Fault code P0723 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P0723 – Output Speed Sensor Intermittent

P0723: Causes, signs and repairs

Error code P0723 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected an error in the output signal of the speed sensor in the transmission. This DTC P0723 indicates a problem with the transmission output speed sensor, which is responsible for correct gearshift control and vehicle speed measurement.

What can cause this error code?

Defective transmission output speed sensor
Damaged wiring to the speed sensor
Corroded or loose plug connections
Defective transmission control unit (TCM)
Mechanical damage to the sensor ring
Dirty or damaged sensor contacts
Interruption in the signal line
Short circuit in the sensor circuit

What symptoms occur in parallel with fault code P0723?

Shifting problems: Irregular or hard gear changes in the automatic transmission
Speedometer failure: Speed display does not work or shows incorrect values
Cruise control malfunction: Cruise control system is not working properly
ABS problems: Anti-lock braking system may be affected
Emergency program: Transmission switches to safety mode
Increased fuel consumption: Due to inefficient transmission control

How to fix the problem of trouble code P0723?

Repairing trouble code P0723 requires a systematic diagnosis of the transmission electronics.
Sensor replacement: Replace the defective transmission output speed sensor completely and replace the seals at the same time
Cable repair: Locate damaged cables to the sensor, repair severed areas or replace the entire cable set
Clean the plug connection: Thoroughly clean corroded contacts on the sensor cable and treat with contact spray
Transmission control unit reset: After the repair, reprogram the TCM and delete all stored error codes
Sensor ring inspection: Repair mechanical damage to the sensor gear wheel or replace the entire component
Complete wiring check: Test all electrical connections between sensor and control unit for continuity and insulation faults

FAQ - Frequently asked questions about DTC P0723

Can I continue driving with error code P0723?

Short distances are possible, but you should have fault code P0723 rectified as soon as possible. The transmission can switch to emergency mode, which leads to increased wear.

How much does it cost to repair fault code P0723?

The repair costs for code P0723 are between 150-600 euros. A new speed sensor costs 80-250 euros, plus 70-350 euros in labor costs depending on accessibility.

How do I recognize a defective transmission output speed sensor with P0723?

Typical signs are jerky gear changes, a faulty speedometer, non-functioning cruise control and the engine indicator light. An OBD diagnosis confirms the EOBD error code P0723.

Can I replace the sensor for P0723 myself?

It is possible to replace the sensor if you are a skilled mechanic, but often requires the vehicle to be lifted. After the replacement, the transmission control unit must learn the new sensor.

Why does error code P0723 occur more frequently in older vehicles?

With increasing age, the sensor contacts and cable insulation wear out. Moisture and dirt can also cause the speed sensor to fail.

What other fault codes occur together with P0723?

The codes P0722 (output signal intermittent) or P0721 (noise level too low) often appear at the same time, as they affect the same sensor.

Vehicles in which fault code P0723 occurs most frequently

Error code P0723 is a transmission-related trouble code and can occur in various automatic transmissions, but is most common in the following vehicles:

Volkswagen: Golf, Passat, Jetta, Touran (2005-2015)
Audi: A3, A4, A6, Q5 (2004-2014)
BMW: 3 Series, 5 Series, X3, X5 (2006-2016)
Mercedes-Benz: C-Class, E-Class, ML-Class (2005-2013)
Ford: Focus, Mondeo, S-Max, Galaxy (2007-2017)
Opel: Astra, Insignia, Zafira (2009-2018)
Peugeot: 308, 508, 3008 (2010-2019)
Renault: Megane, Laguna, Scenic (2008-2016)

If the code P0723 occurs in your vehicle, you should first have an OBD diagnosis carried out to determine the exact cause. As this DTC can impair driving safety, it is advisable to have it repaired promptly at a qualified workshop. Most modern diagnostic devices can reliably read out error code P0723 and assist with troubleshooting.

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