How long does the engine control module (ECM) last?
Auto repair

How long does the engine control module (ECM) last?

09.11.2022 /

As technology continues to evolve and move forward, so does the way our vehicles work and perform. More and more details seem to rely on computers and sensors than ever before. The ECM Power Relay is a perfect example of these technological advances.

The ECM stands for "engine control module", and as you might suspect, it is responsible for controlling engine functions. It monitors all kinds of information, making necessary adjustments to things like injection systems, fuel delivery, power distribution, exhaust system, engine timing, ignition system, emissions, and more. It's basically observing all kinds of things.

For the ECM to work, it needs power and this is where the ECM power relay comes into play. Every time you turn the key in the ignition, the ECM relay gets energized and turns on the actual ECM. Although the ECM power relay is designed to last the lifetime of your vehicle, it can still fail occasionally. If so, it's usually due to humidity issues or a power distribution issue. You will not be able to leave the part as is, as your vehicle requires an ECM power relay to operate.

Here are some signs that your ECM power relay may be on its last legs and need to be replaced.

  • The Check Engine light may come on because the engine is not working properly.

  • The engine may not start even when the ignition is on. This can happen if the relay is stuck in the open position.

  • Your engine may not start even when you turn the key.

  • If the ECM power relay is stuck in the closed position, then the ECM receives a constant flow of power. This means that your battery will drain fairly quickly, so you will either have a dead or badly weakened battery.

Once the ECM's power relay starts showing signs of a problem, you'll want to check it. If you leave it to full failure, then you will have trouble running your car smoothly, and it may not even start at all. If you experience any of these symptoms and suspect that your ECM power relay needs to be replaced, have a diagnosis or have an ECM power relay replaced by a professional mechanic.

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