AutoCodes – Mercedes-Benz – P0722 Mercedes-Benz

P0722 Mercedes-Benz Code - Output Speed Sensor No Signal

Quick Answer

The speed sensor detects the revolution of the idler gear parking pawl lock gear and emits a pulse signal. Common causes include Faulty Speed Sensor, Speed Sensor harness is open or shorted, 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: P0722 Mercedes-Benz indicates Output Speed Sensor No Signal.
Common causes: Common causes include Faulty Speed Sensor, Speed Sensor harness is open or shorted, 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 23,662

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 Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0722 Mercedes-Benz Description

The speed sensor detects the revolution of the idler gear parking pawl lock gear and emits a pulse signal. The pulse signal is sent to the Transmission Control Module (TCM) which converts it into vehicle speed.

OBDII Code P0722 Mercedes-Benz - Output Speed Sensor No Signal - AutoCodes.com — P0722 Mercedes-Benz Code - Output Speed Sensor No Signal

What does this mean?

What are the Possible Causes of the DTC P0722 Mercedes-Benz?

Faulty Speed Sensor
Speed Sensor harness is open or shorted
Speed Sensor circuit poor electrical connection

How to Fix the DTC P0722 Mercedes-Benz?

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 P0722 Mercedes-Benz 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.

Need more information about the P0722 Mercedes-Benz code?

Need more information on how to fix the P0722 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0722 Mercedes-Benz code diagnosed by a professional: Find a repair shop in your area

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 P0722 Mercedes-Benz Code

What does the OBDII code P0722 mean on a Mercedes-Benz?

P0722 on a Mercedes-Benz indicates that the transmission control module (TCM) is not receiving a signal from the output speed sensor, which monitors the rotational speed of the transmission's output shaft.

What are the symptoms of a P0722 code in a Mercedes-Benz?

Common symptoms include erratic shifting, transmission stuck in limp mode, inaccurate speedometer readings, poor fuel economy, and possible illumination of the check engine light.

What causes the P0722 code to appear in a Mercedes-Benz?

The code is typically triggered by a faulty output speed sensor, damaged wiring or connectors, issues with the transmission control module, or internal transmission problems.

Can I drive my Mercedes-Benz with a P0722 code?

Driving with a P0722 code is not recommended, as it can lead to further transmission damage, poor performance, and safety risks due to erratic shifting.

How do I diagnose the P0722 code on my Mercedes-Benz?

Start by scanning the vehicle with an OBDII scanner, inspecting the output speed sensor and its wiring for damage, testing the sensor's resistance, and checking the transmission control module for faults.

How do I fix the P0722 code on a Mercedes-Benz?

Possible fixes include replacing the output speed sensor, repairing damaged wiring or connectors, updating or reprogramming the transmission control module, or addressing internal transmission issues.

How much does it cost to fix a P0722 code on a Mercedes-Benz?

Repair costs vary but typically range from $150 to $400 for sensor replacement. More extensive issues, like TCM or transmission repairs, can cost significantly more.

Can a dirty transmission fluid cause the P0722 code?

While dirty or low transmission fluid is not a direct cause of P0722, it can contribute to transmission issues that may trigger related codes or symptoms.

Will clearing the P0722 code make it go away permanently?

Clearing the code with a scanner will reset it temporarily, but if the underlying issue is not fixed, the code will return.

Is the P0722 code specific to Mercedes-Benz?

No, the P0722 code is a generic OBDII code, but the specific symptoms, causes, and repair steps may vary between vehicle manufacturers, including Mercedes-Benz.