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P1720 Nissan Code - Vehicle Speed Meter Circuit Malfunction

Quick Answer

The P1720 Nissan diagnostic trouble code indicates a malfunction in the vehicle speed meter circuit. Common causes include Faulty vehicle speed sensor, Wiring or electrical connection issues in the speed meter circuit, Defective speedometer gauge cluster. 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
P1720 Nissan indicates Vehicle Speed Meter Circuit Malfunction.
Common causes
Common causes include Faulty vehicle speed sensor, Wiring or electrical connection issues in the speed meter circuit, Defective speedometer gauge cluster.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 19, 2024
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Code P1720 Nissan Description

The P1720 Nissan diagnostic trouble code indicates a malfunction in the vehicle speed meter circuit. This code is typically triggered when the vehicle's onboard computer detects an issue with the speedometer, which is responsible for displaying the vehicle's speed in real-time. The speedometer receives input from various sensors, including the vehicle speed sensor, and processes this data to provide accurate speed readings to the driver. When the vehicle speed meter circuit malfunctions, it can lead to inaccurate speed readings, erratic behavior of the speedometer, or a complete failure of the speedometer display.

OBDII Code P1720 Nissan - Vehicle Speed Meter Circuit Malfunction
P1720 Nissan Code - Vehicle Speed Meter Circuit Malfunction

Common Causes of P1720 Nissan

  1. Faulty vehicle speed sensor
  2. Wiring or electrical connection issues in the speed meter circuit
  3. Defective speedometer gauge cluster
  4. Problems with the transmission control module
  5. ECU (Engine Control Unit) malfunction

Symptoms of P1720 Nissan

  1. Inaccurate speed readings on the speedometer
  2. Speedometer needle jumping or fluctuating
  3. Speedometer not working at all
  4. Check Engine Light illuminated
  5. Transmission shifting issues

How to Fix P1720 Nissan

  1. Diagnose the specific cause of the issue by using a scan tool to read the trouble codes and perform a thorough inspection of the vehicle speed sensor, wiring, and speedometer circuit.
  2. Replace the faulty vehicle speed sensor if it is determined to be the root cause of the problem.
  3. Check and repair any damaged wiring or electrical connections in the speed meter circuit.
  4. Replace the speedometer gauge cluster if it is found to be defective.
  5. Reset the ECU and perform a test drive to ensure the issue has been resolved.

Cost to Fix P1720 Nissan

The repair costs for addressing a P1720 Nissan code can vary depending on the specific cause of the issue and the extent of repairs needed. On average, the cost of replacing a faulty vehicle speed sensor can range from $100 to $200, while replacing a speedometer gauge cluster may cost between $200 and $500. Additional costs for diagnostic time and labor rates at auto repair shops should also be factored in. It's recommended to consult with a qualified mechanic or technician to obtain an accurate cost estimate based on the individual circumstances of the vehicle.

When is the Code Detected?

Malfunction is detected when ECM detects a difference between two vehicle speed sensor signals is out of the specified range.

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Information for Specific Nissan Models

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 P1720 Nissan Code

1. What are the common symptoms of OBDII code P1720 in a Nissan?

- Common symptoms include erratic speedometer readings, inoperative speedometer, and illuminated warning lights on the dashboard.

2. What can cause the OBDII code P1720 in a Nissan?

- The code P1720 is typically triggered by issues such as damaged wiring or connectors in the vehicle speed sensor circuit, a faulty vehicle speed sensor, or a malfunctioning instrument cluster.

3. How can I diagnose the OBDII code P1720 in my Nissan?

- Diagnosis involves checking the wiring and connectors in the vehicle speed sensor circuit for any damage, testing the vehicle speed sensor for proper operation, and verifying the signals sent to the engine control module.

4. Can a faulty instrument cluster cause the OBDII code P1720 in a Nissan?

- Yes, a malfunctioning instrument cluster can potentially cause the code P1720 by disrupting the communication between the vehicle speed sensor and the engine control module.

5. What are some common repair tips for addressing the OBDII code P1720 in a Nissan?

- Repair tips may include repairing or replacing damaged wiring and connectors, replacing the vehicle speed sensor if faulty, and recalibrating or replacing the instrument cluster if needed.

6. Is it safe to continue driving with the OBDII code P1720 illuminated in my Nissan?

- It is generally not recommended to continue driving with the code P1720 present, as it can affect the accuracy of the speedometer readings and potentially lead to other issues with the vehicle's performance.

7. Can a DIY enthusiast fix the OBDII code P1720 in a Nissan?

- Depending on the root cause of the code, some DIY enthusiasts with automotive repair experience may be able to address the issue by following diagnostic procedures and making necessary repairs or replacements.

8. How important is it to address the OBDII code P1720 promptly in a Nissan?

- It is important to address the code promptly to ensure accurate speedometer readings and proper operation of the vehicle's systems that rely on speed sensor data.

9. Will resetting the OBDII code P1720 in a Nissan make it go away permanently?

- Simply resetting the code may temporarily clear the warning light, but the underlying issue causing the code will need to be diagnosed and repaired to prevent the code from reappearing.

10. Can extreme weather conditions affect the occurrence of OBDII code P1720 in a Nissan?

- Yes, extreme weather conditions can potentially impact the vehicle speed sensor and its circuit, leading to issues that trigger the code P1720 in a Nissan.

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