Automatic gearbox

P0720 Gearbox output shaft speed sensor not working

By: Diagno editorial team · Updated: 2026-10-15

P0720 means: Gearbox output shaft speed sensor not working. The automatic gearbox control unit found a fault. Drive gently and have the car checked soon. The repair usually costs about €100–2500 in Estonia. The most common cause: gearbox oil is low or old. Other possible causes: sensor or solenoid has failed, wire or connector.

Is it safe to drive?Get it checked soonDrive gently and have the car checked soon.

Typical repair cost€100–2500parts and labour in Estonia

What it means

The automatic gearbox control unit found a fault. The gearbox may go into limp mode: it stays in one gear and shifts harshly or not at all. Often the speedometer stops working too.

What could be wrong

1Gearbox oil is low or old
2Sensor or solenoid has failed
3Wire or connector
4Internal gearbox wear

What you can check yourself

Check for oil spots under the car. Avoid hard acceleration and don't drive far in limp mode. Best left to a workshop. It needs a diagnostic tool and experience.

How we fix it

We read all the gearbox fault codes
We check the gearbox oil
We replace the sensor, solenoid or oil, and repair the gearbox if needed

Standard SAE description: Output Speed Sensor Circuit

This code usually comes with: Check engine lightSee what the light means →

Want a definite answer?

Bring the car to our workshop in Estonia for diagnostics. We read the fault codes, test the sensors and tell you what is wrong. Repair price depends on the work involved, generally €45 per hour.

Book a diagnostic check

Questions

What does fault code P0720 mean?

Gearbox output shaft speed sensor not working. The automatic gearbox control unit found a fault. The gearbox may go into limp mode: it stays in one gear and shifts harshly or not at all. Often the speedometer stops working too.

Can I drive with code P0720?

Drive gently and have the car checked soon.

How much does it cost to fix P0720?

Roughly €100–2500 in Estonia. The price depends on exactly what has failed and on the car.

How is P0720 fixed?

We read all the gearbox fault codes. We check the gearbox oil. We replace the sensor, solenoid or oil, and repair the gearbox if needed.

Based on AI combined with our hands-on workshop experience and knowledge. This information is general and prices are approximate (Estonian workshop rates). The same code can mean different things on different cars. Only an inspection of the car gives a definite answer.