AutoCodes – Mercury – P0723 Mercury

P0723 Mercury Code - Output Shaft Speed Sensor Circuit Intermittent Failure

Quick Answer

The Output Shaft Speed (OSS) Sensor provides the Powertrain Control Module (PCM) with information about the rotational speed of an output shaft. Common causes include Faulty Output Speed Sensor (OSS), Output Speed Sensor harness is open or shorted, Output Speed Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0723 Mercury indicates Output Shaft Speed Sensor Circuit Intermittent Failure.
Common causes: Common causes include Faulty Output Speed Sensor (OSS), Output Speed Sensor harness is open or shorted, Output Speed Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 422

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 13, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0723 Mercury Description

The Output Shaft Speed (OSS) Sensor provides the Powertrain Control Module (PCM) with information about the rotational speed of an output shaft. The PCM uses the information to control and diagnose powertrain behavior. In some applications, the sensor is also used as the source of vehicle speed. The sensor may be physically located in different places on the vehicle, depending upon the specific application. The design of each speed sensor is unique and depends on which powertrain control feature uses the information that is generated. The Diagnostic Trouble Code (DTC) will set if the PCM detects an intermittent signal from the OSS sensor.

OBDII Code P0723 Mercury - Output Shaft Speed Sensor Circuit Intermittent Failure - AutoCodes.com — P0723 Mercury Code - Output Shaft Speed Sensor Circuit Intermittent Failure

What does this mean?

What are the Possible Causes of the DTC P0723 Mercury?

Faulty Output Speed Sensor (OSS)
Output Speed Sensor harness is open or shorted
Output Speed Sensor circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P0723 Mercury?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0723 Mercury code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0723 Mercury Code

1. What does the OBDII code P0723 mean on a Mercury vehicle?

P0723 indicates an intermittent failure in the Output Shaft Speed Sensor (OSS) circuit, which monitors the rotational speed of the transmission's output shaft.

2. What are the common symptoms of code P0723 in a Mercury vehicle?

Symptoms may include erratic shifting, the transmission stuck in one gear, reduced fuel efficiency, and the Check Engine Light or transmission warning light illuminating.

3. What causes the P0723 code to appear in a Mercury vehicle?

Common causes include a faulty output shaft speed sensor, damaged or corroded wiring/connectors, a failing transmission control module (TCM), or internal transmission issues.

4. Can I drive my Mercury with the P0723 code?

Driving with this code is not recommended as it can lead to poor transmission performance, potential damage, and unsafe driving conditions.

5. How do I diagnose the P0723 code in my Mercury?

Diagnosis involves scanning for codes, inspecting OSS sensor wiring and connectors for damage, testing the sensor with a multimeter, and checking the TCM for faults.

6. How do I fix the P0723 code on a Mercury vehicle?

Repairs may include replacing the OSS sensor, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the TCM if necessary.

7. How much does it cost to repair the P0723 code?

Repair costs vary but typically range from $100 to $300 for parts and labor, depending on whether the sensor, wiring, or TCM needs replacement.

8. Can a dirty or low transmission fluid level cause the P0723 code?

While uncommon, low or dirty transmission fluid can contribute to transmission performance issues that may trigger related codes. Itâ€™s worth checking and replacing fluid if necessary.

9. How can I prevent the P0723 code from recurring?

Regular maintenance, including checking transmission fluid levels, inspecting wiring for damage, and ensuring proper sensor installation, can help prevent this code.

10. Will clearing the P0723 code with a scanner fix the issue?

Clearing the code removes it temporarily, but if the underlying issue is not resolved, the code will likely return. Proper diagnosis and repair are essential.