Programmed 2003 Silverado 1500 PCM 12578127 | VIN Matched & Updated

Restore Your Truck’s Performance!

Fix check engine lights, poor running conditions, and no-start issues with this VIN-programmed Powertrain Control Module for your 2003 GM vehicle. It arrives with the latest software, ready for a simple, plug-and-play installation. Get back on the road fast!

$98.95

+11.99 USPS Priority Shipping

Availability: In stock



SKU: 590-06724-96 Categories: ,
Guaranteed Safe Checkout

Is Your Truck Running Rough? Get a Reliable, Programmed Solution.

If you’re dealing with a persistent check engine light, poor fuel economy, erratic shifting, or even a no-start condition in your 2003 GM truck or van, a failing Powertrain Control Module (PCM) is often the culprit. Over my 20+ years in the shop, I’ve seen countless vehicles sidelined by faulty engine computers. This isn’t just an inconvenience; it’s a critical failure that affects every aspect of your vehicle’s performance and safety. This replacement PCM, part number 12578127, is the definitive solution to get your vehicle running like new again.

The Critical Advantage: VIN-Programmed with the Latest GM Software

Don’t waste time and money on a trip to the dealership. We handle the complex programming for you. Before we ship your module, our technicians will use the Vehicle Identification Number (VIN) you provide to flash this PCM with the most current, stable software directly from General Motors. This ensures perfect compatibility with your vehicle’s specific options and systems, restoring factory performance and efficiency right out of the box.

Expert Pro Tip: Check for Harness Damage Before Installation

On many of these GM trucks, like the Silverado and Sierra, the PCM is located under the battery tray. Over the years, battery acid can leak and corrode not just the PCM case, but also the wiring harness connectors. Before you install your new module, take five minutes to carefully inspect the harness plugs for any green or white crusty buildup (corrosion) or chafed wires. Clean the connectors with a dedicated contact cleaner and a small brush. A poor connection is one of the most common reasons for a replacement module to not function correctly, and this simple check can save you hours of diagnostic headaches.

Is a Failing PCM Causing Your Problems?

A bad engine computer can manifest in numerous ways. Here are some of the most common symptoms I’ve diagnosed that point directly to a faulty module:

  • โœ” Persistent Check Engine Light (CEL) with various communication or processor codes.
  • โœ” Vehicle won’t start or dies intermittently.
  • โœ” Noticeable drop in fuel mileage.
  • โœ” Harsh or incorrect automatic transmission shifting.
  • โœ” Engine misfires, stumbles, or runs poorly.
  • โœ” Failure to communicate with a diagnostic scan tool.

Simple, Direct-Fit Installation Guide

Installing your new 2003 Silverado 1500 PCM is a straightforward process you can do at home. While locations vary slightly by model (e.g., under the battery on trucks, in the engine compartment on vans), the general steps are the same.

  1. Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
  2. Locate the Module: On most 2003 Silverado/Sierra models, the PCM is located on the driver’s side, under the battery and battery tray. You will need to remove both to gain access.
  3. Disconnect Connectors: Carefully unclip and remove the electrical harness connectors from the old PCM. Inspect them for damage as noted in our Pro Tip.
  4. Remove Old PCM: Unbolt the old module from its mounting bracket.
  5. Install New PCM: Mount your new, pre-programmed module in place and securely fasten it.
  6. Reconnect Everything: Plug the harness connectors firmly into the new PCM until they click. Reinstall the battery tray and battery, then reconnect the negative battery terminal.
  7. Final Step: In some cases, a security relearn procedure may be required. This can typically be done by turning the key to the ‘ON’ position for 10-15 minutes. Your vehicle is now ready to start.

Guaranteed Compatibility

This module is a direct replacement for a wide range of GM vehicles and is compatible with the following service part numbers: 12581565, IS 8125815650, 12570557, 12570558, 12576106, 12576869, 12578127, 8125781270, 88864822, and 89017733. It fits many 2003-2004 GM models including the Silverado, Sierra, Suburban, Yukon, Avalanche, Express, Savana, and more. Please verify your part number or consult the fitment list to ensure this is the correct part for your application.

Conditions & Options

Programmed to your VIN GM: 12576106

Genuine OEM

Yes

MPN

12578127

Interchange part number

Condition

Refurbished

Model

Silverado 1500 Pickup

Year

2003

Brand

GM

Manufacturer Part Number

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GTIN

Does not apply

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