/PCM).
- ✔ Engine cranks but refuses to start.
- ✔ Unexplained stalling or rough, erratic idling.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Misfire conditions that aren’t resolved by new spark plugs or coils.
Straightforward Installation Guide to Get You Running
Installing your new ECM is a manageable job for a confident DIYer. By following these steps, you can avoid a trip to the shop. Always consult a vehicle-specific repair manual if you are unsure.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the ECM: On most Savana and Express vans, the ECM is located in the engine compartment, typically on the driver’s side near the firewall or battery.
- Disconnect Connectors: Carefully release the locking tabs on the electrical wiring harnesses and pull them straight out from the module. Do not force them.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the hardware as you will need it for the new module.
- Install the New ECM: Mount your new, pre-programmed ECM onto the bracket and secure it with the original hardware.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
- Perform Relearn (If Necessary): In some cases, a security or crank-relearn procedure may be required. This can often be done without special tools by cycling the key. We include instructions for this simple process. Your vehicle is now ready to start.
Verified Compatibility Across GM Models
This module is a reliable replacement for a wide array of GM cars, trucks, and vans. Please verify your vehicle is on this list and that the part number matches one of the alternates below. Providing your VIN at checkout is essential for us to ensure perfect programming and compatibility.
Replaces Part Numbers: 12668866, 12668994, 12643636, 12663405, 12670335, 22819494, 12692200
Frequently Asked Questions
Do I need to do any programming after I receive this ECM?
No. We program the module to your vehicle’s VIN before shipping. It arrives ready for installation. In some cases, a simple key-cycle security relearn procedure is needed, and we provide easy-to-follow instructions for that.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship the part until we receive and validate your VIN.
Is this a guaranteed fix for my vehicle’s problems?
This module will fix issues directly caused by a faulty ECM. While the symptoms listed are common for ECM failure, it’s crucial to ensure your vehicle has been properly diagnosed. This part will not fix problems related to other faulty sensors or mechanical issues.
Where is the ECM located on my 2016 Savana 2500 Van?
On the 2016 Savana/Express vans, the Engine Control Module is typically found in the engine bay on the driver’s side, mounted near the brake master cylinder or the main fuse block.
Will this work for both the 4.8L and 6.0L engines?
Yes, this ECM is compatible with both the 4.8L and 6.0L V8 engines in the 2016 Express and Savana vans. The VIN-specific programming ensures it has the correct software for your engine and transmission combination.