2003 Blazer S10 PCM 12570557 | Programmed to Your VIN

End Your Drivability Headaches

Get your 2003 Blazer, Jimmy, or S10 running right again with this fully programmed Powertrain Control Module (PCM). We flash it with the latest GM software using your VIN, so it arrives ready to install, saving you a costly trip to the dealer. This is the direct solution for common issues like stalling, no-starts, and poor fuel economy. Order today for a fast, reliable fix!

$98.95

+11.99 USPS Priority Shipping

Availability: In stock



SKU: 590-06724-14 Categories: ,
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Restore Peak Performance to Your GM Vehicle

Is your 2003 Chevy Blazer, S10, or GMC Jimmy S15 suffering from frustrating and unpredictable issues? A failing Powertrain Control Module (PCM) is often the culprit behind problems that can leave you stranded. As the brain of your vehicle, the PCM controls everything from fuel mixture and spark timing to transmission shifting. When it falters, the symptoms can be widespread and difficult to diagnose. This replacement PCM, part number 12570557, is the definitive solution to get your truck running reliably again.

With over two decades of hands-on diagnostic experience, I’ve seen countless vehicles sidelined by faulty engine computers. The key to a lasting repair isn’t just swapping the part—it’s ensuring the replacement is correctly programmed with the most current software for your specific vehicle. That’s why we take the extra step to flash this module with the latest GM updates, using your vehicle’s VIN. This eliminates the need for an expensive trip to the dealership for programming, making it a true plug-and-play solution for both seasoned mechanics and DIY enthusiasts.

A Technician’s Notebook: The Intermittent No-Start

I remember a 2003 GMC Sonoma with the 4.3L V6 that came into the shop on a tow truck. The owner was frustrated; he’d replaced the battery, alternator, and starter, but the truck would still randomly refuse to start. It had no spark and no fuel injector pulse, but only sometimes. After ruling out the usual suspects, I hooked up my scope to the PCM. The issue was a failing ignition driver circuit inside the module itself. Heat soak was causing an internal failure that wouldn’t always set a trouble code. We installed a VIN-programmed PCM just like this one, and the truck fired up instantly. It’s a classic failure mode for these units, and this module is the correct, permanent fix.

Is Your Truck or Van Showing These Signs?

A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your engine computer needs attention. Replacing your faulty module can resolve these common issues:

  • ✔ Check Engine Light is on with communication-related or internal processor fault codes (e.g., P0601, P0606).
  • ✔ Vehicle will not start or has a hard-starting condition.
  • ✔ Engine stalls unexpectedly while driving or at idle.
  • ✔ Noticeable decrease in fuel economy.
  • ✔ Rough or erratic engine idling.
  • ✔ Harsh or incorrect automatic transmission shifting.
  • ✔ Failure to pass state emissions testing.

A Straightforward Guide to Installation

Installing your new 2003 Blazer S10 PCM is a manageable job for most DIYers. For the Blazer, S10, Jimmy, and Sonoma, the module is located in the right-front of the engine compartment, near the coolant overflow tank.

  1. Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
  2. Locate the PCM: Find the module in the engine bay. It’s a silver metal box with several large electrical connectors.
  3. Disconnect Connectors: Carefully unlatch and remove all electrical harness connectors from the old PCM. These connectors have locking tabs that must be released before pulling.
  4. Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
  5. Install the New Module: Seat the new, pre-programmed PCM into the mounting bracket and secure it with the original bolts.
  6. Reconnect Everything: Firmly plug the electrical connectors into the new module until they click and lock into place. Reconnect the negative battery terminal.
  7. Final Step: In many cases, you may need to perform a security relearn procedure to sync the new PCM with your vehicle’s anti-theft system. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating two more times before starting the engine.

Verified Vehicle Compatibility

This module is a direct replacement for a wide range of GM vehicles. Please verify your vehicle is on this list and that your original part carries one of the compatible service numbers. Providing your VIN at checkout guarantees we send you a correctly programmed module.

  • ✔ ASTRO 03: Electronic Control Module; (LH front by battery)
  • ✔ AVALANCHE 2500 03: Electronic Control Module; (LH front under battery)
  • ✔ BLAZER S10/JIMMY S15 03: Electronic Control Module; (RH front engine compartment)
  • ✔ CTS 04: Electronic Control Module; (RH engine compartment), Base, ID 12581565
  • ✔ CORVETTE 04: Electronic Control Module; (RH engine compartment), ID 12581565
  • ✔ EXPRESS 1500/2500/3500 VAN 03: Electronic Control Module; (LH rear engine compartment)
  • ✔ S10/S15/SONOMA 03: Electronic Control Module; (RH front engine compartment), 4.3L
  • ✔ SAFARI (GMC) 03: Electronic Control Module; (LH front by battery)
  • ✔ SAVANA 1500/2500/3500 VAN 03: Electronic Control Module; (LH rear engine compartment)
  • ✔ SIERRA 1500 PICKUP 03: Electronic Control Module; (LH front under battery), w/4.3L
  • ✔ SIERRA 2500/3500 PICKUP 03: Electronic Control Module; (LH front under battery), gasoline, 8.1L
  • ✔ SILVERADO 2500/3500 PICKUP 03: Electronic Control Module; (LH front under battery), gasoline, 8.1L
  • ✔ SUBURBAN 2500 03: Electronic Control Module; (LH front under battery), 8.1L
  • ✔ YUKON XL 2500 03: Electronic Control Module; (LH front under battery), 8.1L

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

Frequently Asked Questions

Frequently Asked Questions

Do I need to send my old computer (core) back?

No core charge or return is required for this part. You can keep or recycle your old module.

Is this module truly ‘plug and play’?

Yes, it comes programmed to your VIN with the latest GM software. In most cases, you will only need to perform a simple security relearn procedure after installation, which does not require any special tools.

What happens after I purchase?

After you complete your purchase, you will need to send us your vehicle’s 17-digit VIN. We cannot program and ship the module without it. This ensures perfect compatibility.

Will this fix my transmission shifting problems?

The PCM also controls transmission functions. If your shifting issues are caused by faulty electronic signals from a failing computer, this part will resolve them.

What if my original part number is not on the list?

The listed service numbers cover a wide range of original parts. As long as your vehicle model and year are listed in the compatibility chart, this module will function correctly once programmed to your VIN.

How do I find my VIN?

Your VIN can be found on your vehicle’s registration, insurance card, or on a metal plate on the driver’s side of the dashboard, visible through the windshield.

Conditions & Options

Programmed to your VIN GM: 12576106

Year
Genuine OEM

Yes

MPN

12570557

Interchange part number

Condition

Refurbished

Model

blazer-s10-jimmy-s15

Year

2003

Brand

GM

Manufacturer Part Number

, , , , , , , , ,

GTIN

Does not apply

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