Programmed 2003 Trailblazer EXT PCM 12582605 | Engine Control Module

Drive with Confidence Again

End the frustration of a faulty engine computer. This VIN-programmed PCM arrives ready to install, restoring the smooth performance and reliability you depend on. Eliminate guesswork and get back on the road with peace of mind. Get your direct-fit solution now!

$134.99

+11.99 USPS Priority Shipping

Out of stock

SKU: 590-07633-23 Categories: ,
Guaranteed Safe Checkout

Restore Peak Performance and Reliability to Your GM Truck or SUV

Is your GM truck or SUV suffering from frustrating engine issues, a persistent check engine light, or unpredictable performance? A failing Powertrain Control Module (PCM), the vehicle’s main computer, is often the culprit. It can disrupt everything from fuel economy and transmission shifting to starting and idling. This pre-programmed engine computer is the direct, reliable solution to get your vehicle running smoothly and dependably again, putting you back in control.

Common Symptoms & Your Solution

If you’re experiencing any of the following issues, a faulty PCM may be to blame. This unit is the definitive solution for problems such as:

  • Persistent Check Engine Light (CEL)
  • Diagnostic Trouble Codes (DTCs) like P0601, P0602, or P0606
  • Rough or erratic idling
  • Vehicle stalling or refusing to start
  • Poor fuel economy
  • Harsh or incorrect transmission shifting
  • Failure to pass emissions testing

Installing this precisely programmed module, like a 2003 Trailblazer EXT PCM, directly addresses the root cause of these electronic failures, restoring communication between your vehicle’s critical systems.

Features & Benefits

  • ✔ VIN-Programmed for You: Arrives at your door flashed with your vehicle’s specific VIN and the latest GM software updates. This critical step eliminates the need for an expensive trip to the dealership for programming.
  • ✔ Direct-Fit Replacement: Engineered as a precise match for a wide range of GM trucks and SUVs, ensuring a hassle-free installation. It correctly replaces service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802.
  • ✔ Restores Dependable Operation: Corrects common issues like rough idling, poor fuel mileage, and erratic shifting, bringing back the dependable performance you rely on for work and family.
  • ✔ Built for Durability: Constructed to meet or exceed original equipment specifications for long-lasting reliability, even in demanding driving conditions. A quality replacement for your original 2003 Trailblazer EXT PCM is essential for vehicle longevity.
  • ✔ Peace of Mind Guarantee: This unit is backed by our one-year replacement warranty.

An Expert’s Note: As a technician with over 20 years on the floor, I’ve seen countless headaches caused by improperly programmed modules. A generic ‘one-size-fits-all’ computer can create more problems than it solves. That’s why we insist on programming each PCM to your specific VIN. It ensures all systems—from the transmission to the anti-lock brakes—communicate correctly, just as the factory intended. This isn’t just a part; it’s a complete, vehicle-specific solution that provides a reliable, long-term fix for your 2003 Trailblazer EXT PCM and other compatible models.

Frequently Asked Questions

Do I need to do any programming myself?

No. This PCM arrives pre-programmed to the VIN you provide after purchase. It is ready for installation right out of the box, saving you time and money.

How do I provide my Vehicle Identification Number (VIN)?

After you complete your purchase, you will need to send us your 17-digit VIN. We will use this number to flash the module with the correct software for your specific vehicle before we ship it.

Will this fix my check engine light?

If the check engine light is on due to an internal fault in the original PCM (such as code P0601), this replacement unit is designed to correct that issue. However, if the light is on for another reason (e.g., a bad sensor), that separate issue will still need to be addressed.

Is a security relearn procedure required after installation?

In many cases, a simple security relearn procedure (often called a ‘key relearn’) is required after installation. This procedure is straightforward, takes about 30 minutes, and can be done without any special tools. Instructions are readily available online for your specific GM model.

Where is the PCM located on my vehicle?

On most of the compatible GM trucks and SUVs listed, the PCM is located in the engine bay, on the driver’s side, next to the battery or air filter box. Always disconnect the battery before attempting removal or installation.

MPN

12582605

Year

Conditions & Options

12589463

Genuine OEM

Yes

Condition

Refurbished

PartNumber

590

Model

TRAILBLAZER EXT

Make

Year

2004

Brand

CHEVROLET TRUCK

Manufacturer Part Number

Interchange part number

Scroll to Top