Restore Peak Performance to Your GM Truck or SUV
Is your 2014-2016 Sierra 1500, or another compatible GM vehicle, suffering from baffling issues like stalling, poor fuel economy, a persistent check engine light, or a complete no-start condition? The Engine Control Module (ECM), the electronic brain of your vehicle, is often the culprit. When it fails, it can cause a cascade of problems that are frustrating to diagnose. This replacement Engine Control Module, part number 12669318, is the definitive solution to get your vehicle running reliably again.
We take the guesswork and hassle out of the repair. Unlike a generic part from a salvage yard, each module we ship is pre-programmed with the latest official GM software, tailored specifically to your vehicle’s VIN. This means no expensive trips to the dealership for programming. It arrives at your door ready for installation, saving you time and money.
Case Study: A Tricky Diagnosis
A customer brought in a 2015 Silverado with an intermittent no-start problem that had stumped two other shops. The truck would run fine for days, then refuse to start, with no communication to the scan tool. After checking all the basics—battery, grounds, and wiring harnesses—we focused on the ECM. On the surface, it looked fine. But by monitoring network data during a failure, we saw the ECM was dropping offline entirely. We swapped in one of our pre-programmed modules, and the problem was solved instantly. It’s a classic example of how a failing 2014-2016 Sierra 1500 ECM can create ghost-like issues that are nearly impossible to trace without replacing the unit.
Common Signs of a Failing Engine Computer
- ✔ 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 drops in fuel efficiency.
- ✔ Rough idling, stalling, or hesitation during acceleration.
- ✔ Automatic transmission shifting erratically or harshly.
- ✔ Communication errors with your diagnostic scan tool.
- ✔ Seemingly unrelated warning lights appearing on the dashboard.
A Straightforward Guide to Installation
Installing your new 2014-2016 Sierra 1500 ECM is a manageable job for a DIY enthusiast. While the exact location varies slightly by model, the process is generally the same. Always consult a service manual for your specific vehicle.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the ECM: On most Sierra/Silverado models, it’s found in the front of the engine compartment on the driver’s side, near the air filter box.
- Disconnect the Connectors: Carefully release the locking tabs on the wiring harness connectors and pull them straight out from the module. Do not force them.
- Remove the Old Module: Unbolt the ECM from its mounting bracket. There are typically a few bolts holding it in place.
- Install the New Module: Seat the new, pre-programmed ECM into the bracket and secure it with the bolts.
- Reconnect Everything: Plug the wiring harnesses back into the new ECM until they click securely. Reconnect the negative battery terminal.
- Perform Security Relearn: Your vehicle may require a security relearn procedure to recognize the new ECM. This can typically be done without special tools by cycling the key in the ignition. Instructions are readily available online for your specific model.
Will This Fit My Vehicle?
This module is a direct replacement for part number 12669318 and is interchangeable with several other GM part numbers, including 12692067, 12676230, 12656993, and more. It is guaranteed to fit the following models, but please verify your part number or contact us with your VIN to ensure compatibility.
SIERRA 1500 PICKUP 14-16
SIERRA DENALI 1500 14-16
TAHOE 15-16
SUBURBAN 1500 15-16
YUKON & YUKON XL 1500 15-16
ESCALADE & ESCALADE ESV 15-16
CORVETTE 14-16
CAMARO 16 (6.2L)
CTS 14-16 (3.6L, 6.2L)
ATS 14-16 (3.6L)
XTS 14-16 (3.6L)
CANYON 15-16 (3.6L)
COLORADO 15-16 (3.6L)
Note: Specific options or ID numbers may apply. Providing your VIN is the best way to guarantee a perfect match.
Frequently Asked Questions
Do I need to do anything after I buy this?
Do I need to do anything after I buy this?
Yes. After your purchase, you MUST provide us with your vehicle’s 17-digit VIN (Vehicle Identification Number). We need this to program the module with the correct, vehicle-specific software and calibrations from GM before we can ship it to you.
Is this a simple plug-and-play installation?
Do I need to do anything after I buy this?
Yes. After your purchase, you MUST provide us with your vehicle’s 17-digit VIN (Vehicle Identification Number). We need this to program the module with the correct, vehicle-specific software and calibrations from GM before we can ship it to you.
How do I know if this part number is correct?
Do I need to do anything after I buy this?
Yes. After your purchase, you MUST provide us with your vehicle’s 17-digit VIN (Vehicle Identification Number). We need this to program the module with the correct, vehicle-specific software and calibrations from GM before we can ship it to you.
Will this fix my check engine light?
Do I need to do anything after I buy this?
Yes. After your purchase, you MUST provide us with your vehicle’s 17-digit VIN (Vehicle Identification Number). We need this to program the module with the correct, vehicle-specific software and calibrations from GM before we can ship it to you.