Restore Peak Performance to Your GM Vehicle
Is your Chevrolet Express, Silverado, Cruze, or another GM vehicle suffering from frustrating issues like a persistent check engine light, rough idling, poor fuel economy, or even a no-start condition? These are common signs of a failing Engine Control Module (ECM). The ECM is the brain of your vehicle’s engine, and when it malfunctions, it can cause a cascade of performance problems. This direct-fit Engine Control Module, part number 12670335, is the reliable solution to get your vehicle running smoothly again.
The Plug-and-Play Solution: Programmed to Your VIN
Don’t waste time and money on a trip to the dealership for expensive programming. We take the hassle out of the replacement process. Before we ship your module, our experts will flash it with the latest GM-certified software specifically matched to your vehicle’s Vehicle Identification Number (VIN). This ensures that when you receive your part, it’s ready for installation right out of the box. This critical step guarantees compatibility with your vehicle’s specific systems, from the engine and transmission to the anti-theft security system.
From the Diagnostic Bay
We had a 2016 Express 3500 work van come into the shop with a list of bizarre, intermittent problems. The driver reported random stalling at stop lights, flickering dash lights, and hard shifting. The check engine light was on, but the codes were all over the place—from O2 sensors to transmission communication errors. After hours of chasing wires and checking sensors, we finally tested the ECM. We found it was failing internally, sending erratic signals. We replaced it with a pre-programmed unit like this one. The installation took less than 30 minutes, and all the ghost-in-the-machine issues vanished instantly. The customer was back on the road making money the same day, saving hundreds on dealer diagnostics and programming fees.
Common Symptoms of a Failing ECM
- ✔ Persistent Check Engine Light (CEL)
- ✔ Engine stumbling, misfiring, or stalling
- ✔ Noticeable decrease in fuel efficiency
- ✔ Difficulty starting the engine or a no-start condition
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Communication errors with diagnostic scan tools
Why Choose This 2016 Express 3500 ECM?
This module is a direct replacement for a wide range of GM vehicles, ensuring a perfect fit and function. It’s an OEM-quality part designed to meet or exceed original factory specifications. By purchasing our pre-programmed 2016 Express 3500 ECM, you are not just buying a part; you are buying a complete, ready-to-install solution that restores your vehicle’s reliability and drivability. This module is a verified replacement for multiple part numbers, including 12668866, 12668994, 12643636, 12663405, 22819494, and 12692200, making it a versatile solution for many models from 2011 to 2016.
Installation is straightforward for any competent DIY mechanic or professional technician. Simply disconnect the battery, locate and unbolt your old module, install the new one, reconnect the connectors, and re-connect the battery. In some cases, a simple security relearn procedure may be required, which can typically be performed without any special tools. Get your work van, pickup truck, or daily driver back in top condition with this dependable engine computer.
Frequently Asked Questions
Do I need to program this ECM?
No. This ECM comes fully programmed to your vehicle’s specific VIN before it is shipped. Simply provide us with your VIN during or after checkout, and we handle the rest, making it a plug-and-play installation.
What is the difference between an ECM and a PCM?
The terms are often used interchangeably. An Engine Control Module (ECM) specifically manages engine functions. A Powertrain Control Module (PCM) is an integrated unit that controls both the engine and the transmission. For most modern GM vehicles, this part serves as the central powertrain controller.
Where can I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found in several places: on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, and on your vehicle’s registration and insurance documents.
Will this fix my check engine light?
If your check engine light is caused by a faulty ECM, then yes, this part will resolve the issue. It is always recommended to have your vehicle scanned for diagnostic trouble codes (DTCs) to confirm the ECM is the source of the problem before ordering.
Is any special ‘relearn’ procedure required after installation?
In many cases, no further action is needed. However, some GM vehicles may require a simple security relearn procedure (often called a Passlock or anti-theft relearn) to sync the new ECM with your keys. This procedure can typically be done without special tools, and we can provide instructions.