OBD-II Generic Error Code P0723: How to Fix It

Medium 1-2 hours Medium Severity Verified June 2026
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Error Code
P0723
Brand
OBD-II Generic
Product Type
automotive
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
1-2 hours
Error code P0723 means your vehicle's powertrain control module (PCM) has detected an intermittent signal from the output speed sensor. This sensor monitors transmission output shaft speed. An intermittent circuit can cause erratic shifting, speedometer issues, or limp mode. This guide helps you diagnose and fix the problem.
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Tools You'll Need

How to Fix Error Code P0723

  1. Safety First and Preparation

    Always disconnect the battery before working on electrical components. Failure to do so may cause injury or damage.

  2. Locate the Output Speed Sensor

  3. Inspect the Sensor and Wiring

    Use care when probing connectors to avoid damaging pins.

  4. Test the Output Speed Sensor Signal

    Ensure the vehicle is securely supported on jack stands if raising it. Never spin wheels with the vehicle on the ground.

  5. Check the Reluctor Ring/Tone Wheel

    Rotate the shaft only when the engine is off and transmission is in neutral.

  6. Replace the Output Speed Sensor if Faulty

    Do not over-tighten the sensor bolt as it can crack the sensor housing.

  7. Clear the Code and Test Drive

    Drive safely and obey traffic laws during the test drive.

Parts You May Need

Output speed sensor
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Electrical connector pigtail
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Output speed sensor
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Electrical connector pigtail
Check Price on Amazon
Output speed sensor
Check Price on Amazon
Electrical connector pigtail
Check Price on Amazon
Output speed sensor
Check Price on Amazon
Electrical connector pigtail
Check Price on Amazon
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When to Call a Professional

If you're uncomfortable working on transmission components, or if after replacing the sensor and checking wiring the code returns, consult a professional mechanic. Internal transmission issues (e.g., worn bushings, damaged tone wheel) may require specialized tools and expertise.

Frequently Asked Questions

Can I drive my car with error code P0723?
It is not recommended. Driving with an intermittent sensor circuit can cause erratic shifting, reduced fuel economy, and potential transmission damage. Have it diagnosed and repaired promptly.
Will P0723 cause my check engine light to flash?
It may or may not. A steady check engine light indicates a stored code; a flashing light signals a severe misfire or catalyst damage risk. P0723 typically illuminates a steady light.
How much does it cost to fix P0723?
If DIY, a new output speed sensor costs $20-$80 plus basic tools. If a mechanic does it, labor adds $100-$200 depending on vehicle and location.
What is the difference between P0722 and P0723?
P0722 indicates 'Output Speed Sensor Circuit No Signal' (no signal detected), while P0723 is 'Intermittent' (signal present but erratic). Both point to sensor or wiring issues.
Can a bad battery cause P0723?
Rarely, a weak battery or poor ground can cause erratic sensor readings. Check battery voltage and connections as part of diagnosis.

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