Programmed 2003 Sierra 2500 PCM 12576106 | VIN Matched & Updated

End Your Truck’s Electrical Headaches.

Stop chasing ghosts in your electrical system. This Powertrain Control Module for your 2003 Sierra 2500 comes fully programmed to your vehicle’s VIN with the latest GM software. It’s the definitive fix for common issues like no-starts, erratic performance, and false check engine lights. Get a reliable, plug-and-play solution delivered to your door. Order today to restore your truck’s performance!

$98.95

+11.99 USPS Priority Shipping

Availability: In stock



SKU: 590-06724-51 Categories: ,
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Restore Your Truck’s Brain and Get Back on the Road

If you’re dealing with baffling electrical gremlins, a no-start condition, or a persistent Check Engine Light on your 2003 GMC Sierra 2500, the Powertrain Control Module (PCM) is often the culprit. As a mechanic with over two decades of diagnostic experience, I’ve seen firsthand how a failing PCM can mimic a dozen other problems, leading to wasted time and money on unnecessary parts. This isn’t just a component; it’s the central computer for your engine and transmission, and when it fails, your truck’s performance and reliability go with it.

We offer a dependable solution: a replacement PCM, part number 12576106, that arrives at your door fully programmed to your truck’s specific Vehicle Identification Number (VIN). We load it with the latest official GM software updates, which often correct factory-level drivability issues. This eliminates the need for expensive dealership programming, making it a direct-fit, effective fix for both professional technicians and dedicated DIYers.

Case Study: A Tricky Diagnosis

A customer brought in a 2003 Silverado 2500 with the 8.1L engine, a cousin to the Sierra. The complaint was an intermittent no-start and a random stalling issue that no one could figure out. The parts cannon had already been fired at it: new crank sensor, new fuel pump, even a new ignition switch. The problem persisted. When I connected my scanner, I saw intermittent communication loss with the module (a classic U-code). After verifying the wiring and grounds were solid, we pinpointed the PCM. A microscopic crack in the circuit board, likely from years of heat cycles and vibration, was causing the intermittent failure. Installing a properly programmed PCM like this one solved the issue instantly. The customer was back to work the next day, his truck running better than it had in years.

Is Your GM Truck or Van Showing These Symptoms?

A failing PCM can cause a wide array of issues. If you’re experiencing any of the following, this module is a likely solution. I’ve personally diagnosed these symptoms hundreds of times, often tracing them back to an internal PCM fault.

  • ✔ Check Engine Light is on with communication-related or internal processor codes (e.g., P0601, P0606, U0100).
  • ✔ Engine cranks but will not start.
  • ✔ Harsh or erratic automatic transmission shifting.
  • ✔ A noticeable drop in fuel economy for no apparent reason.
  • ✔ The engine stalls unexpectedly while driving or at idle.
  • ✔ Apparent failure of multiple sensors at the same time.
  • ✔ The cooling fans run constantly or not at all.

A Straightforward Guide to Installation

Replacing the PCM is a manageable job for most DIYers with basic hand tools. The key is our pre-programming service, which handles the most complex part for you. While a security relearn procedure may be necessary, it doesn’t require special tools.

  1. Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
  2. Locate the PCM: On most trucks like the Sierra/Silverado, the PCM is located under the hood on the driver’s side, near the battery, often in a black plastic bracket. On vans like the Express/Savana, it’s typically in the LH rear of the engine compartment.
  3. Disconnect Connectors: Carefully unlatch and remove the electrical harness connectors from the old PCM. These connectors have locking tabs, so be gentle to avoid damage.
  4. Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
  5. Install the New Module: Seat your new, pre-programmed PCM into the bracket and secure it. Reconnect the electrical harnesses, ensuring they click firmly into place.
  6. Reconnect Battery: Reattach the negative battery terminal.
  7. Perform Security Relearn: In many cases, you will need to perform a security or anti-theft relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating this cycle three times. Consult your vehicle’s service information for the exact procedure.

Verified Vehicle Compatibility

This module is a direct replacement for service number 12576106 and is compatible with a wide range of GM vehicles. Please verify your part number and application from the list below. Providing your VIN at checkout is essential for us to ensure perfect programming and compatibility.

  • Chevrolet Avalanche 2500: 2003
  • Chevrolet Blazer / GMC Jimmy S-Series: 2003
  • Chevrolet Corvette: 2004 (Base, ID 12581565)
  • Chevrolet Express / GMC Savana Vans (1500, 2500, 3500): 2003
  • Chevrolet S10 / GMC Sonoma: 2003 (4.3L)
  • Chevrolet Silverado / GMC Sierra Pickup (1500, 2500, 3500): 2003 (Gasoline Engines, including 4.3L & 8.1L)
  • Chevrolet Suburban 2500 / GMC Yukon XL 2500: 2003 (8.1L)
  • Chevrolet Astro / GMC Safari: 2003
  • Cadillac CTS: 2004 (Base, ID 12581565)

Do I need to do any programming myself?

Do I need to do any programming myself?

No. We handle all the programming before we ship the part. We flash the module with the latest GM software updates using the VIN you provide during checkout. This ensures it’s ready for installation right out of the box.

What is the VIN and why do you need it?

The VIN (Vehicle Identification Number) is your car’s unique 17-digit serial number. It contains critical information about your vehicle’s specific options, engine, transmission, and emissions equipment. We use it to load the exact correct software for your truck, guaranteeing compatibility.

Is a security relearn procedure required?

Yes, in most cases you will need to perform a simple security relearn procedure after installation. This syncs the new PCM with your vehicle’s anti-theft system. It’s a straightforward process that does not require any special scan tools and can be done in your driveway.

Will this fix my transmission shifting problems?

The PCM controls both the engine and the transmission. If your shifting issues are caused by faulty electronic commands from a failing module, then yes, this part will resolve them. It’s a very common symptom of a bad PCM in these GM trucks and vans.

How do I match my part number?

This module, 12576106, replaces several service numbers including 12581565, 12570557, 89017733, and others listed in our description. As long as your vehicle is on the compatibility list, providing us with your VIN is the most accurate way to ensure a perfect match.

Conditions & Options

Programmed to your VIN GM: 12576106

Year
Genuine OEM

Yes

MPN

12576106

Interchange part number

Condition

Refurbished

Model

Sierra 2500 Pickup

Year

2003

Brand

GM

Manufacturer Part Number

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GTIN

Does not apply

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