P0654 code — how to fix error fast

Electronics are everything in modern cars whether we like to admit it or not, and if you face the code P0654, it could indicate that something is off with the readings in your vehicle. To cope with this issue, you’ll need to properly diagnose the code and fix the underlying issue that’s causing it.

Luckily, our team is there to help you with that as we take a deep dive into the P0654 code meaning and implications of this bothersome feat. We’ll help you remove the code promptly and take some preventive measures to ensure your vehicle never faces these issues again.

Why you can trust REREV’s OBD2 code advice: Our automotive expert researchers with experienced mechanics undertakes a thorough research methodology to deliver precise insights on OBD codes. Find out more about OBD2 codes research process..

What does the P0654 code mean?

The P0654 code stands for “Engine Control Module Power Relay Control Circuit Open.” This code indicates that there is an issue with the power relay control circuit that controls the ECM. When this circuit is open, it means that the ECM is not receiving power, which can cause various issues with your vehicle.

Some consequences of the code can include decreased fuel efficiency, reduced engine power, and even engine stalling. Symptoms of the code can include a check engine light on the dashboard, difficulty starting the engine, and poor engine performance.

What causes the P0654 code?

To understand why the code appeared in your car, it’s essential to take a look at some of the most common reasons behind it. We’ll discuss each one to make sure you understand how it could have affected the code’s appearance in your car:

Faulty ECM power relay

The ECM power relay controls the power supply to the engine control module. If this relay fails, the ECM will not receive power, which can cause the P0654 code to appear and your ECM’s readings could go bad.

Blown fuses

If the ECM fuse blows, the ECM will not receive power, which can cause the P0654 code to appear. This is a harmless issue if you notice it on time and replace the fuse to get the ECM working again.

Loose or damaged wiring

Loose or damaged wiring can cause an interruption in the power supply to the ECM, which can trigger this code.

Faulty ECM

In rare cases, a failed ECM can cause the code to appear. This issue is more common in older vehicles or those with high mileage.

Which car models does the P0654 code affect the most?

The P0654 code is more common in certain car models than others. Some of the car models that are most likely to experience this issue include:

• Toyota Camry: Some models of the Camry have been known to experience issues with the ECM power relay control circuit, which can trigger the P0654 code.
• Honda Civic: Some versions of the Civic have been known to experience issues with the ECM power relay control circuit.
• Nissan Altima: The Altima is a midsize car that has been produced since the early 1990s. Some models of the Altima have been known to have problems with the ECM power relay control circuit, which can cause the code to appear.

How to diagnose the P0654 code

Diagnosing the P0654 code requires a few steps. Here are some of the diagnostic methods that you may need to use:

Visual inspection

A visual inspection of the wiring and connectors can help identify any loose or damaged connections that may be causing the issue.

Checking the power relay

Using a multimeter, you can check the ECM power relay to see if it is functioning correctly. If it’s not, the relay will have to be replaced so your ECM gets the charge it needs to operate with sensitive vehicle metrics.

Checking the fuse box

It’s always a good method to check the fuse box in your car and look for any blown fuses that may be related to the ECM as this can be a fast and easy fix.

Checking the ECM

In rare cases, a failed ECM may be causing the issue. In this case, a professional diagnostic tool may be required to diagnose the problem accurately.

How to fix the P0654 code

Depending on what you’ve found out during a diagnostic phase, you’ll have to apply one of the following solutions to clear the code and fix the issue behind it:

Replace the ECM’s relay

The most common cause of the P0654 code is a failed ECM power relay. If this is the case, replacing the relay should resolve the issue. Your mechanic or dealership can diagnose and replace the faulty relay.

Repair the wiring

Sometimes, the problem may be with the wiring or connections in the ECM power relay circuit. A damaged or loose wire can cause the P0654 code to appear. Checking and repairing the wiring can help resolve the issue.

Repair or replace the ECM

In rare cases, the issue may be with the ECM itself. If this is the case, repairing or replacing the ECM may be necessary to fix the problem.

How to prevent the P0654 code

Ultimately, there could be a few things you can do to prevent the code from appearing again in your car after fixing it, so here’s what you can do:

• Perform routine maintenance of your vehicle
• Check the wiring and connections
• Check the ECM readings with a multimeter

Additionally, following the manufacturer’s recommended maintenance schedule can help ensure that your vehicle’s systems are in good working order.

Our take

Overall, the P0654 code is a common issue that can cause various problems with your vehicle. Understanding the code, its causes, and how to diagnose and fix it can help you avoid more significant issues down the line.

By following the preventative measures discussed in this article, you can help ensure that your vehicle operates smoothly and efficiently.