My Account About Us Help Desk
Go-Parts
Account About Us Help Desk
Cart 0
Your cart is empty
Add an item to see it appear here.
This photo shows a similar part, not the exact one you'll receive. Since each used part has its own wear, yours may look slightly different.
OEM Engine Control Module (ECM) for 2018, 2019 Cadillac, Chevrolet, & GMC - Front, Left (Driver)
Image 1 Image 2 Image 3 Image 4 Image 5 Image 6 Image 7 Image 8 Image 9 Image 10

OEM Engine Control Module (ECM) for 2018-2019 Cadillac, Chevrolet, & GMC - Front, Left (Driver)

$ 129 .95
30-DayReturns
6-monthWarranty
100%Money-Back

Condition: Good (B) — minor wear, fully functional

Professionally inspected and tested.

Odometer 161,600 miles at removal

Product Notes Read before buying

This is a used Engine Control Module (ECM). It is a programmable control module. This part fits vehicles with the 4.3L engine. It also fits vehicles where the 8th digit of the VIN is 6 (option code LT4), 7 (option code LT1), or 8 (option code LF3).

1 Other Matching Unit Available

Same part, different stock options.

See All Other Electronic Control Modules

Why Buy Used OEM Parts?

Checked & Tested

We check and test every used part before we sell it. It may show some wear, but it works and is ready to install.

Original Equipment

This is the same part your vehicle came with from the factory. It fits and works just like the original — because it is one.

Works Like New

A few marks on the outside don't change what's inside. The part works the way it should.

Big Savings

Pay 50–80% less than buying new. Same factory part, much lower price.

Wrenchy the Robot
Not sure? Ask Wrenchy — Your Parts Assistant.

Voice or type your vehicle details and Wrenchy will confirm fitment in seconds.

Vehicle Fitment Guide

This part fits the following vehicles:

Cadillac 3 models(tapclick to expand)(tapclick to hide)
Escalade 2018 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
2018
Escalade ESV 2018 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
2018
XTS 2018 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
2018
Chevrolet 6 models(tapclick to expand)(tapclick to hide)
Corvette 2018-2019 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
2018 - 2019
Express 2500 2018 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
Base Extended Cargo Van 2018 V6 4.3L -
Base Extended Cargo Van 2018 V6 4.3L FLEX -
Base Standard Cargo Van 2018 V6 4.3L FLEX -
Base Standard Cargo Van 2018 V6 4.3L -
LS Standard Passenger Van 2018 V6 4.3L FLEX -
LS Standard Passenger Van 2018 V6 4.3L -
LT Standard Passenger Van 2018 V6 4.3L FLEX -
LT Standard Passenger Van 2018 V6 4.3L -
Applies to every configuration above: RWD | Automatic
Express 3500 2018 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
Base Cutaway Van 2018 V6 4.3L -
Base Cutaway Van 2018 V6 4.3L FLEX -
Base Extended Cargo Van 2018 V6 4.3L -
Base Extended Cargo Van 2018 V6 4.3L FLEX -
Base Standard Cargo Van 2018 V6 4.3L -
Base Standard Cargo Van 2018 V6 4.3L FLEX -
LS Extended Passenger Van 2018 V6 4.3L -
LS Extended Passenger Van 2018 V6 4.3L FLEX -
LS Standard Passenger Van 2018 V6 4.3L FLEX -
LS Standard Passenger Van 2018 V6 4.3L -
LT Extended Passenger Van 2018 V6 4.3L -
LT Extended Passenger Van 2018 V6 4.3L FLEX -
LT Standard Passenger Van 2018 V6 4.3L FLEX -
LT Standard Passenger Van 2018 V6 4.3L -
Applies to every configuration above: RWD | Automatic
Silverado 1500 2018 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
Custom Crew Cab Pickup 2018 V6 4.3L FLEX RWD/4WD | Automatic | For 2019 models, this fits the 'Classic' or 'Limited' body style (where mirrors mount in the window corner).
Custom Extended Cab Pickup 2018 V6 4.3L FLEX RWD/4WD | Automatic | For 2019 models, this fits the 'Classic' or 'Limited' body style (where mirrors mount in the window corner).
LS Crew Cab Pickup 2018 V6 4.3L FLEX RWD/4WD | Automatic | For 2019 models, this fits the 'Classic' or 'Limited' body style (where mirrors mount in the window corner).
LS Extended Cab Pickup 2018 V6 4.3L FLEX RWD/4WD | Automatic | For 2019 models, this fits the 'Classic' or 'Limited' body style (where mirrors mount in the window corner).
LS Standard Cab Pickup 2018 V6 4.3L RWD | Automatic | For 2019 models, this fits the 'Classic' or 'Limited' body style (where mirrors mount in the window corner).
LS Standard Cab Pickup 2018 V6 4.3L FLEX RWD/4WD | Automatic | For 2019 models, this fits the 'Classic' or 'Limited' body style (where mirrors mount in the window corner).
LT Crew Cab Pickup 2018 V6 4.3L FLEX RWD/4WD | Automatic | For 2019 models, this fits the 'Classic' or 'Limited' body style (where mirrors mount in the window corner).
LT Extended Cab Pickup 2018 V6 4.3L FLEX RWD/4WD | Automatic | For 2019 models, this fits the 'Classic' or 'Limited' body style (where mirrors mount in the window corner).
LT Standard Cab Pickup 2018 V6 4.3L FLEX RWD/4WD | Automatic | For 2019 models, this fits the 'Classic' or 'Limited' body style (where mirrors mount in the window corner).
WT Crew Cab Pickup 2018 V6 4.3L FLEX RWD/4WD | Automatic | For 2019 models, this fits the 'Classic' or 'Limited' body style (where mirrors mount in the window corner).
WT Extended Cab Pickup 2018 V6 4.3L FLEX RWD/4WD | Automatic | For 2019 models, this fits the 'Classic' or 'Limited' body style (where mirrors mount in the window corner).
WT Standard Cab Pickup 2018 V6 4.3L FLEX RWD/4WD | Automatic | For 2019 models, this fits the 'Classic' or 'Limited' body style (where mirrors mount in the window corner).
Suburban 2018 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
2018
Tahoe 2018 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
2018
GMC 5 models(tapclick to expand)(tapclick to hide)
Savana 2500 2018 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
Base Extended Cargo Van 2018 V6 4.3L FLEX -
Base Extended Cargo Van 2018 V6 4.3L -
Base Standard Cargo Van 2018 V6 4.3L FLEX -
Base Standard Cargo Van 2018 V6 4.3L -
LS Standard Passenger Van 2018 V6 4.3L FLEX -
LS Standard Passenger Van 2018 V6 4.3L -
LT Standard Passenger Van 2018 V6 4.3L -
LT Standard Passenger Van 2018 V6 4.3L FLEX -
Applies to every configuration above: RWD | Automatic
Savana 3500 2018 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
Base Cutaway Van 2018 V6 4.3L FLEX -
Base Cutaway Van 2018 V6 4.3L -
Base Extended Cargo Van 2018 V6 4.3L FLEX -
Base Extended Cargo Van 2018 V6 4.3L -
Base Extended Passenger Van 2018 V6 4.3L -
Base Extended Passenger Van 2018 V6 4.3L FLEX -
Base Standard Cargo Van 2018 V6 4.3L FLEX -
Base Standard Cargo Van 2018 V6 4.3L -
Base Standard Passenger Van 2018 V6 4.3L FLEX -
Base Standard Passenger Van 2018 V6 4.3L -
LS Extended Passenger Van 2018 V6 4.3L FLEX -
LS Extended Passenger Van 2018 V6 4.3L -
LS Standard Passenger Van 2018 V6 4.3L FLEX -
LS Standard Passenger Van 2018 V6 4.3L -
LT Extended Passenger Van 2018 V6 4.3L -
LT Extended Passenger Van 2018 V6 4.3L FLEX -
LT Standard Passenger Van 2018 V6 4.3L -
LT Standard Passenger Van 2018 V6 4.3L FLEX -
Applies to every configuration above: RWD | Automatic
Sierra 1500 2018 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
Base Crew Cab Pickup 2018 V6 4.3L FLEX -
Base Extended Cab Pickup 2018 V6 4.3L FLEX -
Base Standard Cab Pickup 2018 V6 4.3L FLEX -
SLE Crew Cab Pickup 2018 V6 4.3L FLEX -
SLE Extended Cab Pickup 2018 V6 4.3L FLEX -
SLE Standard Cab Pickup 2018 V6 4.3L FLEX -
Applies to every configuration above: RWD/4WD | Automatic | For 2019 models, this fits the 'Classic' or 'Limited' body style (where mirrors mount in the window corner).
Yukon 2018 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
2018
Yukon XL 2018 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
2018
Verify before ordering — please confirm your vehicle's year, make, model and sub-model specifications before placing your order. If anything is unclear, our customer service team is available to help.

Policies, in plain English.

Shipping & Handling

  • Standard shipping: 3-7 business days via UPS Ground
  • Parts are carefully packaged to prevent damage during transit

6-Month Warranty

All used parts include a 6-month warranty from the date of purchase.

  • If your part fails within 6 months, we will send a replacement
  • Refunds are only issued if we cannot provide a suitable replacement
  • Warranty covers defects — not installation errors, misuse, or damage after installation

Note: Warranty is for replacement, not refund. A part failing on day 80? We'll replace it. But the return window for refunds is 30 days.

Returns (30 Days)

We accept returns within 30 days of delivery for this part.

  • Defective parts: We will replace the part or issue a refund at our discretion
  • Electronic parts: Must be returned with the sealed inspection bag unopened. The clear bag allows full visual inspection before opening. Once opened, electronic parts can only be exchanged for a replacement if defective — no refunds
  • Programming: "Needs to be programmed to my vehicle" is not a valid return reason. Many modules require dealer programming — we're happy to help connect you with resources if your dealer says it's not programmable
  • Return shipping: We cover return shipping as part of our 100% money-back guarantee
  • Parts must be returned in original packaging and unmodified condition
  • Poorly packaged returns that arrive damaged will not be credited

Damaged in Shipping?

If your part arrives damaged:

  • Stop immediately — do not install the part
  • Keep all original packaging and boxes
  • Take clear photos of the damage and packaging
  • Contact us within 48 hours of delivery

We will handle the carrier claim. You are not responsible for shipping damage — we just need your help documenting it.

Order Cancellation

Orders can be cancelled before shipment for a full refund. Once shipped, cancellations follow our return policy.

Expert Guides

2018-2019 GM ECM Failure: Programming, Symptoms, and Replacement for Silverado, Escalade, Corvette & More

This guide covers the common failure symptoms and mandatory programming requirements for the engine control module (ECM) in many 2018-2019 GM trucks, SUVs, and cars.

 Read Full Guide →

Related Trouble Codes (OBD-II)

48 matching guides

If your scan tool is showing one of these trouble codes, this part is a common fix. Each guide explains the code, how to diagnose it, and exactly what to replace.

P0308
Why Your V6 is Showing a V8 Misfire Code
2013-2019 Cadillac XTS
 P0333
Knock Sensor Circuit High Causes and Fixes
2015-2020 Chevrolet Tahoe
 P0333
Knock Sensor Circuit Causes and Fixes
2014-2020 Gmc YUKON XL
 P0333
Knock Sensor Circuit High Causes & Fixes
2015-2019 Gmc YUKON DENALI
 P0601
Internal Control Module Failure Explained
2015-2018 Cadillac ESCALADE
 P0601
Internal ECM Memory Error Causes and Fixes
2015-2018 Chevrolet TAHOE
 P0601
ECM/TCM Failure Causes & Fixes
2015-2018 Chevrolet SILVERADO 1500
 P0601
Internal ECM Failure Causes and Fixes
2015-2018 Chevrolet SUBURBAN
 P0601
ECM Failure Causes and Fixes
2016-2018 Gmc SIERRA 1500
 P0601
Internal Module Failure Causes and Fixes
2015-2018 Gmc YUKON
 P0604
Internal RAM Error Causes & Fixes
2015-2018 Chevrolet SUBURBAN
 P0604
RAM Error Causes and Fixes
2015-2018 Chevrolet SILVERADO 1500
↑ A single part can trigger multiple related trouble codes. Each guide is vehicle- and code-specific.

Miscellaneous Information

OEM Part Numbers:
Other: 12673195, 12674052, 12674472, 12678815, 12678939, 12680656, 12686027, 12686382, 12686383, 12688528, 12691885, 12692069, 12695212, 12696364, 12696365

Fits Years: 2018 2019

Why Millions Choose Go-Parts

Your Go-To Place
for auto parts.

In operation since 2007. Trusted by over a million DIYers, mechanics, and body shops across all 50 states.

100%
Money-Back Guarantee

Shop With Total Confidence

Not happy with what arrived? 30-day returns, no-questions-asked refund. We make it right.

19
Years of Excellence

Trusted Since 2007

Nearly two decades of shipping parts to professionals & enthusiasts.

6MO
Warranty

Backed For The Long Haul

This part ships with a 6-month warranty. If it doesn't fit or stops working, we replace or refund — no hassle.

What buyers are saying.

★★★★★ 4.9 1,451 verified reviews

Racing Partner Videos

Racing partner video
Racing partner video
Racing partner video
Racing partner video
Added to cart · Part