2018 Sierra 1500 ECM 12686383 Programmed Engine Computer Module

Restore Your Sierra’s Performance

Fix stalling, no-start, and check engine light issues with this direct-fit ECM for your 2018 Sierra 1500. It arrives programmed to your truck’s VIN with the latest GM software. Get back on the road fastโ€”order yours today!

$279.95

+11.99 USPS Priority Shipping

Availability: In stock



SKU: 590-10246-23 Categories: ,
Guaranteed Safe Checkout

Is Your 2018 Sierra 1500 Running Rough or Not Starting?

If your truck is suddenly stalling, refusing to start, or throwing a check engine light with communication codes like P0606, you’re likely dealing with a failing Engine Control Module (ECM). As the brain of your vehicle’s engine, when the ECM falters, it can cause a host of confusing and frustrating problems. I’ve seen it countless times in my shop: a perfectly good engine crippled by a faulty computer, leaving the owner stranded.

The Right Solution: A Programmed ECM Ready for Your Truck

This isn’t just a replacement part; it’s a complete solution. We take a genuine GM ECM (interchangeable with part numbers 12704475, 12692069, 12680656, 12686383, and 12688528) and professionally flash it with the most current General Motors software calibrated specifically to your truck’s Vehicle Identification Number (VIN). This critical step ensures all factory drivability updates and fixes are loaded, providing reliability that a generic, unprogrammed module from a parts store simply can’t match. Just provide your VIN at checkout, and we handle the complex programming for you.

Expert Pro Tip: Check Your Grounds First!

Before you even unbolt the old ECM, do yourself a favor and inspect the main engine-to-chassis ground strap. I’ve diagnosed dozens of trucks where a corroded or loose ground strap was causing voltage issues that mimicked a bad ECM. It’s a 5-minute check that can save you a lot of time and hassle. A clean, tight connection is essential for the health of any electronic module.

Common Symptoms of a Failing 2018 Sierra 1500 ECM

  • โœ” Unexplained stalling or engine shutting off while driving
  • โœ” Complete no-start condition where the engine cranks but won’t fire
  • โœ” Check Engine Light with ECM-related diagnostic trouble codes (DTCs)
  • โœ” Poor fuel economy and rough idling
  • โœ” Communication errors with diagnostic scan tools
  • โœ” Erratic transmission shifting or other module malfunctions

Installation & Required Relearn Procedures

Physically swapping the module is straightforward. However, this is a sophisticated electronic component integrated with your vehicle’s security system. Please read the following carefully.

  1. Safety First: Always disconnect the negative battery terminal before beginning any work.
  2. Locate the ECM: On the 2018 Sierra 1500, the ECM is located in the left (driver’s side) front of the engine compartment.
  3. Swap the Module: Carefully disconnect the electrical connectors and unbolt the old ECM. Install the new module and securely reconnect the connectors.
  4. Reconnect Battery: Reattach the negative battery terminal.

CRITICAL NOTICE: Post-Installation Relearns are Required

Because this module is tied to your vehicle’s anti-theft system, a Vehicle Theft Deterrent Relearn is often necessary after installation. If the truck does not start, this procedure MUST be performed using a professional GM diagnostic tool with access to Tis2web or Techline Connect. This is not a step that can be bypassed. Additionally, other system initializations, such as a Crankshaft Variation Relearn or fuel injector flow rate programming, may be required for optimal performance. The responsibility for performing these post-installation procedures lies with the end-user or their technician.

Guaranteed Vehicle Fitment

This ECM is a direct replacement for the following models and options. Please verify your part number or consult the list below.

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

Yes

Interchange part number

Condition

Seller refurbished

Year

2018

Model

Sierra 1500 Pickup

Make

Brand

GM

MPN

12686383

Manufacturer Part Number

, , , ,

Manufacturer Warranty

1 Year

Hardware Type

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