Is Your Cadillac STS Running Rough or Not Starting?
A failing Engine Control Module (ECM), often called the engine computer, is the central command center for your vehicle’s engine. When it begins to fail, it can cause a cascade of confusing and frustrating problems that are often misdiagnosed. If your 2006 Cadillac STS is experiencing issues like stalling, poor fuel economy, a persistent check engine light, or a complete no-start condition, a faulty ECM is a likely culprit. This module is a direct-fit, VIN-programmed replacement that restores your vehicle’s performance and reliability without an expensive trip to the dealership for programming.
From the Diagnostic Bay
We had a 2006 STS come into the shop with an intermittent stalling issue that was driving the owner crazy. He had already replaced the spark plugs, ignition coils, and even the fuel pump based on advice from various forums. The check engine light was on with a handful of communication codes (U-codes) that didn’t point to a single sensor. After checking the main power and ground circuits to the ECM, we determined the module itself was failing internally, especially when it got hot. Instead of a costly new unit from the dealer, we installed one of our pre-programmed modules. The car started right up, the codes cleared, and the stalling issue was completely gone. It saved the customer hundreds of dollars in parts and labor compared to continued guesswork.
Symptoms of a Failing Engine Control Module
- ✔ Check Engine Light is illuminated, often with communication error codes.
- ✔ Engine stalls unexpectedly or struggles to start.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Rough or erratic idling and poor engine performance.
- ✔ Hesitation or stumbling during acceleration.
- ✔ Automatic transmission shifting problems.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
Why Choose Our Pre-Programmed 2006 STS Engine Control Module?
This isn’t just a replacement part; it’s a complete solution. The biggest hurdle when replacing a modern ECM is the need for vehicle-specific programming. Without it, the module won’t communicate with your car’s other systems. We handle this critical step for you. When you place your order, simply provide us with your vehicle’s VIN. Our technicians will then flash the module with the latest, most stable software updates directly from GM. This ensures perfect compatibility and optimal performance right out of the box. This unit is a direct replacement for multiple service numbers, including 12590032, 12602044, 12603530, 12605843, 12607096, 12630457, and 19210737, guaranteeing a perfect fit for a wide range of GM vehicles.
Simple, Straightforward Installation
Our goal is to get you back on the road quickly. The process is simple:
- Order the Module: Complete your purchase through our secure checkout.
- Provide Your VIN: Reply to your order confirmation email with your 17-digit Vehicle Identification Number (VIN).
- We Program & Ship: Our technicians will program the module specifically for your vehicle and ship it out promptly.
- Install the Part: Installation is typically straightforward. Once installed, you may need a certified mechanic to perform a security relearn or Crankshaft Position Sensor (CASE) relearn procedure, which syncs the new computer with your vehicle’s anti-theft and engine systems. This is a standard procedure for this type of repair.
Frequently Asked Questions
Do I need to send my old ECM to you?
No, there is no core charge or need to send your old part back to us. This is a direct replacement part that you purchase outright.
What is a VIN programming service?
VIN programming involves loading your vehicle’s specific software and calibration files onto the ECM. This ensures the computer knows your car’s engine size, transmission type, and other options, allowing it to function correctly. We perform this service before shipping.
Is this a plug-and-play part?
For the most part, yes. We handle the main programming. However, depending on your specific GM vehicle, a final ‘relearn’ procedure (like a CASE or security relearn) may be required after installation. This is a simple task for any professional mechanic with a capable scan tool.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM, then yes, this part will resolve the issue. It’s crucial to ensure the ECM is the true source of the problem. If other components like sensors or wiring are faulty, they will still need to be addressed.
Which vehicles does this ECM fit?
This ECM is compatible with a very wide range of General Motors vehicles from approximately 2005 to 2010, including models from Cadillac, Chevrolet, Buick, GMC, Pontiac, Saturn, and more. Please refer to the detailed fitment list on this page to confirm compatibility with your exact year, make, and model.