Restore Your Van’s Core Performance and Reliability
As a technician with over two decades of experience, I’ve seen firsthand how a failing Engine Control Module (ECM) can bring a dependable workhorse like a 2016 Savana 3500 to a frustrating halt. If you’re dealing with baffling issues like intermittent stalling, a persistent check engine light, or poor fuel economy, the problem often lies with the vehicle’s electronic brain. This isn’t just a replacement part; it’s a comprehensive solution. We provide a fully tested ECM, part number 12668866, that is professionally programmed to your van’s specific Vehicle Identification Number (VIN) before it ever leaves our facility. This ensures it communicates perfectly with your vehicle’s systems right out of the box.
A Technician’s Notebook: The Intermittent No-Start Nightmare
I remember a 2016 Express van (which uses the same ECM) from a local delivery company that was driving the owner crazy. It would randomly refuse to start, but only after it had been running for a while. No codes, no warning lights—just a dead crank. We tested everything: battery, starter, fuel pump. All checked out. On a hunch, I monitored the ECM data stream during a hot restart attempt and saw the 5-volt reference signal intermittently drop out. The ECM was failing internally when it got hot. We installed a VIN-programmed module just like this one, and the van was back in service the same afternoon. It’s a classic failure mode that a simple part swap, when done right with proper programming, can solve instantly.
Is Your Work Van Showing These Red Flags?
A faulty ECM can manifest in numerous ways. If you’re noticing any of the following, it’s a strong indicator that your engine computer may need replacement:
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Diagnostic Trouble Codes (DTCs) related to internal module failure, such as P0601, P0606, or P060A.
- ✔ Communication error codes like U0100 (Lost Communication With ECM/PCM).
- ✔ Vehicle refuses to start or stalls unexpectedly.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine misfires or runs rough with no other apparent cause.
A Straightforward Guide to Installation
One of the biggest benefits of our pre-programmed 2016 Savana 3500 ECM is the simple installation. Since the complex programming is already done, you can often perform the swap yourself with basic hand tools.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes for the system to discharge completely.
- Locate the ECM: On the 2016 Savana/Express vans, the ECM is typically found in the engine compartment, on the left-hand (driver’s) side, near the rear.
- Disconnect the Old Module: Carefully release the locking tabs on the electrical connectors and pull them straight out. Avoid wiggling them side-to-side. Then, unbolt the module from its mounting bracket.
- Install the New ECM: Mount your new, pre-programmed ECM onto the bracket. Firmly reconnect the electrical harnesses, ensuring they click securely into place.
- Final Steps: Reconnect the negative battery terminal. The vehicle may require a security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes. This allows the anti-theft system to recognize the new module.
Verified Vehicle Compatibility
This ECM is a direct replacement for part number 12668866 and is interchangeable with several other part numbers. It fits a wide variety of GM vehicles. Please verify your part number or match your vehicle from the list below:
Fitment Includes (but not limited to):
– 2016 SAVANA / EXPRESS 2500 & 3500 VAN (4.8L, 6.0L)
– 2012-2016 SILVERADO / SIERRA 2500 & 3500 PICKUP (6.0L)
– 2012-2016 SIERRA DENALI 2500 & 3500 (6.0L)
– 2016 SUBURBAN 3500
– 2012-2016 CHEVY CRUZE (1.4L & others)
– 2012-2016 CHEVY SONIC (1.4L & others)
– 2013-2016 BUICK ENCORE (1.4L)
– 2013-2016 CHEVY TRAX
– 2011-2015 CHEVY VOLT
– 2014-2016 CADILLAC ELR
– 2014-2015 CHEVY SPARK
Frequently Asked Questions About This 2016 Savana 3500 ECM
What do I need to do after I purchase?
What do I need to do after I purchase?
After you complete your purchase, you must provide us with your vehicle’s 17-digit VIN. We cannot program and ship your ECM without it. You can typically send this through the platform’s messaging system or add it as a note to your order.
Is any additional programming required after installation?
What do I need to do after I purchase?
After you complete your purchase, you must provide us with your vehicle’s 17-digit VIN. We cannot program and ship your ECM without it. You can typically send this through the platform’s messaging system or add it as a note to your order.
How do I find my original part number?
What do I need to do after I purchase?
After you complete your purchase, you must provide us with your vehicle’s 17-digit VIN. We cannot program and ship your ECM without it. You can typically send this through the platform’s messaging system or add it as a note to your order.
Will this fix my specific problem?
What do I need to do after I purchase?
After you complete your purchase, you must provide us with your vehicle’s 17-digit VIN. We cannot program and ship your ECM without it. You can typically send this through the platform’s messaging system or add it as a note to your order.
What is the difference between an ECM and a PCM?
What do I need to do after I purchase?
After you complete your purchase, you must provide us with your vehicle’s 17-digit VIN. We cannot program and ship your ECM without it. You can typically send this through the platform’s messaging system or add it as a note to your order.