2008-2009 Cadillac STS ECM Engine Control Module 12630594

Restore Your Engine’s Brainpower

Get your vehicle running smoothly again with this pre-programmed Engine Control Module for 2008-2009 Cadillac STS, CTS, and other GM models. Flashed to your VIN with the latest GM software, it’s the direct-fit solution for stalling, check engine lights, and poor performance. Order today for a hassle-free installation!

$249.00

+11.99 USPS Priority Shipping

Availability: In stock



SKU: 590-01037-29 Categories: ,
Guaranteed Safe Checkout

Restore Peak Performance to Your GM Vehicle

Is your 2008-2009 Cadillac STS, CTS, or another compatible GM vehicle suffering from perplexing issues like a persistent check engine light, rough idling, stalling, or poor fuel economy? These are classic signs of a failing Engine Control Module (ECM), the electronic brain of your vehicle’s powertrain. A faulty ECM can disrupt everything from fuel injection timing to transmission shifting, leading to a frustrating and unreliable driving experience. This direct-fit Engine Control Module, part number 12630594, is the definitive solution to restore your engine’s health and your peace of mind.

From the Diagnostic Bay

We once had a 2009 Cadillac CTS come into the shop with a list of complaints: intermittent stalling at red lights, a check engine light with a dozen random codes, and a transmission that shifted harshly. The owner had already replaced the spark plugs, ignition coils, and even a mass airflow sensor with no improvement. After hours of chasing electrical gremlins, we traced the issue back to a failing ECM. The internal processor was failing intermittently, sending corrupt data to other modules. Installing a properly programmed ECM, like this one, not only fixed all the symptoms but also saved the customer from replacing more perfectly good parts. It’s a powerful reminder that the ECM is the foundation of your vehicle’s entire electronic system.

Why Choose Our Pre-Programmed 2008-2009 STS ECM?

The key to a successful ECM replacement is the programming. Modern vehicles have complex security systems and vehicle-specific options that are all managed by the ECM. Simply installing a blank or used module from another vehicle will result in a no-start condition. We eliminate this hassle completely. When you purchase this module, we use the Vehicle Identification Number (VIN) you provide to flash it with the latest, most stable software updates directly from GM. This ensures that the module is a perfect match for your vehicle’s specific configuration, including engine parameters, transmission type, and anti-theft system. It arrives at your door ready for installation, saving you a costly trip to the dealership for programming.

Common Symptoms of a Failing ECM

  • ✔ Persistent Check Engine Light (CEL) with various trouble codes.
  • ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
  • ✔ Noticeable decrease in fuel efficiency.
  • ✔ Harsh or erratic automatic transmission shifting.
  • ✔ Difficulty starting the engine or a complete no-start condition.
  • ✔ Communication errors with diagnostic scan tools.
  • ✔ Other warning lights on the dashboard may illuminate.

Guaranteed Fitment and Compatibility

This ECM is a direct replacement for a range of GM vehicles and is compatible with multiple original part numbers. Please verify your vehicle is on the list below. This module is a direct replacement for part numbers: 12623325, 12628387, 12605672, 12630594, and 19300016.

Vehicle Fitment List:

  • Cadillac CTS 2008-2009: Electronic Control Module; (RH front engine compartment), 3.6L, VIN V (8th digit)
  • Cadillac STS 2008-2009: Electronic Control Module; (RH engine), 3.6L
  • GMC Acadia 2009: Electronic Control Module; (behind fan shroud)
  • Buick Enclave 2009: Electronic Control Module; (behind fan shroud)
  • Chevrolet Traverse 2009: Electronic Control Module; (behind fan shroud)
  • Saturn Outlook 2009: Electronic Control Module; (behind fan shroud)

IMPORTANT: After placing your order, you must provide us with your vehicle’s 17-digit VIN to ensure we can program the module correctly before shipment. Failure to provide a VIN will result in a delay or cancellation of your order.

Frequently Asked Questions

Do I need to get this ECM programmed by a dealer?

No. We handle all the programming for you before we ship the part. We use your vehicle’s VIN to load the correct GM factory software, making it ready for installation right out of the box.

Where is the ECM located on my 2008 Cadillac STS?

On the 2008-2009 Cadillac STS with the 3.6L engine, the ECM is typically located in the engine compartment on the right-hand (passenger) side.

What information do you need from me after I order?

We require your vehicle’s 17-digit Vehicle Identification Number (VIN). This is essential for us to program the module to match your car’s exact specifications and features.

Is this part truly plug-and-play?

For most vehicles, yes. After installation, you may need to perform a simple security relearn procedure, which can often be done without special tools and takes about 30 minutes. Instructions are widely available online or in service manuals.

What happens if I forget to send my VIN?

We cannot ship an unprogrammed module. Our team will contact you to request the VIN, but this will delay your order. To ensure the fastest service, please provide your VIN during checkout or immediately after purchasing.

Will this fix my specific check engine light codes?

This module will resolve any diagnostic trouble codes (DTCs) that are directly caused by a failing ECM, such as internal processor faults or driver circuit errors. It will not fix codes related to other faulty sensors or mechanical components on the vehicle.

Genuine OEM

Yes

Year
Condition

Refurbished

MPN

12630594

Brand

GM

Year

2009

Model

STS

Hardware Type

Interchange part number

Manufacturer Part Number

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