By Ezra Lane Your 2004 Nissan Altima displaying the P0720 error code suggests an issue with the output speed sensor circuit, which affects how the vehicle's speedometer reads and how smoothly it shifts gears. You'll notice symptoms like incorrect speedometer readings, jerky or delayed gear shifts, and potential stalling. The sensor, its wiring, or connections might be damaged, corroded, or loose, necessitating a careful inspection and possible replacement. Accurate diagnostics typically require a professional mechanic equipped with an OBD-II scanner and a multimeter. Costs can vary, roughly between $150 and $300, depending largely on part prices and labor rates. To ensure continued functionality and safety, solving this quickly is advisable.
P0720 Nissan Code Meaning
The P0720 code on a 2004 Nissan Altima indicates an output speed sensor circuit issue, affecting fuel injection and transmission timing.
Inspect the vehicle speed sensor, connections, and wiring for damage.
Repair or replace faulty components to restore proper data flow to the engine control module.
Error Code P0720 Symptoms
When your 2004 Nissan Altima shows the P0720 error code, you'll likely see the check engine light first.
But that's not the only sign. Other things may happen that can change how your car drives.
Here are some problems to watch for:
- Speedometer Problems: Your speedometer mightn't show the right speed. This can cause issues, especially if you're driving too fast or too slow without realizing it.
- Rough or Slow Gear Changes: The car mightn't switch gears smoothly. You could feel a jolt or have to wait longer when you try to speed up. This can make driving feel less comfortable.
- Weak Power and Acceleration: The car mightn't speed up like it used to when you press the gas pedal. This could make it hard to keep up with traffic or drive safely on highways.
You might also notice your car stalling or idling roughly.
This points to issues with the speed sensor circuit. Addressing these problems can help keep your car running well.
Causes of Nissan P0720 Fault Code
If your 2004 Nissan Altima shows the P0720 code, it means there's an issue with the output speed sensor circuit. This sensor helps the car's computer know how fast the car is going.
Here are possible reasons for the error:
- Bad Speed Sensor: The sensor may not be working properly due to internal problems or damage from things on the road. If it stops working, it can't send correct speed info to the car's computer, causing the P0720 code to show up.
- Worn or Broken Wires and Connectors: The wires and connectors linked to the speed sensor might be worn out or damaged. This messes up the signal sent to the car's computer. Check these parts for any signs of damage or disconnection.
- Corrosion or Software Problems: Corrosion on the sensor can stop it from working well. Also, the car's computer program might've bugs or need an update, which could cause the error code to appear.
Checking these areas can help find out what's wrong.
Tools Needed to Diagnose
To figure out the P0720 error code on a 2004 Nissan Altima, you'll need a few tools to check things properly. These tools help you find out if the problem is with the output speed sensor or the wiring.
- OBD-II Scanner: Use this tool to read the error codes from the car's computer. It also lets you see live data from the speed sensor, so you can check how well it's working.
- Digital Multimeter: This tool helps you check the voltage and resistance in the speed sensor's wires. Make sure the numbers match what's normal for your car model.
- Wiring Diagram: Get a wiring diagram for your car. It helps you follow the wires and find any problems with connections.
You might also need some basic tools and maybe an oscilloscope to look deeper into the issue.
Have these tools ready before you start checking the P0720 code on your car.
How to Fix P0720 Nissan Error Code – Step by Step
Step 1:
Start by scanning your Nissan Altima with an OBD-II scanner. This will confirm the presence of the P0720 error code and help identify any additional codes that may be present.
Step 2:
Conduct a thorough visual inspection of the vehicle speed sensor, its wiring, and connectors. Check for signs of damage, corrosion, or loose connections that could be affecting signal transmission.
Step 3:
If you find any issues during the inspection, focus on the vehicle speed sensor. If it appears faulty, replace it with a new sensor. Ensure that the new sensor is properly seated and connected to avoid future problems.
Step 4:
After replacing the sensor, clear the P0720 code from the ECM memory using the OBD-II scanner.
Step 5:
Take your Altima for a test drive to confirm that the vehicle speed readings and shifting behavior have returned to normal. If the P0720 code reappears, further diagnostics on the ECM or other related components in the vehicle speed sensor circuit might be necessary.
Common Diagnosis Mistakes
When fixing the P0720 error code on your Nissan Altima, be aware of common mistakes that can make the process harder. Here are some errors to avoid:
- Thinking the Sensor is Broken: Don't rush to change the vehicle speed sensor (VSS). First, look for broken wires or rusty connectors that might be causing the problem.
- Ignoring Other Signs: If your car shifts roughly or stalls, you might think it's the VSS. These issues can also come from other transmission or engine problems. Check all possible causes first.
- Not Checking Live Data: You might skip using a scan tool to see live data, thinking you've found the problem. This live data can show issues that static tests miss.
P0720 Nissan Repair Cost
Fixing the P0720 code on a 2004 Nissan Altima usually costs between $150 and $300. This includes both parts and labor. The main expense is often the vehicle speed sensor, which can cost between $50 and $150.
Labor costs can vary. Dealerships might charge more, while independent shops could be cheaper. Don't forget about diagnostic fees. Some places include these in the labor cost, while others charge separately. These fees cover the time spent identifying the issue with your Altima.
Sometimes, the problem may also involve wiring repairs or ECM (Engine Control Module) checks. These extra repairs can add to the cost.
It's a good idea to get several quotes to compare prices. This way, you ensure that you're not overpaying and getting good service. Check reviews or ask around for a reliable mechanic.
Related Error Codes on Nissan
When you see a P0720 code on your Nissan, other error codes might show up too. These can help you understand what's going wrong. Here's what they mean:
| Code | Description | Impact on Vehicle |
|---|---|---|
| P0721 | Output Speed Sensor Issue | Can cause wrong speed readings |
| P0722 | No Output Speed Sensor Signal | No speed data reaches the ECM |
| P0730 | Wrong Gear Ratio | Possible transmission problems |
P0721 and P0722 relate directly to the output speed sensor. P0721 means there might be a problem with the sensor, maybe it's wearing out or partly failing. This can lead to incorrect speed information reaching the car's control unit, which might mess up how the car shifts gears.
P0722 is more serious. It means the car isn't getting any speed information at all. This can cause big problems, like transmission issues or making the car switch to a safe mode to avoid damage.
P0730 isn't directly linked to the sensor, but it can show up due to sensor problems affecting gear ratios. This mismatch can cause mechanical stress and potential harm if not fixed. Each of these codes needs careful checking to avoid bigger repair bills and keep the car safe to drive.
Can I drive safely with P0720 Nissan?
Driving with a P0720 code in your Nissan isn't safe.
It means there's a problem with a sensor that affects your car's speed, shifting, and engine power.
These issues can lead to accidents.
Get it fixed by a mechanic before driving.
People Also Ask
Does Altitude Affect the P0720 Error Code on a 2004 Nissan Altima?
Yes, high altitude can affect your car's engine, making it run differently. This might cause the speed sensor to give wrong readings, leading to a P0720 error code in your 2004 Nissan Altima.
Will a P0720 Code Trigger the Check Engine Light?
Yes, a P0720 code will make the check engine light turn on. This code means there's a problem with the car's speed sensor. If not fixed, it can cause the car to shift gears oddly or use more gas than usual.
How Often Does the Output Speed Sensor Fail in Nissans?
The output speed sensor in Nissans usually starts having problems after 100,000 to 150,000 miles. Things like weather and electrical issues can make it fail sooner. It's important to check it regularly so you can fix any problems early.
Can Transmission Fluid Quality Impact the P0720 Code Occurrence?
Yes, bad transmission fluid can cause car problems. If the fluid is dirty or old, it might make a sensor not work right. This can lead to error codes like P0720, which means there's a problem with the vehicle speed sensor.
Is the P0720 Code Specific to Nissan or Is It Universal?
The P0720 code is not just for Nissan cars. It is a common code for many different car brands and models. This code shows there might be a problem with the vehicle speed sensor, which helps the car know how fast it's going.