By Ezra Lane When your Nissan displays the P1720 code, it indicates a problem with the vehicle speed sensor (VSS), which could lead to inaccurate speed readings, erratic speedometer behavior, and potential transmission shifting issues. You might notice that your speedometer fluctuates or shows incorrect speeds, and your fuel mileage could decrease. The usual suspects include a faulty VSS or wiring problems, often due to corrosion or loose connections. Diagnosing this involves using an OBD-II scanner, a digital multimeter to check VSS resistance, and possibly replacing the sensor if it's defective. Ignoring this issue can lead to unsafe driving conditions, so it's important to handle it promptly for both safety and vehicle functionality. Exploring further will unveil more about managing and rectifying this error effectively.
P1720 Nissan Code Meaning
The P1720 Nissan code indicates a problem with the vehicle's speed sensor output, possibly due to sensor malfunction or wiring issues.
Check and inspect the sensor and wiring on the transmission for damage.
If needed, perform electrical tests or replace the sensor for accurate diagnostics.
Error Code P1720 Symptoms
When you see the P1720 error code, it usually means there's a problem with your car's speed sensor. Here are some signs to watch for:
- Speedometer Problems: Your speedometer might jump around or show the wrong speed. This happens when the car's computer isn't getting the right info from the speed sensor.
- Transmission Trouble: You might've issues with shifting gears smoothly. The transmission needs speed data to work right, and without it, you might notice rough shifting or trouble changing gears.
- Worse Fuel Mileage: If the speed sensor isn't working, you might use more fuel than usual. The car's engine system needs accurate speed info to manage fuel and spark timing, and without it, your car may not run as efficiently.
- Check Engine Light: If the check engine light is on, it could be due to the P1720 code. This light shows up when the car's system finds a problem.
These are signs that you might be dealing with a P1720 code and should check your car to avoid more issues.
Causes of Nissan P1720 Fault Code
If you're dealing with the P1720 error code in your Nissan, here are some possible reasons why this might happen:
- Bad Speed Sensor: This sensor checks how fast your car is going. If it's broken, your car's computer might get wrong info, causing the P1720 code.
- Wiring Issues: The wires or connectors for the speed sensor might be rusted, worn out, or loose. This can mess up the data the sensor sends.
- Transmission Control Problems: The Transmission Control Module reads the data from the speed sensor. If it's not working right, it might see good signals as errors.
- Installation Mistakes or Modifications: If the speed sensor isn't put in correctly or there are unofficial changes, it mightn't give accurate readings.
To find out what's wrong, check each part carefully.
Make sure everything fits with Nissan's guidelines.
Tools Needed to Diagnose
To figure out the P1720 Nissan code, you'll need some specific tools. Having the right equipment can help you identify the issue faster. Here's what you need:
- OBD-II Scanner: This tool reads the problem codes from your car's system. Make sure it's compatible with Nissan cars.
- Digital Multimeter (DMM): Use this to check the voltage and resistance in the vehicle speed sensor circuit. It helps see if the electrical values are correct.
- Oscilloscope: This tool shows the waveforms of electrical signals in the vehicle speed sensor circuit. It's helpful for finding issues that a regular multimeter might miss.
- Vehicle Service Manual: This manual is for your specific Nissan model. It gives you important information like wiring diagrams, where parts are located, and steps to fix problems.
Having these tools can help you find out what's wrong with the P1720 error code in your car.
How to Fix P1720 Nissan Error Code – Step by Step
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Step 1:
Verify the Error Code – Use an OBD-II scanner to confirm that P1720 is the only code present.
If other codes are there, address them first, as they might be related.
Step 2:
Inspect the Vehicle Speed Sensor (VSS) – Locate the VSS near the transmission.
Check for any visible damage to the sensor or its wiring. Corrosion or loose connections can often cause this error.
Step 3:
Test the VSS – Disconnect the sensor and use a multimeter to check its resistance.
Compare your readings with the standard values specified in your Nissan's service manual.
Step 4:
Replace the Sensor if Necessary – If the sensor is faulty, replace it.
Ensure you get a compatible VSS for your model.
Step 5:
Clear the Code – After replacing the sensor, clear the error code using the OBD-II scanner.
This step is crucial to reset the system and verify the fix.
Common Diagnosis Mistakes
When dealing with the P1720 Nissan code, avoid these common mistakes:
- Check the Wiring: The issue mightn't be with the sensor itself. Look at the wiring for any damage or wear.
- Look at Other Parts: The speed sensor works with other systems. Check the ECM and transmission control module as they might be causing the error.
- Don't Rely Only on Error Codes: A P1720 code might show up, but that's not enough. Test more to see if there are other problems causing the sensor to act up.
- Do Calibration Checks: After you change the speed sensor, do the calibration. This ensures the readings are correct and prevents further issues.
P1720 Nissan Repair Cost
When you need to fix the P1720 Nissan code, the cost depends on the problem. If it's just a broken speed sensor, you'll pay between $200 and $400. This covers the part and the labor. The sensor itself costs around $50 to $150, and the rest is for the mechanic's work, which can range from $150 to $250.
If the issue affects the transmission, the repair costs can rise. Fixing transmission problems can be expensive, from $1,000 to over $4,000. The price depends on how bad the damage is and what kind of repair you need, like replacing the whole transmission or just fixing a part.
Make sure to get the right diagnosis. Talk to a mechanic you trust to find out what's wrong and how much it will cost to fix. This helps you avoid spending extra money on the wrong repairs or waiting too long to fix the problem.
Related Error Codes on Nissan
Learn about common error codes for your Nissan to identify issues easily. These codes relate to parts of your car that could impact how it runs. If you see the P1720 code, knowing other related codes can be helpful.
Here's a simple guide to some related error codes:
| Code | Description | Affected Part |
|---|---|---|
| P0500 | Problem with vehicle speed sensor | Speedometer, Odometer |
| P0720 | Problem with output speed sensor circuit | Transmission Output |
| P0731 | Incorrect gear ratio for gear 1 | Transmission Gear Ratio |
| P0335 | Problem with crankshaft position sensor circuit | Engine Timing |
These codes help you spot possible issues that might have similar symptoms or are connected. For example, P0720 also involves a speed sensor but focuses on the transmission output rather than the vehicle's speed like P1720. Keep this table as a quick reference when checking for problems.
Can I drive safely with P1720 Nissan?
If your Nissan shows the P1720 code, it's not safe to drive.
This means there's a problem with the vehicle speed sensor. It can make your car act unpredictably and lead to accidents.
Get it checked and fixed right away to stay safe.
People Also Ask
What Alternative Vehicles Exhibit Similar Issues as Nissan With the P1720 Code?
Cars like Honda and Toyota can have similar problems with their speed sensors. This might cause error codes and make the transmission not work right, just like the Nissan P1720 code issue you're looking into.
How Does Weather Affect the P1720 Error in Nissan Vehicles?
Bad weather can make Nissan cars have sensor problems. When it is really cold or wet, these sensors might not work right. This can cause the car to show a P1720 error, affecting how it detects speed and how the transmission works.
Can DIY Repairs Permanently Fix the P1720 Error, or Is Professional Service Recommended?
DIY repairs might help for a little while, but it's better to get a professional to fix the P1720 error. They know how to solve the problem for good and can stop any future issues from happening because they know what they're doing.
Are There Any Recalls Associated With the P1720 Nissan Code?
As of now, there are no recalls linked to the P1720 Nissan code. It's a good idea to ask a Nissan dealer or a trusted mechanic to get the latest and most accurate information about your car.
How Does the P1720 Code Impact a Nissan's Resale Value?
The P1720 code can make your Nissan worth less when selling. Buyers might worry about costly transmission problems. It's a good idea to fix this issue before selling your car to make sure you get the best price.