2003 Silverado 3500 Engine Control Module IS 8125815650 Programmed To Your VIN VIN PCM ECM ECU

Restore Your Truck’s Performance!

Get your 2003 Silverado 3500 back on the road fast with our VIN-programmed powertrain control module. This direct-fit replacement arrives with the latest GM software, ready for a straightforward installation. Simply provide your VIN and let us handle the complex programming. Order today to restore peak engine operation!

$134.95

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Is Your 2003 Silverado 3500 Running Rough? The PCM Might Be the Culprit.

Your 2003 Chevrolet Silverado 3500 is a workhorse, but when its central computer starts to fail, it can bring your projects to a grinding halt. The Powertrain Control Module (PCM), also known as the Engine Control Module (ECM), is the electronic brain responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions control. A faulty PCM can cause a cascade of confusing and frustrating problems, leaving you stranded and searching for a reliable solution.

This isn’t just another part. This is a direct-fit replacement PCM for your vehicle, delivered to your door already programmed with the latest official GM software updates. We take the guesswork and the expensive trip to the dealership out of the equation. By providing us with your vehicle’s VIN during checkout, you receive a module that is specifically calibrated for your truck’s exact configuration, ensuring a seamless installation and restoration of factory performance.

From the Diagnostic Bay

We had a 2003 Sierra 2500 with the 8.1L V8 come in on the hook. The customer had replaced the fuel pump and all the spark plugs, but it still had an intermittent no-start and would randomly stall. The check engine light was on with a slew of communication codes. After checking all the main power and ground circuits to the PCM—which were solid—we connected our scan tool and found we couldn’t communicate with the module consistently. It was dropping offline. We swapped in one of our pre-programmed modules, performed the security relearn, and the truck fired up instantly and ran perfectly. It’s a classic case of internal PCM failure that can mimic a dozen other problems.

Symptoms of a Failing Powertrain Control Module

If you’re experiencing any of the following issues, a failing PCM could be the root cause. Confirming these symptoms can help you make an accurate diagnosis and get the right part the first time.

  • ✔ Unexplained Check Engine Light (CEL) illumination, especially with U-series communication codes.
  • ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
  • ✔ Harsh or erratic automatic transmission shifting.
  • ✔ A complete no-start condition where the engine cranks but won’t fire.
  • ✔ Noticeable decrease in fuel economy.
  • ✔ Failure to pass an emissions test.
  • ✔ Intermittent issues that get worse as the engine warms up.

The Critical Role of VIN Programming for Your 2003 Silverado 3500 PCM

In modern vehicles, the PCM is not a simple plug-and-play component. It’s integrated with your truck’s security system (Passlock/VATS) and contains specific calibrations for your engine, transmission, and emissions equipment. Installing a non-programmed module from a salvage yard will result in a no-start condition every time. Our service eliminates this barrier. We use your VIN to flash the module with the correct software, making the installation process as simple as possible. Once installed, you will typically only need to perform a simple security relearn procedure, which can be done without any special tools.

This module is a direct replacement for multiple GM service numbers, ensuring wide compatibility. Please verify your part number against the list below to confirm fitment.

Compatible Service Numbers: 12581565, IS 8125815650, 12570557, 12570558, 12576106, 12576869, 12578127, 8125781270, 88864822, 89017733

Broad Vehicle Compatibility: While this is the ideal solution for your Silverado, this PCM also fits a wide range of other 2003-2004 GM vehicles, including the Sierra, Suburban 2500, Yukon XL 2500, Avalanche 2500, Express/Savana vans, and more. Always match your service number to ensure proper fitment.

Frequently Asked Questions

Do I need to have this PCM programmed?

No, we handle the programming for you before shipment. You must provide your vehicle’s 17-digit VIN when you place your order so we can load the correct GM-certified software for your specific truck.

What do I need to do after I install the module?

After installation, you will need to perform a security relearn procedure, also known as a VATS relearn. This syncs the new PCM with your vehicle’s anti-theft system. The procedure typically takes about 30 minutes and can be done without any special tools. Instructions are readily available online or can be provided upon request.

Where is the PCM located on my 2003 Silverado 3500?

On most 2003 GM trucks like the Silverado and Sierra, the PCM is located in the engine bay on the driver’s side, mounted to a bracket underneath or near the battery tray.

Is this a new or used part?

This is a high-quality, fully tested replacement part that has been meticulously inspected and prepared to meet or exceed original equipment standards. It is programmed with the latest software available from GM for your vehicle.

Will this fix my transmission shifting problems?

The PCM controls both engine and transmission functions. If your shifting problems are caused by faulty electronic signals or a failing module, then replacing the PCM will likely resolve the issue. However, harsh shifting can also be caused by mechanical problems within the transmission itself.

Conditions & Options

Programmed to your VIN GM: 12576106

Year

Genuine OEM

Yes

MPN

is-8125815650

Interchange part number

Condition

Refurbished

Model

Silverado 3500

Year

2003

Brand

GM

Manufacturer Part Number

, , , , , , , , ,

GTIN

Does not apply

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