Restore Peak Performance to Your Cadillac CTS
Is your 2003-2004 Cadillac CTS running rough, showing a persistent check engine light, or refusing to start? A failing Engine Control Module (ECM) is often the culprit, disrupting everything from fuel delivery to transmission shifting. Don’t let a faulty computer keep you off the road. This genuine GM ECM is your direct, reliable solution, professionally programmed to your vehicle’s specific VIN for a hassle-free installation.
Common Symptoms & Your Solution
A failing ECM can cause a cascade of frustrating issues. If you’re experiencing any of the following, this part is the definitive fix:
- Persistent Check Engine Light (CEL)
- Diagnostic Trouble Codes (DTCs) like P0601, P0603, P0606
- Engine stalling, misfiring, or poor acceleration
- Reduced fuel economy
- Harsh or erratic automatic transmission shifting
- Complete no-start condition
Instead of paying for expensive diagnostics and dealership programming, our pre-programmed 2003-2004 Cadillac CTS ECM arrives ready to install, getting you back on the road quickly and affordably.
Features & Tangible Benefits
- ✔ Programmed to Your VIN: This module is flashed with the latest GM software matched directly to your car. This eliminates the need for a trip to the dealer, saving you hundreds in programming fees.
- ✔ Plug-and-Play Installation: Once you receive the unit, the installation is straightforward. In many cases, no complex relearn procedures are required, making it a viable job for a confident DIYer or any professional mechanic.
- ✔ Genuine OEM Part: Sourced from a salvaged vehicle, this is an original equipment part, ensuring perfect fitment and communication with your Cadillac’s other electronic systems.
- ✔ Comprehensive Compatibility: This unit is a direct replacement for a wide range of part numbers, including 12992731, 0261207310, 12581155, 24402853, and many more.
- ✔ One-Year Warranty: This unit is backed by our one-year replacement warranty. Drive with confidence knowing your purchase is protected.
Expert Insight: The Critical Role of VIN-Specific Programming
Many sellers offer generic or ‘unlocked’ modules, but for a sophisticated vehicle like the Cadillac CTS, that’s a recipe for disaster. Your car’s VIN is linked to specific options, security protocols (like the anti-theft system), and transmission settings. Our process ensures the 2003-2004 Cadillac CTS ECM we send you is an exact digital clone of your original, preventing compatibility conflicts, immobilizer lockouts, and performance issues that plague improperly programmed units. We take the guesswork out of the repair so you can focus on the results: a smooth, reliable ride.
Frequently Asked Questions
Do I need to do any programming after I receive it?
No. We program the ECM to the VIN you provide before shipping. It will arrive ready for installation. In some rare cases, a security or crankshaft position sensor relearn may be necessary, which can be performed with a capable scan tool.
How do I provide my Vehicle Identification Number (VIN)?
After you complete your purchase, simply send us a message with your 17-digit VIN. We cannot ship your part until we receive this information, as the programming is a critical part of the order.
Is this a brand-new part?
No, this is a high-quality, tested used part that was sourced from a salvaged vehicle. This allows us to offer a genuine GM component at a significant savings over a new dealership part.
Where is the ECM located on my 2003-2004 CTS?
The Engine Control Module is typically located in the engine compartment on the right-hand (passenger) side. Always disconnect the battery before attempting to remove or install any electronic components.
What if my original part number isn’t on your list?
Our list is comprehensive, but if you don’t see your exact number, please contact us with your part number and VIN. We can verify compatibility to ensure you receive the correct 2003-2004 Cadillac CTS ECM for your vehicle.