By Ezra Lane When you encounter the P0720 code on your 2005 Nissan Altima, it points to a problem with the output speed sensor circuit, often due to a faulty sensor, damaged wiring, or poor connections. You might notice erratic speedometer readings or unusual shifting patterns, which can impact driving safety and fuel efficiency. Accurately diagnosing this involves checking the sensor's resistance and voltage against Nissan's specifications using a digital multimeter. Replacing a defective sensor usually resolves the issue, but it's vital to also inspect related wiring and connectors to avoid misdiagnosis. Taking immediate action will help maintain your car's performance, and a deeper exploration can provide further insights into preventive measures.
P0720 Nissan Code Meaning
To address a P0720 code on a Nissan Altima, inspect the output speed sensor, its wiring, and connections for damage.
Test the sensor's resistance and voltage.
Replace or repair as needed to prevent transmission issues and maintain vehicle performance.
Prompt action ensures reliability and avoids further complications.
Error Code P0720 Symptoms
When you encounter a P0720 code in your Nissan Altima, you might notice several signs:
- Speedometer Acting Up: Your speedometer may show sudden jumps or drops. This makes it hard to know how fast you're actually going.
- Transmission Trouble: The car might shift gears roughly or take longer than usual to change gears. This can be uncomfortable and could harm the transmission if ignored.
- Worse Gas Mileage: Because the engine needs correct speed data for fuel efficiency, wrong readings can mean using more gas than usual.
- Dashboard Warning Lights: Look out for the ABS warning light and the Check Engine Light (CEL). These lights mean there's a problem with the vehicle speed sensor, which can also affect the brakes.
Pay attention to these signs to keep your vehicle running smoothly.
Causes of Nissan P0720 Fault Code
If your Nissan Altima shows a P0720 error code, it means there's an issue with the speed sensor. This sensor tells the car's computer how fast the car is going. When the sensor or its wiring fails, the computer can't get the right speed information. This can cause problems with how the car runs.
Here are the common reasons for the P0720 code:
- Bad Speed Sensor: The sensor might be broken due to internal issues or outside damage.
- Wiring or Connector Problems: Wires can wear out, and connectors can rust, stopping signals from getting through.
- Outside Damage: Physical damage or dirt can stop the sensor from working right.
- Computer Issues: The problem might be with the car's computer, which might've trouble using the speed info because of software or hardware issues.
Checking the speed sensor and its connections can help avoid these issues.
Tools Needed to Diagnose
To figure out why the P0720 code is showing up in a Nissan Altima, you'll need some specific tools.
These tools will help you find out if the problem is with the vehicle speed sensor or its wiring. Here's what you should have:
- Digital Multimeter: Use this to check the resistance and voltage from the speed sensor. Make sure it matches Nissan's specifications.
- OBD-II Scanner: This tool confirms if the P0720 code is present and looks for any other related trouble codes.
- Vehicle Wiring Diagram: This diagram helps you find the speed sensor and see how it's connected, which is useful for troubleshooting.
- Basic Hand Tools: A set of wrenches and screwdrivers to access and possibly replace the speed sensor.
How to Fix P0720 Nissan Error Code – Step by Step
Step 1:
Use a scan tool to confirm the presence of the P0720 error code on your Nissan Altima. Focus on the involvement of the vehicle speed sensor.
Step 2:
Locate the vehicle speed sensor, typically found on the transmission, and inspect it for signs of damage, corrosion, or loose connections.
Step 3:
Use a multimeter to test the sensor's resistance and output voltage, comparing the results to the manufacturer's specifications. If there are discrepancies, the sensor is likely faulty and needs replacement.
Step 4:
Secure a new vehicle speed sensor and carefully install it, ensuring all connections are tight and secure to avoid further complications or repeat failures.
Step 5:
Clear the diagnostic trouble code from your vehicle's system and take your car for a test drive to monitor its performance, ensuring that the error is resolved and no new codes emerge.
Common Diagnosis Mistakes
When dealing with the P0720 code in your Nissan Altima, people often make mistakes that can make the problem last longer. Here are some things to watch out for:
- Blaming the Sensor Too Quickly: People often think the speed sensor is broken without looking at other possible reasons for the issue.
- Ignoring Wiring and Connectors: Before deciding that the sensor is bad, check if there are any broken wires or loose connectors that might be causing strange readings.
- Forgetting to Check the ECM: Sometimes, the engine control module can have issues, which might lead to incorrect P0720 codes. Make sure to consider software problems in the ECM.
- Not Doing the Right Tests: Do complete resistance and voltage tests on the speed sensor. Only looking at it or doing basic tests can lead you in the wrong direction.
P0720 Nissan Repair Cost
Fixing the P0720 code on a Nissan Altima usually costs between $150 and $300. This includes both parts and labor. A new vehicle speed sensor might cost $50 to $150.
Most of the cost comes from labor, which varies by location and the shop you choose. Labor rates can differ a lot, so it's wise to compare different shops and ask for detailed estimates.
Some shops might charge extra for diagnostic time, so ask if it's included in the initial quote. Local repair shops can give you the most accurate estimate. They can check your car's condition and offer advice and estimates.
To save money, get quotes from several places. This helps you find a fair price. Make sure the shop has experience with Nissan cars and knows how to fix the P0720 code properly.
Related Error Codes on Nissan
If your Nissan Altima shows the P0720 code, there could be more issues hiding behind it. These problems often relate to the transmission and vehicle speed sensor.
Here are some common codes that might appear with P0720:
| Code | Description | Effect on Car |
|---|---|---|
| P0721 | Output Speed Sensor Problem | Speedometer might act weird |
| P0722 | Low Output Speed Sensor Signal | Shifts can become rough |
| P0723 | High Output Speed Sensor Signal | Transmission might not work right |
| P0730 | Wrong Gear Ratios | Transmission doesn't perform well |
| P0731 | First Gear Wrong Ratio | Trouble shifting in low gears |
| P0732 | Second Gear Wrong Ratio | Affects mid-range gear shifting |
These codes suggest issues with the transmission or speed sensors. You might notice things like a jumpy speedometer or unusual gear changes. Understanding these codes helps to figure out what's going on with your car.
Can I drive safely with P0720 Nissan?
If your Nissan shows the P0720 code, it's not safe to keep driving.
This code means a problem with the speed sensor, which can make your speedometer act funny and mess up gear shifts.
It's best to get it fixed by a mechanic soon.
People Also Ask
What Is the Function of an Output Speed Sensor in Cars?
The output speed sensor in a car measures how fast the transmission is moving. This helps the car change gears smoothly, saves fuel, and helps the brakes work well by giving the right speed information.
Why Might an Output Speed Sensor Fail Prematurely?
Your car's output speed sensor might stop working too soon because of very hot or cold weather, rust, getting hit, electrical problems, or dirt. These things can mess up how it works and make it not last as long as it should.
How Does Weather Affect the Output Speed Sensor?
Weather can affect your output speed sensor by causing rust, changes in electricity flow, or getting blocked by ice or snow. These problems can make the sensor give wrong readings or stop working altogether.
Can a Faulty Output Speed Sensor Affect Fuel Efficiency?
Yes, a bad output speed sensor can make your car use more fuel. It gives wrong information to the engine, causing it to inject fuel poorly. This makes the engine work less efficiently, which means it uses more gas than it should.
Is the Output Speed Sensor Covered Under Nissan Warranty?
If your Nissan car is less than 3 years old or has driven less than 36,000 miles, the output speed sensor might be covered under warranty. You should check your warranty details or talk to your local Nissan dealership to find out for sure.