Programmed 2003 Sierra 3500 Pickup PCM 88864822 | VIN Matched

End Your Truck’s Electrical Headaches

Solve persistent running problems with our VIN-programmed Powertrain Control Module for your 2003 GM truck. This PCM arrives with the latest factory software, ready for installation right out of the box. It’s the reliable, direct-fit solution to restore performance and eliminate frustrating check engine lights without a trip to the dealer. Order now to get your vehicle running smoothly again!

$98.95

+11.99 USPS Priority Shipping

Availability: In stock



SKU: 590-06724-155 Categories: ,
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Restore Your Truck’s Brain and Get Back on the Road

If you’re dealing with frustrating issues like a persistent check engine light, poor fuel mileage, rough idling, or even a no-start condition in your 2003 GMC Sierra 3500, the problem often lies with a failing Powertrain Control Module (PCM). As a technician with over two decades of experience under the hood, I’ve seen firsthand how a faulty PCM can cause a cascade of baffling electronic problems. This isn’t just a part; it’s the central computer of your vehicle, managing everything from fuel injection and spark timing to transmission shifting. When it fails, your truck simply can’t operate as it should.

This replacement PCM is the definitive solution. We take the guesswork and hassle out of the repair by pre-programming the module specifically for your truck using your Vehicle Identification Number (VIN). This means it arrives at your door with the latest GM factory software updates already installed, ready for a straightforward installation. You get a reliable, effective repair without the costly trip to the dealership for programming. This is the same process we use in the shop to ensure a first-time fix for our customers.

Case Study: A Tricky Diagnosis

I remember a 2003 Silverado 2500 with the 8.1L that came into the bay with an intermittent no-start. The owner had already replaced the battery and starter. It would crank but wouldn’t fire, and then an hour later, it would start perfectly. There were no consistent trouble codes, just a generic U0100 ‘Lost Communication with ECM/PCM’ that would pop up occasionally. After checking all the power and ground circuits to the module, we noticed that a gentle tap on the PCM housing would sometimes cause the engine to stumble. This is a classic sign of internal circuit board failure, often from years of heat cycles and vibration. We installed a VIN-programmed 2003 Sierra 3500 PCM, performed the security relearn, and the truck fired up every single time. It’s a textbook example of how this single component can be the root of very elusive problems.

Common Signs of a Failing PCM

A failing engine computer can manifest in numerous ways. If your vehicle is experiencing any of the following, a faulty PCM could be the culprit:

  • ✔ Check Engine Light is illuminated with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
  • ✔ The engine cranks but refuses to start.
  • ✔ Noticeable decrease in fuel economy.
  • ✔ The transmission is shifting erratically or harshly.
  • ✔ Stalling, stumbling, or hesitation during acceleration.
  • ✔ Communication errors with your scan tool.

A Straightforward Guide to Installation

Replacing the PCM is a job most DIYers can handle with basic tools. This module is typically located in the engine bay on the driver’s side, under or near the battery. Following these steps will ensure a smooth installation.

  1. Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
  2. Locate the PCM: On most 2003 GM trucks and vans, it’s under the battery tray on the driver’s side. You may need to remove the battery to access it.
  3. Disconnect Connectors: Carefully unplug the electrical harness connectors from the old PCM. There are typically release tabs that need to be pressed or lifted. Avoid forcing them.
  4. Remove Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
  5. Install New Module: Mount the new, pre-programmed PCM securely in place and reconnect the electrical harnesses. Ensure they click into place.
  6. Reconnect Battery: Reinstall the battery (if removed) and reconnect the negative battery terminal.
  7. Perform Security Relearn: This is a critical step. You must perform the GM Security Relearn Procedure to sync the new PCM with your vehicle’s anti-theft system. This procedure typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating the cycle two more times. Your vehicle will not start until this is completed.

Will This Fit My Vehicle?

This Powertrain Control Module is a direct-fit replacement for a wide range of 2003 and 2004 GM vehicles. Please verify your model and engine options below. This part replaces service numbers: 12581565, 8125815650, 12570557, 12570558, 12576106, 12576869, 12578127, 8125781270, 88864822, 89017733.

  • 2003 Avalanche 2500
  • 2003 Astro / Safari
  • 2003 Blazer S10 / Jimmy S15
  • 2004 Cadillac CTS (Base, ID 12581565)
  • 2004 Corvette (ID 12581565)
  • 2003 Express / Savana Van (1500, 2500, 3500)
  • 2003 S10 / Sonoma (4.3L)
  • 2003 Sierra / Silverado 1500 (4.3L)
  • 2003 Sierra / Silverado 2500 & 3500 (Gasoline, 8.1L)
  • 2003 Suburban / Yukon XL 2500 (8.1L)

Frequently Asked Questions

How do I provide my VIN for programming?

After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship your order until we receive this information, as the programming is specific to your truck.

Is this part difficult to install?

No, the physical installation is straightforward for someone with basic mechanical skills. The most important part is performing the security relearn procedure after installation, which does not require special tools.

Will this fix my check engine light?

If the check engine light is caused by an internal failure of the PCM (like code P0601), then yes, this part will resolve the issue. It’s crucial to properly diagnose the problem first, as other sensors or wiring issues can also trigger a check engine light.

What is the GM Security Relearn Procedure?

It’s a required process that allows your vehicle’s anti-theft system to recognize the new PCM. It typically involves cycling the ignition key on and off in 10-minute intervals three times. We include general instructions, but you can also easily find vehicle-specific videos online.

Does this part come with a warranty?

Yes, all our electronic modules come with a warranty against defects. Please refer to the warranty information tab on the product page for complete details and duration.

Conditions & Options

Programmed to your VIN GM: 12576106

Year
Genuine OEM

Yes

MPN

88864822

Interchange part number

Condition

Refurbished

Model

Sierra 3500 Pickup

Year

2003

Brand

GM

Manufacturer Part Number

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GTIN

Does not apply

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