2018-2019 Corvette ECM 12704475 | Programmed to Your VIN

Restore Your GM’s Performance & Reliability

Fix check engine lights, no-start issues, and poor performance with this VIN-programmed ECM. It arrives flashed with the latest GM software for your specific vehicle. A potential theft relearn may be required upon installation. Get back on the road fastโ€”order yours today!

$279.95

+11.99 USPS Priority Shipping

Availability: In stock



SKU: 590-10246-20 Categories: ,
Guaranteed Safe Checkout

Is Your GM Vehicle Experiencing Unexplained Engine Problems?

If you’re dealing with a frustrating check engine light, poor fuel economy, stalling, or a no-start condition in your Corvette, Silverado, Tahoe, or other compatible GM vehicle, a failing Engine Control Module (ECM) is a very likely culprit. As the central computer for your engine, the ECM’s health is critical for performance, emissions, and overall drivability. When it fails, it can create a cascade of confusing and costly issues.

This is a direct-replacement ECM, part number 12704475, which also services part numbers 12692069, 12680656, 12686383, and 12688528. We take the guesswork and hassle out of the repair by pre-programming the module to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This ensures it arrives with the latest, most stable software from General Motors, ready for installation.

Key Symptoms of a Failing GM ECM

Over my 20+ years in diagnostics, I’ve seen these modules fail in various ways. Look out for these common warning signs:

  • โœ” Check Engine Light is on with multiple, seemingly unrelated trouble codes.
  • โœ” Vehicle refuses to start or cranks but won’t turn over.
  • โœ” Noticeable drop in fuel mileage and engine performance.
  • โœ” Engine stalling, misfiring, or running rough.
  • โœ” Communication errors with scan tools or other vehicle modules.
  • โœ” Automatic transmission shifting erratically or harshly.

Expert Pro Tip: Check Your 5-Volt Reference

A common misdiagnosis for symptoms like stalling or no-start is a faulty sensor, like the crankshaft position sensor or throttle body. Before replacing the ECM, I always advise customers to check the 5-volt reference circuit. Using a multimeter, check for a steady 5V signal at several key sensors. If the voltage is low, erratic, or missing entirely, it’s a strong indicator that the ECM’s internal voltage regulator has failed, confirming the need for replacement.

Solving the Problem with a VIN-Programmed 2018-2019 Corvette ECM

Don’t let a bad computer keep your vehicle sidelined. Ordering this module is a straightforward path to a reliable repair. By providing your VIN during checkout, you receive a unit that is calibrated specifically for your vehicle’s factory settings and options. This process eliminates the need for an expensive trip to the dealership for initial programming, saving you significant time and money.

Installation & Required Relearn Procedures

Installing your new ECM is a manageable DIY job for those with basic mechanical skills. However, please be aware of the following critical post-installation steps:

  1. Safety First: Always disconnect the negative battery terminal and wait at least 15 minutes for the system to discharge before starting work.
  2. Locate and Replace: The ECM location varies by model (e.g., RH cowl under the dash on a Corvette, LH front of the engine bay on a Silverado). Carefully unplug the connectors and unbolt the old module, then install the new one in its place.
  3. Connect and Power Up: Reconnect the ECM harnesses and the negative battery terminal.
  4. IMPORTANT – Theft Deterrent Relearn: If the vehicle does not start after installation, it has entered theft-lock mode. This is normal. A Vehicle Theft Deterrent (VTD) relearn procedure MUST be performed using a professional GM-compatible scan tool with access to Tis2web or Techline Connect. This is the responsibility of the installer.
  5. Additional Relearns: Depending on your vehicle, other procedures like a Crankshaft Position Variation Relearn or Injector Flow Rate programming may be required to ensure optimal performance and clear any remaining codes.

Guaranteed Fitment For Your Vehicle

This module is the correct replacement for a wide range of GM cars, trucks, and vans. Please verify your vehicle is on the list below. The ID number can be found on the sticker of your original ECM.

  • Cadillac Escalade / ESV: 2018
  • Cadillac XTS: 2018 (3.6L, VIN 8)
  • Chevrolet Corvette: 2018-2019 (LT1 & LT4 engines)
  • Chevrolet Express 2500 / 3500 Van: 2018 (4.3L)
  • Chevrolet Silverado 1500: 2018 (ID 12680656)
  • Chevrolet Suburban 1500: 2018
  • Chevrolet Tahoe: 2018
  • GMC Savana 2500 / 3500 Van: 2018 (4.3L)
  • GMC Sierra 1500: 2018 (ID 12680656)
  • GMC Sierra Denali 1500: 2018 (ID 12686383)
  • GMC Yukon / Yukon XL 1500: 2018
Genuine OEM

Yes

Interchange part number

Condition

Seller refurbished

Year

2018 – 2019

Model

2019-corvette

Make

Brand

GM

MPN

12686383

Manufacturer Part Number

, , , ,

Manufacturer Warranty

1 Year

Hardware Type

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