12703878 | 2019 Chevrolet Silverado 5.3L PCM Engine Computer Programmed

12703878 | 2019 Chevrolet Silverado 5.3L PCM Engine Computer Programmed

Chevrolet

$260.00 USD
$260.00 USD

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Rebuilt 2019 Chevrolet Silverado Powertrain Control Module (PCM), also referred to as an Engine Control Module (ECM) or Engine Control Unit (ECU), is a certified OEM replacement designed for all 2019 Chevrolet Silverado models equipped with a 5.3L engine and matching part number 12703878.

REBUILT PCM / ECM / ECU ORIGINAL MANUFACTURED (OEM)

The Engine Computer, also referred to as the Powertrain Control Module (PCM), Engine Control Module (ECM), or Engine Control Unit (ECU), manages ignition timing, fuel injection, and overall engine performance. A faulty module can cause starting issues, poor fuel economy, or check engine lights. Each unit is VIN-programmed, bench-tested, and guaranteed to meet OEM specifications.

  • Pre-programmed to your vehicle’s VIN for Plug-and-Play installation
  • Flashed with the latest GM factory updates for improved fuel economy and optimized power
  • Bench-tested by professional technicians to meet OEM performance standards
  • No additional programming required — ready to install

INTERCHANGEABLE PART NUMBERS

Each PCM is verified against your VIN and hardware code to ensure 100% compatibility. The module you receive may vary slightly in appearance but will be fully functional and OEM-matched.

PART NUMBER:

12703878

HARDWARE CODE:

12703872

FITMENT

Compatible Vehicle Applications:

  • Chevrolet Silverado 1500 (2019) — 5.3L V8 Engine
  • 100% compatible with all factory-installed 5.3L PCM / ECM / ECU units using part number 12703878

CORE POLICY

  • NO CORE RETURN / CHARGE: No core fee or return required for your original PCM
  • BUYBACK PROGRAM: Optional cash or store credit for your original core (upon request)

Shipping

DOMESTIC (CANADA & USA)

  • Free shipping across Canada and the United States
  • No sales and import/export customs tax within United States
  • Transit time 2–5 days (holidays and weekends excluded) after order is completed
  • Overnight delivery available at extra cost
  • Shipping partners include UPS, FedEx, DHL, Purolator, and Postal

INTERNATIONAL (OUTSIDE OF NORTH AMERICA)

  • Flat rate of minimum $75 shipping charge applies to all international orders
  • All return shipping charges for international orders are the customer’s responsibility — NO EXCEPTIONS

Installation Guide

INSTALLATION RESOURCES
Ready to install? Installation is straightforward and usually takes about 20 minutes. Doing it yourself can save you hundreds, and our resources make the process hassle-free. Follow the link below.

Installation Link

LIVE TECHNICAL SUPPORT
Still have questions? Talk to a real expert today and get the answers you need.

Warranty and Returns

WARRANTY AND RETURNS COVERAGE

Auto Engineer includes a Free 1-Year limited warranty on all new, rebuilt items, and repair services, with the option to extend coverage up to 3 years for an additional cost. Warranty replacements carry a 90-day coverage period, applying only to the repaired or replaced portion of the unit. Damage from accidents, misuse, improper installation, tampering, or environmental factors is excluded, and costs such as labor, towing, or rentals are not covered. Claims require proof of purchase and inspection before approval, and service is limited to repair or replacement at our discretion. Refunds are only issued if a repair cannot be completed, and a diagnostic fee may apply for unrepairable units. Customers in Canada and the United States receive free shipping on warranty service, while international customers are responsible for shipping and related fees. All returns must be pre-authorized, with unauthorized or refused shipments subject to restocking, and original shipping charges are non-refundable. If you’d like to know more, please check our Warranty and Returns Policy.

RENTAL COVERAGE

If you purchase a module and later find the issue was elsewhere and the module was only needed for troubleshooting, Auto Engineer allows you to convert your purchase into a rental within 30 days. For details, see our Warranty and Returns Policy.
12703878 | 2019 Chevrolet Silverado 5.3L PCM Engine Computer Programmed

$260.00 USD

What does the Engine Computer (ECM/PCM/ECU) do?

The Engine Computer, also called the ECM, PCM, or ECU, is the central control unit of your vehicle’s engine and powertrain. It manages fuel injection, ignition timing, emissions, and other key functions to ensure optimal performance, fuel efficiency, and reliability. Without a properly working ECM, the engine cannot operate correctly.

Can my existing ECM be restored or cloned to another ECM?

In many cases, yes. If your original ECM is still readable, its data and configuration file can often be extracted and cloned onto another ECM. This process restores your vehicle’s original settings, VIN, and security information, allowing the replacement unit to function as if it were the factory-installed module. If the ECM is too badly damaged or the file is corrupted, a fresh programming service may be required instead.

If my ECM cannot be repaired, can a replacement be provided?

Yes. If your ECM cannot be successfully repaired, we can supply a compatible rebuilt OEM replacement. The replacement will be programmed or cloned to your vehicle’s VIN and configuration to ensure proper fit and function.

How long does the ECM service take?

Service times vary depending on the condition of the module and the type of work required. In most cases, ECM services are completed the same day, with a typical turnaround of 1–3 business days at the latest. Fulfillment may take longer if a donor ECM needs to arrive for cloning, or if a replacement ECM is temporarily out of stock.

Where is the Engine Computer (ECM/PCM/ECU) located?

The location of the engine computer depends on the make and model of your vehicle. In most vehicles, the ECM/PCM/ECU is mounted in the engine bay near the fuse box or firewall. Some vehicles place it under the dashboard, beneath the passenger-side kick panel, or near the battery tray. Always consult your service manual for the exact location, as placement varies between manufacturers and model years.