Is your 2016 Savana 3500 work van suddenly unreliable? If you’re dealing with frustrating issues like stalling, poor fuel mileage, a persistent check engine light, or a no-start condition, the problem often points directly to a failing Engine Control Module (ECM). As the brain of your vehicle’s powertrain, a faulty ECM can cause a cascade of problems that can bring your business or daily routine to a halt. This isn’t just an inconvenience; it’s lost time and money.
We offer a direct, reliable solution. This is a replacement Engine Control Module, service number 12663405, that arrives at your door pre-programmed to your specific vehicle. We take the guesswork and dealership hassle out of the equation. Simply provide us with your van’s Vehicle Identification Number (VIN) during checkout, and our technicians will flash the module with the latest, most stable GM factory software. This ensures perfect communication between the ECM and all other systems in your vehicle, restoring the performance and dependability you count on.
Case Study: A Tricky Diagnosis
I remember a 2016 Express 3500 (the Savana’s twin) that came into my shop with a complaint of intermittent stalling at stoplights and a random P0606 (ECM/PCM Processor Fault) code. The owner had already replaced the throttle body and a few sensors with no luck. After hooking up my scan tool and monitoring live data, I noticed the fuel trim values would suddenly drop out just before a stall. It wasn’t a fuel or air problem; it was a processing problem. The original ECM’s internal processor was failing under specific load conditions. We installed a VIN-programmed module just like this one, performed the security relearn, and the van ran perfectly. It’s a classic example of how a failing ECM can mimic other component failures, making a direct-fit, correctly programmed module the only true fix.
Is Your Van Showing These Symptoms?
A failing ECM can manifest in numerous ways. If you’re experiencing any of the following, this module is the likely solution your vehicle needs.
- â Check Engine Light is on with codes like P0601, P0606, or U0100
- â Engine cranks but refuses to start
- â Intermittent stalling or rough idling
- â Noticeable decrease in fuel economy
- â Poor engine performance and lack of power
- â Automatic transmission shifting erratically or harshly
- â Communication errors with other vehicle modules
A Straightforward Guide to Installation
Replacing the 2016 Savana 3500 Engine Control Module is a manageable job for a DIYer with basic tools. Our pre-programmed module simplifies the process significantly. While a security relearn procedure may be required after installation (which can often be done without special tools), the critical programming is already handled.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the ECM: On the Savana/Express vans, the ECM is typically located in the engine compartment on the driver’s side, near the firewall or fuse box.
- Disconnect Connectors: Carefully release the locking tabs on the electrical harnesses and pull them straight out from the module. Inspect the pins for any corrosion or damage.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. There are usually a few 10mm bolts holding it in place.
- Install the New Module: Mount your new, pre-programmed ECM onto the bracket and securely fasten the bolts.
- Reconnect Everything: Plug the electrical connectors back into the new module until they click firmly into place. Reconnect the negative battery terminal.
- Perform Security Relearn: In many cases, you will need to perform a security or anti-theft relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. Consult your vehicle’s service information for the exact procedure.
Verified Vehicle Compatibility
This module is a direct replacement for part number 12663405 and other interchangeable service numbers. While we focus on the 2016 Savana 3500 Engine Control Module, its hardware is compatible with a wide range of GM vehicles, making our VIN-specific programming essential for proper function. Please confirm your vehicle is on the list below.
SILVERADO/SIERRA 2500/3500 PICKUP (2012-2016) – 6.0L
SIERRA DENALI 2500/3500 (2012-2016) – 6.0L
SUBURBAN 3500 (2016)
CRUZE (2012-2016) – 1.4L & other gasoline engines
SONIC (2012-2016) – 1.4L & other gasoline engines
TRAX (2013-2016) – 1.4L
ENCORE (2013-2016) – 1.4L
VOLT (2011-2015)
ELR (2014-2016)
SPARK (2014-2015) – gasoline model
Note: This is not an exhaustive list. Our VIN programming makes this module specific to YOUR vehicle. Providing your VIN is mandatory for a correct order.
Frequently Asked Questions
Frequently Asked Questions
2016 Savana 3500 Engine Control Module
Why do you need my VIN?
Your VIN (Vehicle Identification Number) is essential. It allows us to load the exact, correct GM software for your vehicle’s specific options, engine, and transmission. This ensures the works perfectly right out of the box, preventing compatibility issues.