Restore Peak Performance to Your GM Vehicle
Is your truck or van running rough, stalling unexpectedly, or flashing a persistent Check Engine Light? These are classic signs of a failing Engine Control Module (ECM), the computer that acts as your vehicle’s brain. A faulty ECM can cause a cascade of frustrating issues, from poor fuel mileage to a complete no-start condition. This replacement ECM, part number 12670335, is the reliable, straightforward solution to get your vehicle running properly again. We take the guesswork and hassle out of the repair by programming the module specifically for your vehicle using your VIN. It arrives loaded with the latest factory software from GM, ready for installation.
From the Diagnostic Bay: The Intermittent No-Start Nightmare
I once had a 2016 Silverado 2500 in my shop that was driving the owner crazy. It would start perfectly for a week, then refuse to crank for two days, with no rhyme or reason. There were no consistent trouble codes, just a sporadic U0100 (Lost Communication with ECM). After hours of chasing wires and checking grounds, we swapped in a known-good ECM. The problem vanished instantly. The original module’s internal processor was failing intermittently under certain temperatures. This is why having a quality, correctly programmed 2016 Suburban 3500 ECM (or for any compatible vehicle) is non-negotiable. This pre-programmed unit saves hours of diagnostic time and eliminates the need for expensive dealer-only tools.
Is Your GM Vehicle Showing These Symptoms?
A failing ECM can manifest in many ways. If you’re experiencing any of the following, it’s a strong indicator that your engine’s computer needs attention:
- ✔ Check Engine Light is illuminated with codes like P0601, P0606, or U0100.
- ✔ Engine cranks but refuses to start.
- ✔ Intermittent stalling or hesitation during acceleration.
- ✔ Noticeable decrease in fuel economy.
- ✔ Rough or erratic automatic transmission shifting.
- ✔ Communication issues with diagnostic scan tools.
A Straightforward Guide to Installation
Replacing your ECM is a manageable job for a confident DIYer. While specific locations vary slightly by model (e.g., LH front engine compartment on trucks, LH rear on vans), the general process is consistent.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes for the system to fully discharge.
- Locate the ECM: Find the existing module. On most trucks like the Silverado, Sierra, and Suburban, it’s on the driver’s side of the engine bay, near the firewall or inner fender.
- Disconnect Connectors: Carefully unclip the wiring harness connectors. They have locking tabs that need to be released before you can pull them straight out. Avoid forcing them.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed ECM into place and securely reconnect the wiring harnesses. You should hear a ‘click’ as they lock.
- Reconnect the Battery: Re-attach the negative battery terminal.
- Perform Security Relearn: Most GM vehicles will require a simple security relearn procedure to recognize the new ECM. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating two more times. Your vehicle’s service manual will have the exact procedure.
Verified Vehicle Compatibility
This module is a direct replacement for a wide range of General Motors vehicles. It is compatible with multiple original part numbers, including 12668866, 12668994, 12643636, and 12670335. Please verify your part number or contact us with your VIN to confirm fitment. Key compatible models include:
- ✔ 2016 Suburban 3500
- ✔ 2012-2016 Silverado & Sierra 2500/3500 (6.0L)
- ✔ 2016 Express & Savana 2500/3500 (4.8L, 6.0L)
- ✔ 2012-2016 Chevrolet Cruze & Sonic (1.4L)
- ✔ 2013-2016 Buick Encore & Chevrolet Trax (1.4L)
- ✔ 2011-2015 Chevrolet Volt
- ✔ 2014-2016 Cadillac ELR
- ✔ And many more. See the detailed list or contact us for confirmation.
Choosing this professionally programmed 2016 Suburban 3500 ECM is the smartest way to solve complex engine management problems, saving you a costly trip to the dealership and getting you back on the road with confidence.
Frequently Asked Questions
What does ‘VIN Programmed’ mean?
It means we load the module with the specific software and calibrations for your exact vehicle using its 17-digit Vehicle Identification Number (VIN). This ensures perfect compatibility with your engine, transmission, and options, eliminating the need for a dealer to program it.
Will I need to do any other programming after installation?
No additional programming is required. However, you will likely need to perform a simple ‘Security Relearn’ or ‘Key Relearn’ procedure, which can be done without any special tools and takes about 30 minutes. Instructions are readily available online or in your owner’s manual.
How do I find the part number on my old ECM?
The part number is printed on a sticker on the case of your current ECM. It will typically be a long number, such as 12670335. Matching this number is the best way to ensure you’re ordering the correct hardware.
Is this a new or used part?
This is a high-quality, tested, and guaranteed functional used OEM part. Each unit is inspected and then programmed with the latest GM software for your vehicle, offering OEM reliability at a fraction of the cost of a new module.
What happens if I don’t provide my VIN?
We cannot ship the module until we receive your VIN. The programming is essential for the part to function in your vehicle. Please provide your VIN during checkout or send it to us in a message immediately after your purchase to avoid delays.