Is Your Sierra 1500 Running Rough or Not Starting?
If your 2016-2018 GMC Sierra is suddenly plagued by a persistent Check Engine Light, experiencing erratic shifting, poor fuel economy, or even a frustrating no-start condition, the problem often points directly to a failing Engine Control Module (ECM). As the brain of your truck’s powertrain, when the ECM falters, it can cause a cascade of confusing and costly issues. I’ve seen it hundreds of times in my shop: owners replace sensors, spark plugs, and even fuel pumps, only to find the root cause was the computer all along.
The Smart Solution: A VIN-Programmed ECM Ready for Installation
Forget the hassle and high cost of a dealership visit. This Engine Control Module is the direct, reliable solution you need. We take the guesswork out of the repair by pre-programming the module specifically for your truck using your Vehicle Identification Number (VIN). This ensures the ECM has the latest GM factory software and calibrations loaded before it even ships. It arrives at your door ready to be installed, saving you from needing a tow to the dealer and paying their expensive programming fees.
Common Symptoms of a Failing 2016-2018 Sierra 1500 Engine Control Module:
- โ Persistent Check Engine Light (CEL) with various communication or sensor codes
- โ Engine cranks but refuses to start
- โ Noticeable loss of engine power and acceleration
- โ Poor or inconsistent fuel mileage
- โ Harsh or erratic automatic transmission shifting
- โ Stalling or misfiring issues
Expert Pro Tip from a 20-Year Veteran Technician
Before you install your new ECM, take five minutes to inspect the main engine wiring harness, specifically where it passes over the top of the engine and near the exhaust manifolds. Over time, the protective loom can become brittle from heat cycles, exposing wires. A single chafed wire grounding out against the engine block can instantly damage a new module. I’ve diagnosed countless ECM failures that were caused by this exact issue. A quick inspection and some electrical tape can prevent a repeat failure and save you a massive headache.
Simple Installation Process
Replacing the ECM on your Sierra 1500 is a straightforward job that can be done with basic hand tools. It’s typically located in the front left (driver’s side) of the engine compartment.
- Safety First: Always disconnect the negative terminal from your truck’s battery.
- Locate the ECM: Find the module on the driver’s side of the engine bay.
- Disconnect Connectors: Carefully unlatch and remove the electrical connectors. Inspect them for any corrosion or bent pins.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed ECM into place and securely reconnect the electrical connectors.
- Reconnect Battery: Re-attach the negative battery terminal.
IMPORTANT: Post-Installation Procedures Required
Because this module is programmed to your VIN, your truck’s anti-theft system will need to recognize it. If the vehicle does not start after installation, a Vehicle Theft Deterrent (VTD) Relearn procedure is required. This is a standard security step for modern GM vehicles. This procedure must be performed using a professional scan tool with access to GM’s TIS2Web or Techline Connect software. Additionally, other specific setups like a Crankshaft Position Variation Relearn or injector flow rate programming may be necessary depending on your vehicle’s exact configuration. Please be aware that performing these relearn procedures is the responsibility of the installer.
Guaranteed Compatibility
This module is a direct replacement for a wide range of GM vehicles and part numbers. Your purchase is guaranteed to be the correct fit if your vehicle is on the list below and/or you are replacing one of the following part numbers:
Interchangeable Part Numbers: 12692068, 12704476, 12686382, 12674052, 12674472, 12678815
This part will fit these makes and models with these options:
- 2016-2018 SIERRA 1500 PICKUP
- 2016-2018 SILVERADO 1500 PICKUP
- 2017-2018 SIERRA DENALI 1500
- 2017 CADILLAC ESCALADE & ESCALADE ESV
- 2017 CHEVROLET TAHOE & SUBURBAN 1500
- 2017 GMC YUKON & YUKON XL 1500
- 2017 CADILLAC ATS (3.6L LF4)
- 2017 CADILLAC CTS (6.2L Supercharged or 3.6L LF3 Twin Turbo)
- 2017 CADILLAC XTS (3.6L LF3)
- 2017 CHEVROLET CORVETTE