Is Your Truck Plagued by Engine Problems? Get the Right Fix, The First Time.
As a technician with over two decades of experience, I’ve seen firsthand the frustration a failing Engine Control Module (ECM) can cause. Your 2017-2019 Silverado 2500 might be throwing a persistent check engine light, running rough, hesitating on acceleration, or even refusing to start. These aren’t just annoyances; they’re signs that the brain of your engine is in trouble. Don’t let a faulty computer keep your powerful 6.0L V8 sidelined. This is the reliable, straightforward solution you’ve been looking for.
The Smart Solution: A Pre-Programmed 2017-2019 Silverado 2500 ECM
Forget the hassle and expense of a dealership visit. We take the complexity out of the repair by pre-programming this ECM specifically for your vehicle. Simply provide us with your Vehicle Identification Number (VIN) after your purchase, and we’ll flash the module with the latest, most stable software updates directly from GM. This ensures that when the part arrives, it’s ready to communicate perfectly with your truck’s specific systems and options, restoring its original performance and efficiency.
- โ VIN-Programmed for Your Truck: We handle all the programming before shipping. No expensive scan tools or dealer appointments required.
- โ Latest GM Software: Your ECM arrives with the newest factory updates, often correcting issues the original software had.
- โ Direct-Fit Replacement: Guaranteed to be a perfect match for part numbers 12668986 and 12692201.
- โ Restores Engine Performance: Solves common issues like rough idle, poor fuel economy, stalling, and communication error codes.
Expert Pro Tip: Check This Before You Install
In my shop, I’ve seen new ECMs get damaged because the root cause wasn’t fixed. Before installing your new module, use a multimeter to check the 5-volt reference circuit at a few key sensors (like the Throttle Position Sensor or MAP sensor). Disconnect the sensor, turn the key to the ‘ON’ position, and test the reference wire. If you see a voltage significantly lower than 5 volts or a dead short to ground, you have a wiring or sensor issue that MUST be repaired first. This simple check can save you from damaging your new investment.
Is Your ECM Failing? Watch for These Symptoms:
- โ Check Engine Light is on with various communication or sensor codes.
- โ The engine cranks but refuses to start.
- โ Noticeable drop in fuel mileage.
- โ The engine hesitates, stumbles, or stalls unexpectedly.
- โ Transmission shifting feels harsh or erratic (as the ECM communicates with the TCM).
Plug-and-Play Installation: Get Back on the Road Fast
Installing your new ECM is a manageable job for a confident DIYer. While specific steps can vary slightly, here is a general guide for your Silverado or Sierra 2500:
- Safety First: Disconnect the negative terminal from your truck’s battery and secure it away from the post.
- Locate the ECM: On the 2017-2018 Silverado/Sierra 2500, the ECM is typically found in the LH front of the engine compartment.
- Disconnect the Harnesses: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Never force them. Inspect the connectors for any corrosion or bent pins.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket.
- Install the New ECM: Mount your new, pre-programmed ECM and securely reconnect the electrical harnesses until they click into place.
- Reconnect the Battery: Reattach the negative battery terminal. Your truck is now ready to start. A security relearn procedure may be required, which typically involves turning the key on for 10-15 minutes.
Verified Fitment Across Multiple GM Models
This module is a direct replacement for several vehicles, ensuring broad compatibility. Please verify your vehicle and options below. This part replaces part numbers 12668986 and 12692201.
- 2017-2018 Chevrolet Silverado 2500 Pickup: Electronic Control Module; (LH front engine compartment), 6.0L
- 2017-2018 GMC Sierra 2500 Pickup: Electronic Control Module; (LH front engine compartment), 6.0L
- 2017 Chevrolet Suburban 3500: Electronic Control Module; (LH front engine compartment)
- 2017-2018 Chevrolet Sonic: Electronic Control Module
- 2017-2018 Buick Encore: Electronic Control Module; (1.4L), VIN B (8th digit, opt LUV)