P0723

Output Speed Sensor Circuit Intermittent

Car Fault Codes Transmission

Can you still drive? With care, short trips only

Who can fix it? Needs a workshop

Typical repair time 30 minutes – 3 hours

Typical cost SAR 100 to 700

What it means

The computer has seen the output speed sensor signal drop out briefly and then return while driving. This usually points to a poor contact, a partly broken wire or a corroded connector, and it can show up as a sudden speedometer drop or an unexpected shift.

Symptoms4

Check engine light coming on and off.
Brief, sudden speedometer drops on some vehicles.
Occasional unexpected downshifts or harsh shifts.
Cruise control suddenly disengaging.

Possible causes5

Corrosion or poor contact at the sensor connector from water and dirt.
A partly broken wire affected by transmission vibration and engine movement.
A sensor that fails temporarily when hot.
A loose sensor mounting.
A weak ground connection.

How to diagnose5

Record output speed and wheel speed during a road test, and look for sudden drops in output speed alone.
Gently move the connector and wiring while watching the reading.
Inspect the connector for corrosion, water or loose pins.
Confirm the sensor is mounted tightly.
Measure sensor resistance cold and hot and compare with the manufacturer specification.

How to fix5

Clean the connector and tighten the pins, or replace it.
Repair the partly broken wire and secure the harness.
Tighten the sensor mounting.
Replace the sensor if it is proven to fail when hot.
Clear the codes and confirm the reading stays steady on a long drive.

Repair cost

0–500

500–2,000

2,000–5,000

5,000+

In Saudi riyals; the highlighted part is the expected range for this fault.

A connector or wire repair usually solves it at low cost; the cost rises when the sensor is replaced.

Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026

Frequently asked questions

Why does the speedometer drop and come back?

On vehicles that use this sensor, every brief signal dropout shows as a speedometer drop, which is clear evidence of an intermittent electrical fault.

Can washing under the car trigger this code?

It can, because the connector often sits where water reaches it, and water inside causes dropouts until it dries or corrosion sets in.

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This guide is for information only and does not replace an inspection by a qualified technician. If the fault involves brakes, steering, engine temperature, electrics or refrigerant, do not attempt the repair yourself.

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