P0720 Mercedes-Benz Code - Output Speed Sensor Error
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
- P0720 Mercedes-Benz indicates Output Speed Sensor Error.
- 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.
Code P0720 Mercedes-Benz Description
What are the Possible Causes of the DTC P0720 Mercedes-Benz?
- Faulty Speed Sensor
- Speed Sensor harness is open or shorted
- Speed Sensor circuit poor electrical connection
How to Fix the DTC P0720 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 P0720 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.
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Frequently Asked Questions about P0720 Mercedes-Benz Code
1. What are the common symptoms of an Output Speed Sensor Error (P0720) in a Mercedes-Benz?
- Common symptoms include erratic or harsh shifting, delayed or no shifting, the transmission going into limp mode, and the Check Engine light illuminating.
2. What are the possible causes of the P0720 code in a Mercedes-Benz?
- The P0720 code is typically triggered by a faulty output speed sensor, damaged wiring or connectors, low transmission fluid level, or internal transmission issues.
3. How can I diagnose the P0720 code in my Mercedes-Benz?
- Diagnosis involves using a scan tool to read the code, checking the output speed sensor for proper operation, inspecting wiring and connectors for damage, and ensuring the transmission fluid level is correct.
4. Can I still drive my Mercedes-Benz with the P0720 code present?
- It is not recommended to drive the vehicle with the P0720 code, as it can lead to further transmission damage and safety hazards. It is best to address the issue promptly.
5. How do I repair the Output Speed Sensor Error in my Mercedes-Benz?
- Repairing the P0720 code involves replacing the faulty output speed sensor, repairing or replacing damaged wiring or connectors, topping up transmission fluid, and clearing the trouble codes.
6. Is it possible to prevent the P0720 code from appearing again in my Mercedes-Benz?
- Regular transmission maintenance, such as fluid changes at recommended intervals, can help prevent the recurrence of the P0720 code. Additionally, addressing any underlying issues promptly can help prevent future problems.
7. Are there any DIY tips for fixing the Output Speed Sensor Error in a Mercedes-Benz?
- While some may attempt to replace the output speed sensor themselves, it is recommended to consult with a professional mechanic or technician due to the complexity of the transmission system.
8. How long does it typically take to repair the P0720 code in a Mercedes-Benz?
- The repair time can vary depending on the extent of the issue and the availability of parts. In general, it may take a few hours to a full day to diagnose and fix the P0720 code.
9. Will resetting the Check Engine light make the P0720 code disappear in a Mercedes-Benz?
- Resetting the Check Engine light will clear the code temporarily, but if the underlying issue causing the P0720 code is not addressed, the code is likely to reappear.
10. Can a Mercedes-Benz dealership help with diagnosing and repairing the P0720 code?
- Yes, Mercedes-Benz dealerships have trained technicians and specialized equipment to diagnose and repair issues like the P0720 code effectively.
Discuss the causes and fixes for P0720 Mercedes-Benz OBDII Code
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Start by checking the battery voltage. If the battery voltage is OK, then you need to check the wire connector to the transmission. Also check the fluid level and condition.
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My brother borrowed my car and left sliding roof open during huge rainstorm, started then stalled had to replace one of the large fuses in passenger footwell, then would not go into gear, had to use a pencil to unlock gearshift but is now stuck in limp mode, po 161 po 173 po442 po 455 po500 po700 po720, thought when it dried out it would work again but still stuck in limp mode...any way to reset the problem codes without hacking off a limb to pay for taking it into a mb dealership?? Thank you -
You could try disconnecting the car battery for about 30 min. to reset the code.
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The code won't tell you exactly what part to buy or replace, it gives you an idea in which area the problem is, so you can check the component or wires to the component.
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You have a problem with the transmission output speed sensor, and you must replace the sensor to fix the problem. Let me check if there is something else that may cause the problem. What model and year is your vehicle?
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