Is Your Work Van Unreliable? Get Back on the Job Fast.
If your 2016 Savana 3500 is suddenly stalling, refusing to start, or running rough with the check engine light glaring at you, a failing Engine Control Module (ECM) is a likely culprit. For a work vehicle, downtime isn’t just an inconvenienceโit’s lost income. This isn’t a part you can afford to guess on. You need a reliable, direct-fit solution that gets you back on the road without the hassle and expense of a dealership visit.
This is a genuine OEM replacement Engine Control Module, part number 12668866, that arrives at your door fully programmed to your vehicle’s specific VIN. We handle the complex part for you. Using official GM software, we load the latest factory calibrations directly onto the module before it ships. This means no extra programming fees, no special tools, and no waiting for a dealership appointment. It’s the most efficient way to restore your van’s performance and reliability.
From the Shop Floor: A Real-World Diagnosis
“A customer’s 2016 Savana 3500 work van came in last week with a persistent P0300 random misfire code and terrible fuel economy. The owner had already replaced all the spark plugs and a couple of ignition coils, but the problem remained. After hooking up my scan tool and monitoring live data, I noticed the fuel trim values were erratic and injector pulse widths weren’t responding correctly under load. This pointed away from the individual components and toward the driver circuit inside the computer. We installed one of our pre-programmed ECMs, and the van ran perfectly. It’s a classic case where the ‘brain’ is the issue, not the parts it controls. This is a common misdiagnosis I’ve seen hundreds of times that costs people time and money on unnecessary parts.”
Symptoms of a Failing 2016 Savana 3500 ECM
A faulty engine computer can cause a wide range of frustrating issues. If you’re experiencing any of the following, this module is the solution you need:
- โ Check Engine Light is on with various trouble codes
- โ Engine cranks but refuses to start
- โ Stalling, hesitation, or rough idling
- โ Noticeable decrease in fuel efficiency
- โ Poor engine performance and lack of power
- โ Communication errors with diagnostic scan tools
Plug-and-Play Installation: No Dealer Visit Required
Installing your new ECM is a straightforward process. Because we program it beforehand, you can perform the replacement yourself and skip the dealership entirely. This module is located in the LH (driver’s side) rear of the engine compartment.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait 10-15 minutes for the system to fully discharge.
- Locate the ECM: Find the module on the driver’s side, towards the back of the engine bay.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old ECM. Inspect the pins and connectors for any corrosion or damage and clean them if necessary.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed ECM into place and securely reconnect the wiring harnesses. Ensure they click into place.
- Reconnect Battery: Reattach the negative battery terminal. The vehicle may need to complete a security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes. Your vehicle’s service manual will have the exact steps.
Guaranteed Compatibility
This ECM is a direct replacement for a wide range of GM vehicles and is guaranteed to function correctly if your original module carries any of the following part numbers: 12668866, 12668994, 12643636, 12663405, 12670335, 22819494, or 12692200. It is the correct fit for the 2016 Savana 3500 with either the 4.8L or 6.0L engine, as well as many other models like the Express, Silverado, Sierra, Cruze, and more. Simply provide your VIN at checkout, and we’ll ensure it’s a perfect match.