How to Reset Prius MPG Computer: The Complete Guide

The Toyota Prius is renowned for it’s impressive fuel efficiency, and monitoring the miles per gallon (mpg) is a helpful tool to assess it’s performance. If you find yourself wanting to reset the mpg display on your Prius's computer, it can easily be done by accessing the ODO on the total miles setting and long-pressing the Trip button on the steering wheel. By following these simple steps, you can reset the mpg computer on your Prius and start afresh with tracking your fuel efficiency.

How Do I Reset My Toyota Prius Computer?

In such a case, you can perform a manual reset on the Toyota Prius computer. To do this, locate the fuse box in the engine compartment. Open the fuse box cover and locate the fuse labeled “ECU-B” or “ECM-B”. Use the fuse puller provided in the fuse box to remove the fuse. Leave the fuse out for approximately 30 seconds to ensure a complete reset of the computer system.

After the 30 seconds have passed, reinsert the fuse into the fuse box and close the cover. Monitor the warning lights on your dashboard to see if the reset cleared the issue. If the warning light remains on, it may be necessary to bring your Prius to a qualified technician for further diagnosis and possible repairs.

Start by locating the battery, usually located in the trunk area of the vehicle or under the rear seat. Use a wrench or pliers to loosen and remove the negative terminal cable from the battery. Leave the cable disconnected for at least 15 minutes to ensure a complete reset. After the specified time has passed, reconnect the negative terminal cable to the battery and tighten it securely.

Once again, start your Toyota Prius and observe if the warning lights have been cleared. If they remain on, it’s recommended to seek professional assistance to diagnose and resolve the issue.

However, it’s also crucial to understand that resetting the computer won’t fix any underlying mechanical or electrical issues with the vehicle. If you continue to experience problems or suspect a more significant problem, it’s best to consult a professional mechanic or visit your local Toyota dealership for assistance.

Resetting the Electronic Control Unit (ECU) in a Toyota vehicle can be done by following a simple procedure. This involves using a paper clip to connect specific terminals for a minimum of 30 minutes, subsequently removing the clip to initiate the reset. Upon resetting, various cluster lights, such as P/S, airbag, and ABS, may briefly illuminate before returning to their normal state.

How Do You Reset a Toyota ECU?

When it comes to resetting the Electronic Control Unit (ECU) in a Toyota vehicle, there are a few steps you can follow. To initiate the ECU reset process, you’ll need a simple tool like a paper clip. Start by locating the OBD-II diagnostic port, usually located under the dashboard on the drivers side. Once you’ve located the port, carefully insert the paper clip into pins 4 and 13 of the connector.

Once the paper clip is securely connected to pins 4 and 13, it’s important to keep it connected for at least 30 minutes. During this time, you may want to take precautionary measures like disconnecting the negative terminal of the cars battery to ensure no power is supplied to the ECU.

After the 30-minute waiting period, you can proceed with the next step. Insert the key into the ignition and turn it to the “On” position without starting the engine. If the ECU reset process is successful, you’ll notice multiple cluster lights such as P/S, airbag, ABS, and others illuminating temporarily.

At this point, you’ve completed the required waiting time, and it’s safe to remove the paper clip from pins 4 and 13 of the OBD-II connector. Be cautious when removing the paper clip to avoid damaging the connector or any surrounding components.

It’s recommended to start the cars engine and let it idle for a few minutes to allow the ECU to relearn various parameters and calibrate itself with the vehicles systems.

Resetting the ECU can be useful in a variety of situations, such as resolving certain error codes or improving overall engine performance. However, it’s important to note that resetting the ECU will also restore the factory default settings, potentially erasing any customizations or modifications previously made.

Remember, if you’re unsure about performing an ECU reset or encounter any difficulties, it’s always advisable to consult a professional technician or refer to the vehicles owner manual for guidance.


By ensuring that the ODO is set to total miles, you can easily reset the display by pressing and holding the Trip button on the steering wheel. This straightforward method allows for convenient resetting of the mpg computer, ensuring accurate tracking and monitoring of your vehicle's fuel efficiency.

Scroll to Top