Restore Peak Performance to Your Workhorse Van
As a technician with over two decades of experience, I know that when a work van like your 2016 Savana 3500 is down, it’s not just an inconvenience—it’s costing you money. The Engine Control Module (ECM), or PCM, is the brain of your vehicle’s operation, managing everything from fuel delivery and ignition timing to transmission shifting. When it starts to fail, you’re faced with frustrating, often intermittent problems that can sideline your operations. This isn’t just a replacement part; it’s a reliable, VIN-programmed solution designed to get your van back on the road and running dependably.
We take the guesswork and dealership hassle out of the equation. This module is meticulously programmed with the latest official GM software updates specifically for your vehicle’s VIN. This ensures all factory parameters are correctly set, addressing potential drivability issues that may have been present even before the original module failed. By installing this pre-flashed 2016 Savana 3500 ECM, you’re not just fixing the problem—you’re ensuring your engine and transmission operate in perfect harmony, just as the manufacturer intended.
Case Study: A Tricky Diagnosis
I remember a fleet customer with a 2016 Express 3500 (which uses the same powertrain as the Savana) that was driving his team crazy. The van would randomly stall at traffic lights, but never stored a consistent trouble code. They had replaced the fuel pump and cleaned the throttle body with no success. After checking all the wiring and grounds, we hooked up a scope to the main processor outputs on the ECM. We found that the 5-volt reference signal would intermittently drop out under load, causing the stall. A new, properly programmed ECM like this one solved the issue permanently. It’s a classic example of how a failing module can create phantom problems that are otherwise impossible to trace.
Is Your Van Showing These Symptoms?
A faulty ECM can manifest in numerous ways. If you’re experiencing any of the following, a failing engine computer is a likely culprit. In my shop, these are the tell-tale signs I look for when diagnosing a potential ECM failure.
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling, especially when warm.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication errors with your scan tool (e.g., U0100 – Lost Communication With ECM/PCM).
- ✔ Misfires or poor engine performance with no other apparent cause.
A Straightforward Guide to Installation
Installing your new 2016 Savana 3500 ECM is a job most DIYers or any professional mechanic can handle. The key is our pre-programming service, which eliminates the need for expensive dealer tools.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
- Locate the ECM: On the Savana and Express vans, the ECM is typically located in the left-hand (driver’s side) rear of the engine compartment.
- Disconnect the Connectors: Carefully release the locking tabs on the wiring harness connectors and pull them straight out from the module. Inspect the connectors for any corrosion or damaged pins.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the mounting hardware as you will need it for the new unit.
- Install the New Module: Mount your new, pre-programmed ECM onto the bracket and secure it with the original hardware.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new ECM until they click into place. Reconnect the negative battery terminal.
- Final Steps: In some cases, a security or throttle relearn procedure may be required. This can often be completed by cycling the key a few times. Consult your vehicle’s service information for any specific relearn steps.
Verified Vehicle Compatibility
This module is a direct replacement for part number 12670335 and other interchangeable numbers. While this listing is for the 2016 Savana 3500 ECM, it also fits a wide range of other GM vehicles. Please verify your part number and application from the list below. Providing your VIN during checkout is essential to guarantee we send you a perfectly matched and programmed unit.
This part is a confirmed fit for the following part numbers: 12668866, 12668994, 12643636, 12663405, 12670335, 22819494, 12692200.
Compatible Models Include:
- Buick Encore (2013-2016, 1.4L)
- Cadillac ELR (2014-2016)
- Chevrolet Cruze (2012-2016)
- Chevrolet Express 2500/3500 Van (2016, 4.8L & 6.0L)
- Chevrolet Silverado 2500/3500 Pickup (2012-2016, 6.0L)
- Chevrolet Sonic (2012-2016)
- Chevrolet Spark (2014-2015)
- Chevrolet Suburban 3500 (2016)
- Chevrolet Trax (2013-2016)
- Chevrolet Volt (2011-2015)
- GMC Savana 2500/3500 Van (2016, 4.8L & 6.0L)
- GMC Sierra 2500/3500 Pickup (2012-2016, 6.0L)
- GMC Sierra Denali 2500/3500 (2012-2016, 6.0L)
Frequently Asked Questions
Do I need to get this module programmed by a dealer?
No. The main benefit of our service is that we program the module to your vehicle’s specific VIN before we ship it. This means it arrives ready for installation, saving you a trip to the dealership and additional programming fees.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). You can typically find this on your vehicle’s registration, insurance card, or on a plate on the driver’s side dashboard visible through the windshield.
Is this a brand new part?
This is a high-quality, tested, and guaranteed functional OEM component. Each unit is inspected and then loaded with the latest GM-certified software for your specific vehicle to ensure reliable performance.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the ECM (common codes P0601, P0606), then yes, this part will resolve the issue. However, it’s always recommended to have a proper diagnosis performed to ensure the ECM is the root cause and not another sensor or component.
What if my part number isn’t listed?
The listed part numbers (e.g., 12670335, 12668866) cover a wide range of applications. If your part number is different, please contact us with your VIN and original part number. We can verify compatibility to ensure you get the correct module.