2003 Astro Powertrain Module 12581565 | Programmed to Your VIN

End Your Van’s Engine Headaches.

Tired of a rough idle, poor performance, or a stubborn check engine light on your 2003 Astro or other GM vehicle? This Powertrain Control Module (PCM) is the solution. It arrives pre-programmed to your vehicle’s VIN with the latest GM software, making installation simple and straightforward with no dealer visit required. Restore your engine’s performance and reliability. Order today to get back on the road fast!

$98.95

+11.99 USPS Priority Shipping

Availability: In stock



SKU: 590-06724-122 Categories: ,
Guaranteed Safe Checkout

Restore Your GM Vehicle’s Core Performance and Reliability

As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing Powertrain Control Module (PCM) can turn a dependable vehicle into a source of constant frustration. If your 2003 Chevy Astro, Express van, or other compatible GM truck is suffering from baffling engine issues, erratic shifting, or a persistent Check Engine light, the PCM is often the culprit. This isn’t just a part; it’s the brain of your vehicle’s operation, and getting it right is critical. That’s why we offer this direct-fit 2003 Astro Powertrain Module, professionally programmed with the latest GM software specifically for your vehicle’s VIN.

Forget the expensive trip to the dealership and the hassle of coordinating programming. We handle the complex part for you. Simply provide your VIN after purchase, and we’ll flash the module so it arrives ready for installation. This ensures all factory parameters for your engine and transmission are perfectly restored, solving those hard-to-diagnose drivability problems and getting you back on the road with confidence.

Is Your Vehicle Showing These Symptoms?

  • ✔ Unexplained Check Engine Light with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (PCM Processor Fault).
  • ✔ The engine cranks but refuses to start.
  • ✔ Rough idling, stalling, or hesitation during acceleration.
  • ✔ A noticeable drop in fuel economy.
  • ✔ Harsh or incorrect transmission shifting.
  • ✔ Failure to pass an emissions inspection.

Case Study: A Tricky Diagnosis

I remember a 2003 Savana 2500 that came into my shop with an intermittent no-start condition. The owner had already replaced the battery, alternator, and starter to no avail. The van would run fine for days, then suddenly refuse to start. No codes were stored initially. After extensive testing, we found that the 5-volt reference signal from the PCM was dropping out randomly when the module got warm. It was an internal failure that only a deep dive into the electronics could find. Swapping in a pre-programmed PCM like this one solved the issue instantly, saving the customer from further guesswork and unnecessary parts expenses.

A Straightforward Guide to Installation

Installing your new 2003 Astro Powertrain Module is a manageable job for a confident DIYer. The key is to be patient and methodical.

  1. Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes to allow all system capacitors to discharge.
  2. Locate the Module: On the Astro/Safari, the PCM is located on the driver’s side of the engine bay, near the battery. On Express/Savana vans, it’s typically in the LH rear of the engine compartment. Consult a service manual for your specific model if unsure.
  3. Disconnect Connectors: Carefully unclip the wiring harness connectors from the old module. These connectors have locking tabs; do not force them. Inspect the pins for any corrosion or damage.
  4. Remove the Old PCM: Unbolt the old module from its mounting bracket. Keep the hardware as you will reuse it.
  5. Install the New PCM: Mount your new, pre-programmed module in place and secure it with the original hardware.
  6. Reconnect and Secure: Firmly plug the wiring harnesses into the new module until they click into place. Reconnect your vehicle’s battery.
  7. Final Steps: In some cases, a security relearn procedure may be required. This can typically be done by turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine.

Guaranteed Fitment for Your GM Vehicle

This module, service number 12581565, is a direct replacement for a wide range of GM vehicles. Please verify your model and options below. It is a compatible replacement for service numbers: 12581565, 8125815650, 12570557, 12570558, 12576106, 12576869, 12578127, 8125781270, 88864822, and 89017733.

  • 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/SAVANA VANS 1500/2500/3500 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)
  • SIERRA/SILVERADO 1500 PICKUP 03: Electronic Control Module; (LH front under battery), w/4.3L
  • SIERRA/SILVERADO 2500/3500 PICKUP 03: Powertrain 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

Frequently Asked Questions

Do I need to do anything after installing this PCM?

Because we program it to your VIN, it’s typically a plug-and-play installation. However, some GM vehicles may require a security relearn procedure, which is a simple process you can do yourself without any special tools. Instructions are widely available online or in your service manual.

What is the difference between a PCM, ECM, and ECU?

These terms are often used interchangeably. PCM (Powertrain Control Module) is most accurate for this part as it controls both the engine and transmission. ECM (Engine Control Module) and ECU (Engine Control Unit) typically refer to a computer that only manages the engine. For your vehicle, this module serves as the PCM.

What information do you need from me?

After you place your order, we will need your 17-digit Vehicle Identification Number (VIN). This is crucial for us to load the correct GM-certified software for your specific vehicle configuration.

Will this fix my transmission shifting problems?

In many cases, yes. The PCM controls transmission line pressure and shift points based on data from various sensors. If the PCM is faulty, it can cause hard shifts, delayed shifting, or slipping. A correctly programmed module restores these functions to factory specifications.

Is this a guaranteed fix for my check engine light?

This module will correct any issues originating from an internal PCM failure, such as code P0601. However, if your check engine light is on due to a faulty sensor (like an O2 sensor or MAF sensor), you will still need to replace that component. A proper diagnosis is always recommended.

Conditions & Options

Programmed to your VIN GM: 12576106

Year
Genuine OEM

Yes

MPN

12581565

Interchange part number

Condition

Refurbished

Model

astro

Year

2003

Brand

GM

Manufacturer Part Number

, , , , , , , , ,

GTIN

Does not apply

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