Is Your GM Vehicle Experiencing Critical Engine Problems?
A failing Engine Control Module (ECM) is more than just an inconvenience; it’s the root of frustrating and often mysterious issues that can sideline your vehicle. If you’re dealing with a no-start condition, intermittent stalling, a persistent check engine light with communication codes, or erratic engine performance in your Corvette, Silverado, or other compatible GM model, the ECM is the most likely culprit. As the central computer for your engine, its proper function is non-negotiable.
The Direct Solution: A VIN-Programmed ECM
Forget the hassle and high cost of a dealership visit. This is a genuine GM Engine Control Module, part number 12704475, which serves as a direct replacement for several original part numbers, including 12692069, 12680656, 12686383, and 12688528. We take the guesswork out of the repair by pre-programming the module to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This ensures it has the correct, most current factory software for your exact application.
Real-World Diagnostic Story
“A customer’s 2018 Silverado 1500 came into my shop last month with intermittent stalling and a whole host of random communication error codes. The previous mechanic had replaced two sensors and was about to suggest a new wiring harness. From my 20+ years of experience, I know these symptoms often point to the ECM’s internal power supply failing under load. We checked the main power and ground pins at the ECM connectorโthey were solid. We installed one of our pre-programmed modules, performed the security relearn, and the truck has been running perfectly ever since. It saved the customer over a thousand dollars in unnecessary diagnostic time and parts.”
Key Features of this Programmed 2018-2019 Corvette ECM
- โ VIN-Specific Programming: We flash the module with the latest GM calibrations for your exact vehicle. Just provide your VIN at checkout.
- โ Broad Compatibility: This single module replaces multiple part numbers, making it a versatile solution for a wide range of GM cars, trucks, and vans.
- โ Restores Performance: Corrects common failure symptoms like no-start, stalling, false sensor codes, and poor fuel economy.
- โ Direct-Fit Replacement: Engineered to mount and connect just like the original, with no modifications required.
Installation & Important Post-Install Procedures
While the physical installation is straightforward, please be aware that additional electronic setup is required. This is standard procedure for modern vehicle computer replacement.
- Safety First: Always disconnect the negative battery terminal before beginning any work on the vehicle’s electrical system.
- Locate and Replace: Find your old ECM (location varies by model, see list below) and swap it with the new module.
- Reconnect Battery: Once the new module is securely installed, reconnect the battery terminal.
- Perform Security Relearn: This is a mandatory step. If the vehicle does not start, you or your mechanic must perform the Vehicle Theft Deterrent (VTD) relearn using a professional tool with access to GM’s Tis2web or Techline Connect service.
- Additional Relearns: Depending on your vehicle, other procedures like a Crankshaft Variation Relearn or Injector Flow Rate programming may be necessary to ensure optimal performance. This is the responsibility of the installer.
Verified Vehicle Fitment
This module is confirmed to fit the following vehicles. Please verify your part number or contact us with your VIN to ensure compatibility.
- 2018-2019 Corvette: (RH cowl under dash) – Fits LT1 & LT4 engines
- 2018 Silverado 1500 Pickup: (LH front engine compartment)
- 2018 Sierra 1500 / Denali 1500 Pickup: (LH front engine compartment)
- 2018 Escalade / Escalade ESV: (Engine compartment)
- 2018 Tahoe / Suburban 1500: (LH front engine compartment)
- 2018 Yukon / Yukon XL 1500: (LH front engine compartment)
- 2018 Express / Savana 2500 & 3500 Vans: (LH rear engine compartment) – 4.3L only
- 2018 Cadillac XTS: (3.6L, VIN 8 – opt LF3)