Is Your 2016 Savana 3500 Running Rough? The ECM Might Be the Culprit.
As the central command center for your vehicle’s engine, the Engine Control Module (ECM) is responsible for managing everything from fuel injection and ignition timing to emissions controls and transmission shifting. When it begins to fail, it can cause a cascade of frustrating and often mysterious problems. If your work van is stalling, getting poor gas mileage, or has an illuminated Check Engine Light that won’t go away, a faulty ECM is a likely cause. This replacement Engine Control Module, part number 12668991, is the definitive solution to restore your van’s performance, reliability, and efficiency.
From the Diagnostic Bay
We had a 2016 Express van come in that was a fleet vehicle. The driver complained of intermittent stalling at stoplights and a persistent P0606 (Internal Control Module Processor Error) code. The fleet’s mechanic had already replaced the crankshaft position sensor and the throttle body, but the problem persisted. After confirming power and grounds to the module were solid, we knew it was an internal ECM fault. We installed a VIN-programmed module just like this one, performed the security relearn procedure, and the van ran perfectly. It saved the company from wasting more time and money on unnecessary parts.
Common Symptoms of a Failing GM ECM
- ✔ Persistent Check Engine Light (CEL) with communication-related or internal processor fault codes.
- ✔ Unexplained drop in fuel economy.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Rough idling or misfires.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass state emissions testing.
Why Choose Our Programmed 2016 Savana 3500 ECM?
Getting a replacement ECM isn’t as simple as just buying a used one. The module is specifically coded to the vehicle’s Vehicle Identification Number (VIN) and its unique set of options. Our service eliminates the guesswork and the need for expensive dealership programming. When you order from us, we flash the module with the latest, most stable software updates directly from GM, tailored specifically to your VIN. This ensures that your 2016 Savana 3500 ECM functions exactly as it did from the factory, often with improvements to address known issues the original software may have had.
This module is a direct replacement for a wide range of GM vehicles, not just the Savana. It is a reliable solution for numerous cars, trucks, and vans that use this specific hardware. Please see the extensive compatibility list below. This unit is a direct fit for part numbers: 12668866, 12668994, 12643636, 12663405, 12670335, 22819494, and 12692200.
Installation and Setup
Once you receive your pre-programmed module, the physical installation is straightforward. It typically involves disconnecting the battery, unplugging the electrical connectors from the old ECM, unbolting it from its mounting bracket, and installing the new one in its place. However, on most modern GM vehicles, a security relearn procedure (often called a Passlock or Passkey relearn) will be necessary to sync the new ECM with your vehicle’s anti-theft system. This procedure can usually be done without special tools and instructions are widely available online or in service manuals. This simple step ensures your vehicle will start and run with the new module.
Don’t let a failing computer keep your vehicle off the road. Restore its peak performance and reliability with a properly programmed 2016 Savana 3500 ECM. It’s the smart, efficient way to get your van back to work.
Frequently Asked Questions
Do I need to program this ECM?
No. We handle all the programming for you before shipment. Simply provide us with your vehicle’s 17-digit VIN during or after checkout, and we will flash the module with the correct GM software for your specific vehicle.
What information do you need from me?
We require your vehicle’s complete VIN to ensure the ECM is programmed correctly for your engine, transmission, and factory options. This is the most critical step for a successful installation.
Is this a plug-and-play part?
It is plug-and-play in the sense that no additional programming is required. However, you will likely need to perform a vehicle security relearn procedure after installation to allow the vehicle to start. This procedure typically takes 10-30 minutes and does not require a scan tool.
How can I be sure my original ECM is the problem?
While the symptoms listed are common for ECM failure, it’s always best to have a professional diagnosis performed. A mechanic can verify that the ECM has proper power and ground and check for communication issues with a scan tool to confirm the module itself is the point of failure before you order a replacement.
Will this fix my check engine light?
If the check engine light is caused by an internal fault within the original ECM, then yes, this replacement module will solve the issue. If the light is on for another reason (e.g., a bad sensor or wiring problem), that issue will need to be addressed separately.
What other vehicles does this part fit?
This ECM fits a wide variety of GM models, including the Chevy Cruze, Sonic, Trax, Volt, Spark, Silverado, and Suburban, as well as the GMC Sierra, Savana, and Buick Encore. Please refer to the detailed fitment list on the product page to confirm compatibility with your specific year and model.