Find the OBD-II Diagnostic Port

The Toyota Prius+ (sold as the Prius v in North America, ZVW40 platform, 2012–2021) uses a standard 16-pin OBD-II diagnostic socket, exactly like any other modern Toyota. Even though this is a hybrid with a high-voltage system, the diagnostic connector itself is ordinary and low-voltage, so a normal code reader plugs straight in. On this seven-seat Prius the socket sits low under the driver’s side of the dash and is reachable without removing any trim, which makes it easy to check a warning lamp or read the hybrid system’s stored codes.

OBD-II Port Location

On the Prius+ the diagnostic socket is under the dash on the driver’s side, close to and slightly toward the centre from the steering column. On a left-hand-drive car it is to the left of the steering column, low down near the knee bolster; on a right-hand-drive car it is in the corresponding position on the right. The connector is a pale-coloured 16-pin socket that faces downward under the lower edge of the dash panel. It is not hidden behind a hinged flap on this model — it sits under the trim lip above the driver’s footwell, so you can reach up and plug in directly. If you cannot see it at once, run your fingers along the underside of the dash inboard of the steering column and you will feel the trapezoid-shaped housing.

Before You Plug In

• Park on level ground and apply the parking brake before reaching under the dash.
• Slide the driver’s seat back to give yourself room to lean into the footwell.
• Keep a torch handy; the socket sits in shadow under the dash and is quicker to find with some light.
• Decide first whether you only need stored codes (ignition on) or live hybrid data (system “READY”), so you know how far to switch the car on.

How to Access the Connector

1. Sit in or crouch by the driver’s seat so you can look up under the dash toward the steering column.
2. Follow the underside of the lower dash trim inward from the driver’s door until you are just inboard of the column.
3. Find the pale 16-pin socket by sight or touch; its wider-at-the-top shape means the plug only fits one way.
4. Push your reader’s plug straight in until it clicks and sits flush, without twisting or forcing it.

Tips for Safe Use

• Connect and disconnect the tool with the car switched off to protect the data network.
• For stored codes, switch the ignition on without pressing the brake; press the brake to bring the system to “READY” only when the tool needs the hybrid running.
• The 12 V feed here comes from the small auxiliary battery, not the high-voltage pack, so a plug-in tool draws from the aux battery — unplug dongles when the car is parked for long periods to avoid draining it.
• Keep the reader cable clear of the pedals and steering column while you work.

Frequently Asked Questions

Where is the OBD-II port on a 2012–2021 Toyota Prius+?

It is under the dash on the driver’s side, just inboard of the steering column near the knee bolster. The pale 16-pin socket faces downward under the lower dash lip, so a reader plugs in directly.

Is it safe to use an OBD-II reader on a hybrid Prius+?

Yes. The OBD-II connector is a normal low-voltage data port and is completely separate from the high-voltage hybrid wiring, so a standard reader is safe to use exactly as on a petrol car.

Do I need the car fully powered up to read codes?

For stored trouble codes you only need the ignition on. Bring the car to “READY” by pressing the brake and the power button together when the tool needs live data from the running hybrid system.

My reader shows no power on the Prius+ — what should I check?

That usually points to the +12 V feed on pin 16 or a ground not reaching the socket. Check the auxiliary-battery fuse that supplies the connector and confirm the plug is fully seated before blaming the tool.

Once you have a code from the port, you can find out what it means and how to put it right — look it up on autodtcs.com.