Restore Peak Performance to Your 2016 Chevy Express 3500 Van
Is your work van or truck suddenly running rough, stalling, or showing a persistent Check Engine Light? As a technician with over two decades of experience, I know that intermittent electrical gremlins and poor engine performance often point directly to a failing Engine Control Module (ECM). Your vehicle’s ECM is its brain, managing everything from fuel injection and ignition timing to transmission shifting. When it falters, the entire vehicle suffers. This isn’t just an inconvenience; for a work vehicle like the Express 3500, downtime means lost income. This replacement 2016 Express 3500 Van ECM is the definitive solution to get your vehicle running reliably again.
We take the guesswork and high dealership costs out of the equation. Each module is professionally programmed with the latest GM software updates specifically for your vehicle using the VIN you provide. This means it arrives at your door ready for installation, with no need for expensive trips to a dealer for programming. It’s a direct-fit replacement designed to restore the original performance and efficiency you depend on.
Case Study: A Tricky Diagnosis
I remember a 2016 Express 3500 from a local plumbing company that came into my bay with a complaint of random stalling and a flashing Check Engine Light. The driver said it only happened after the van was fully warmed up on hot days. We scanned it and found a P0606 code (ECM/PCM Processor Fault). After verifying all power and ground circuits to the module were solid—a critical first step—we knew the internal processor was failing under heat. Swapping in a pre-programmed module like this one had their van back in service the same afternoon, saving them from losing a full day’s work and the high cost of a dealership repair.
Is Your Van Showing These Red Flags?
A failing ECM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your engine computer needs replacement. Look out for:
- ✔ Unexplained Check Engine Light illumination
- ✔ Common diagnostic trouble codes (DTCs) such as P0601, P0606, or U0100
- ✔ Engine stalling, stumbling, or hesitating during acceleration
- ✔ Noticeable decrease in fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ The vehicle won’t start at all, but the battery and starter are good
- ✔ Failure to pass state emissions testing
A Straightforward Guide to Installation
Replacing the 2016 Express 3500 Van ECM is a manageable job for a DIYer with basic tools. Following these steps will ensure a smooth process.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- Locate the ECM: On the Express/Savana vans, the ECM is typically located in the left-hand rear of the engine compartment. Consult your service manual to confirm the exact location for your specific model.
- Disconnect Connectors: Carefully release the locking tabs on the electrical wiring harnesses and gently pull them straight out from the module. Do not force them. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the mounting hardware, as you will need it for the new module.
- Install the New ECM: Mount the new module securely onto the bracket using the original hardware.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new ECM until you hear them click into place. Reconnect the negative battery terminal.
- Perform Relearn (If Necessary): While this module is pre-programmed, some vehicles require a security or crank-sensor relearn procedure. This can often be done without special tools. A common method is to turn the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeat this cycle three times before attempting to start the engine.
Verified Compatibility Across the GM Lineup
While this is the correct part for your 2016 Express 3500 Van ECM, this versatile module also serves as a direct replacement for a wide variety of other GM cars, trucks, and vans. Please verify your part number (12670335) or check the list below. This module is compatible with part numbers 12668866, 12668994, 12643636, 12663405, 22819494, and 12692200, and fits models including:
- Chevrolet Cruze (2012-2016)
- Chevrolet Sonic (2012-2016)
- Chevrolet Trax (2013-2016)
- Chevrolet Volt (2011-2015)
- Chevrolet Spark (2014-2015)
- Chevrolet ELR (2014-2016)
- Chevrolet Express / GMC Savana 2500/3500 Vans (2016 with 4.8L or 6.0L)
- Chevrolet Silverado / GMC Sierra 2500/3500 Pickups (2012-2016 with 6.0L)
- Chevrolet Suburban 3500 (2016)
- Buick Encore (2013-2016)
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential. We use it to load the exact, correct GM-certified software for your vehicle’s specific configuration, including engine, transmission, and emissions options. This ensures perfect compatibility and function right out of the box.
Is this a plug-and-play part?
Yes, for most vehicles. Because we program it to your VIN, it is ready for installation. However, some GM vehicles may require a simple, key-on/key-off security relearn procedure after installation, which does not require any special tools.
Will this fix my Check Engine Light?
If the Check Engine Light is caused by an internal failure of the ECM (e.g., codes P0601, P0606), then yes, this part will resolve the issue. It’s crucial to properly diagnose the problem first, as the light can be triggered by many other sensors or components.
Where is the ECM located on my 2016 Express Van?
On the 2016 Express 3500 Van, the Engine Control Module is typically found in the engine compartment, mounted on the driver’s side (LH) towards the rear firewall.
Does this part come with a warranty?
Yes, all our modules come with a warranty that covers any defects in the part itself. We stand behind the quality of our products to give you peace of mind with your purchase.