Introducing our OEM Engine Computer, also known as the Engine Control Module (ECM), Engine Control Unit (ECU), or Powertrain Control Module (PCM), for the 1999 Silverado 1500 5.3L. This is a guaranteed direct replacement for all 1999 Silverado 1500 models equipped with the 5.3L engine and matching part number 09354896.

Programmed to Your VIN — Plug & Play

Every module ships fully programmed to your vehicle’s exact VIN with the latest factory software updates already installed — which enhances fuel economy and optimizes performance. It arrives ready to install with no dealer visit and no additional programming required. Simply plug it in and drive.

Tested In-House by Certified Technicians

Each unit is individually inspected, fully refurbished, and quality-control tested in-house by our ASE-certified technicians using off-board testing to meet or exceed OEM specifications. Our testing addresses common Silverado 1500 PCM issues including failure to start, intermittent starting, loss of power, no injector pulse, poor fuel economy, erratic shifting, and trouble codes.

Fitment: 1999 Silverado 1500 5.3L

Fits the 4.8L, 5.3L and 6.0L V8 with the Type A module, supporting the 4L60E/4L80E automatic transmission. Because every unit is VIN-programmed before shipping, it is an exact match for your specific vehicle. We’ll request your VIN at checkout.

Compatible Part Numbers

This module replaces the following OEM service and hardware numbers (found on the module sticker). Match the number on your existing unit to confirm fitment:

09354896, 09355699, 12200411, 12212156

Fast Shipping

Orders that finalize programming before 3:00 PM EST ship the same business day via free USPS Priority or UPS. Most units arrive within 1–3 business days.

Why Buy From Clifford Auto Parts

• Lifetime Warranty on every module
• Free US Shipping — no hidden fees
• No Core Charge — keep your old unit
• VIN-Programmed and updated, ready to install

Not sure if your part number matches? Call us at (516) 494-7838 and we’ll confirm the correct module for your exact vehicle in minutes.