2003-2004 Cadillac CTS ECM Engine Control Module | Pre-Programmed to Your VIN

### 2003-2004 Cadillac CTS ECM Engine Control Module \| Pre-Programmed to Your VIN   ## Restore the Heart of Your Cadillac Is your 2003-2004 Cadillac CTS suffering from frustrating and unpredictable engine issues? A faulty Engine Control Module (ECM) can cause everything from a persistent check engine light and rough idling to stalling and a complete no-start condition. It’s time to stop guessing and restore the smooth, responsive performance your luxury sedan was built for. This genuine OEM Engine Control Module is the definitive solution, arriving at your door pre-programmed to your vehicle’s specific VIN for a straightforward installation. ### Common Symptoms & Your Solution If you’re experiencing any of the following, a failing engine computer is the likely culprit: - Unexplained Check Engine Light (CEL) with various codes - Poor acceleration or hesitation - Rough or erratic idling - Reduced fuel economy - Intermittent stalling or difficulty starting - Automatic transmission shifting problems - Communication errors with diagnostic scan tools This replacement **2003-2004 Cadillac CTS ECM** is your direct path to resolving these issues. By replacing the faulty brain of your engine, you restore critical calculations for fuel mixture, ignition timing, and emissions, bringing your vehicle’s performance and reliability back to factory standards. ### Features & Benefits - ✔ **Plug & Play Installation:** We flash this module with the latest GM software using your vehicle’s VIN. This critical step ensures full compatibility and eliminates the need for expensive dealership programming. - ✔ **OEM Reliability, Great Value:** This is a genuine OEM part sourced from a salvaged vehicle, offering the original factory fit and function at a fraction of the cost of a new unit. - ✔ **Guaranteed Compatibility:** A direct replacement for part numbers **12581155, 0261207310, 12992506, 24444020**, and many more. Please verify your part number against the provided list. - ✔ **Restores Peak Performance:** Corrects common issues like rough idling, poor acceleration, and false sensor codes, bringing back the smooth, responsive drive you expect from your Cadillac. - ✔ **Peace of Mind Included:** This unit is backed by our one-year replacement warranty. #### Expert Insight: Why VIN Programming is Non-Negotiable Many people assume you can just swap an ECM from another Cadillac CTS. However, modern vehicles like yours have sophisticated anti-theft systems (GM’s VATS or Passlock) that are tied directly to the ECM and the vehicle’s unique VIN. Installing a non-programmed module will result in a no-start condition, leaving you stranded. Our professional VIN-flashing service pre-configures the unit to communicate perfectly with your car’s existing components, making the installation process as simple as possible and ensuring it starts and runs correctly right away. #### Frequently Asked Questions **Do I need to do any extra programming?** No. We program the unit to your vehicle’s VIN before shipping. In some cases, a simple “security relearn” or “crankshaft position relearn” procedure may be required after installation, which can often be done without special tools. We can provide instructions for these common procedures. **Where do I provide my VIN?** After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We will reach out with instructions, or you can add it as a note during checkout. We cannot ship your part until we have programmed it. **Is this a new part?** No, this is a high-quality, tested, and fully functional used OEM part that was carefully recovered from a salvaged vehicle. This allows us to provide a reliable, factory-spec part at an excellent value. **How can I be sure my ECM is the problem?** While this part fixes the common symptoms listed, we always recommend a thorough diagnosis by a qualified mechanic. Ensure that other potential causes, such as faulty sensors, wiring, or fuel system components, have been ruled out before replacing the **2003-2004 Cadillac CTS ECM**. **What if my part number isn’t on the list?** The list provided covers the most common compatible part numbers. If you do not see your specific part number, please contact us with your vehicle’s VIN and the number from your original ECM. We can verify compatibility for you. Please enter it in the payment notes and save to ensure we receive it. Orders without a VIN within our 2-business-day handling period may be canceled, as programming cannot proceed without it. ### Shipping - **Processing Time:** Reliably shipped within 2-3 business days. ### Warranty Enjoy peace of mind with a **one-year replacement warranty** on this part, effective from the date you receive it. Labor costs are not covered. If the part fails within the warranty period, we’ll replace it with a comparable unit or refund your purchase price, ensuring a hassle-free experience. **Return Address:** **Highway71autoparts** **9131 Highway 71 NE** **Spicer, MN, 56288**

• Country of Origin: United States
• Manufacturer Part Number: 12581155
• Manufacturer Warranty: 1 Year
• Superseded Part Number: 0261206487, 0261207310, 0261207711, 12581155, 12992506, 12992731, 12992732, 12992733, 12992734, 12992735, 12992736, 12992737, 12992738, 24402853, 24402854, 24402855, 24402857, 24402858, 24444019, 24444020, 24444022
• Brand: CADILLAC
• Interchange Part Number: 590-06337
• Fitment Type: Direct Replacement
• Genuine OEM: Yes
• PartNumber: 590
• Model: CTS
• Make: Cadillac
• Year: 2003