P0720 - Vehicle Speed Sensor Circuit Malfunction in Common Models like Ford, Honda, and Toyota

Quick Answer

P0720 means: P0720 indicates a malfunction in the vehicle speed sensor circuit, affecting speed readings and transmission performance.

Fix: Check and replace faulty components Cost: $100 - $300 Time: 90-180 minutes

Can I drive with P0720? Address this issue quickly to prevent further damage to the transmission and ensure safe driving.

Common Questions

What does P0720 mean and how does it affect my car?

The P0720 code signifies a malfunction in the vehicle speed sensor circuit, which plays a critical role in how your car drives. When this code appears, it can lead to inaccurate speedometer readings, erratic shifting in automatic transmissions, and poor fuel economy. Ignoring this problem can result in more severe damage to your vehicle's transmission and engine performance over time.

What are the most common causes of P0720 and how much does it cost to fix?

Common causes of the P0720 code include a faulty vehicle speed sensor, damaged wiring, or issues with the engine control module. Repair costs can range from $100 to $300 for a sensor replacement, while wiring repairs may cost between $50 and $150. It's crucial to diagnose the exact issue to determine the appropriate repair.

Can I drive my car with P0720 or should I stop immediately?

While you may be able to drive your vehicle with a P0720 code, it is not advisable. Continuing to drive may lead to increased wear on your transmission and further issues down the line. It's best to address the code as soon as possible to ensure safe driving and prevent additional damage.

How can I diagnose P0720 myself using GeekOBD APP?

To diagnose the P0720 code using the GeekOBD APP, start by connecting the OBD2 scanner to your vehicle's port. Use the app to read the trouble codes and examine freeze frame data to identify the context of the fault. You can then perform component tests, checking the voltage and resistance of the vehicle speed sensor directly through the app.

What vehicles are most commonly affected by P0720?

The P0720 code is commonly found in models like the 2015-2018 Honda Civic, 2010-2015 Ford Fusion, and 2007-2013 Toyota Camry. If you own any of these vehicles, it's essential to be aware of this code and its potential implications on performance.

How can I prevent P0720 from happening again?

To prevent the P0720 code from occurring again, regularly check and maintain the vehicle speed sensor and its wiring. Ensure that your vehicle undergoes routine inspections and maintenance, especially if you drive in harsh conditions. Keeping connections clean and secure can significantly reduce the chances of future failures.

What is P0720?

The P0720 trouble code indicates a malfunction in the vehicle speed sensor (VSS) circuit. This sensor is crucial for relaying the speed of the vehicle to the engine control module (ECM), which uses this information to adjust engine performance, fuel economy, and transmission shifting. When a P0720 code is triggered, it often means that the signal from the VSS is either absent or out of range as detected by the ECM. Symptoms of this issue may include erratic speedometer readings, harsh shifting in automatic transmissions, or even a complete failure of the speedometer. In the real world, ignoring this code can lead to reduced fuel efficiency, increased wear on transmission components, and a less responsive driving experience. Commonly affected vehicles include models like the 2015-2018 Honda Civic, 2010-2015 Ford Fusion, and 2007-2013 Toyota Camry. It's essential for car owners to address this issue promptly to maintain optimal vehicle performance and safety.

System: P - Powertrain (Engine, Transmission, Emissions)

Symptoms

Common symptoms when P0720 is present:

  • Check engine light stays on constantly, indicating a persistent issue with the vehicle speed sensor.
  • Engine hesitates during acceleration, making it difficult to maintain consistent speed.
  • Fuel economy decreased by 10-15%, as the engine struggles to adjust fuel delivery without accurate speed data.
  • The speedometer may fluctuate erratically, providing inaccurate readings while driving.
  • Harsh or erratic shifting in automatic transmissions, leading to a rough driving experience.

Possible Causes

Most common causes of P0720 (ordered by frequency):

  1. The most common cause is a faulty vehicle speed sensor, occurring in about 60% of cases. This may be due to wear and tear or exposure to harsh elements.
  2. A broken or damaged wiring harness connected to the sensor can cause signal loss, often due to corrosion or physical damage.
  3. Faulty engine control module (ECM) software or incorrect programming can also lead to erroneous readings, though this is less common.
  4. Less common but serious causes include a malfunctioning transmission control module, which may require replacement.
  5. Rarely, issues like a defective transmission or internal mechanical failures can trigger the P0720 code.

P0720 Repair Costs

Cost Breakdown by Repair Type

Vehicle Speed Sensor Replacement

Replacing the faulty vehicle speed sensor is the most direct solution for the P0720 code.

  • Total: $100 - $300
  • Success rate: 90%
Wiring Harness Repair

Repairing or replacing damaged wiring that connects the VSS to the ECM.

  • Total: $50 - $150
  • Success rate: 80%
ECM Reprogramming

In rare cases, reprogramming the ECM may be necessary if it misinterprets signals.

  • Total: $100 - $200
  • Success rate: 70%
Money-Saving Tips for P0720
  • Start with the most common and least expensive repairs first
  • Use GeekOBD APP to confirm diagnosis before replacing expensive parts
  • Consider preventive maintenance to avoid future occurrences
  • Compare prices for OEM vs aftermarket parts based on your needs
  • Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional P0720 Diagnosis Process

Follow these systematic steps to accurately diagnose P0720. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Component testing - Use a multimeter to check the voltage and resistance of the vehicle speed sensor (20-30 minutes)

Step 3: Component testing - Use a multimeter to check the voltage and resistance of the vehicle speed sensor (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and monitor for any return of the P0720 code (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and monitor for any return of the P0720 code (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

Important Notes

  • Always verify the repair with GeekOBD APP after completing diagnostic steps
  • Clear codes and test drive to ensure the problem is resolved
  • Address underlying causes to prevent code recurrence

Real Repair Case Studies

Case Study 1: Vehicle Speed Sensor Replacement on 2015 Honda Civic

Vehicle: 2015 Honda Civic, 75,000 miles

Problem: Customer reported a check engine light and fluctuating speedometer readings.

Diagnosis: Performed an OBD2 scan with GeekOBD APP, confirming the P0720 code. Visual inspection revealed corrosion on the VSS connector.

Solution: Replaced the vehicle speed sensor and repaired the corroded wiring. Cleared the codes and verified operation.

Cost: $250 (sensor: $150, labor: $100)

Result: Customer reported normal speedometer function and no further check engine light activation.

Case Study 2: Wiring Repair on 2010 Ford Fusion

Vehicle: 2010 Ford Fusion, 90,000 miles

Problem: The vehicle experienced erratic shifting and check engine light.

Diagnosis: Scanned for codes using GeekOBD APP, identified P0720. Inspected wiring and found a damaged harness.

Solution: Repaired the wiring and ensured secure connections. Conducted a system function test post-repair.

Cost: $150 (wiring repair: $50, labor: $100)

Result: Shifting improved significantly, and the check engine light did not return after the repair.

Diagnose P0720

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: P0720
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes