Nissan Sentra Speed Sensor Guide: 2005-2016 Problems and Replacement
If your Sentra's transmission is shifting erratically or the speedometer is acting up, a bad speed sensor could be the cause.
- Use an OBD-II scanner first to identify the specific fault code (e.g., P0720 vs. P0717) to know if you need an input or output sensor.
- Symptoms of a bad speed sensor are very similar to more serious CVT transmission failure; the sensor is an inexpensive first step in diagnosis.
- This is a DIY-friendly repair that can be done with basic tools in under an hour.
- There are no specific recalls for the speed sensors, but many for the CVT transmission which can present similar issues.
Is Your Sentra Speed Sensor Failing? Common Symptoms
A failing speed sensor on a 2005-2016 Sentra can cause problems that are often mistaken for serious transmission failure. Because many Sentras in this generation use a sensitive CVT, it's important to diagnose sensor issues correctly. Watch for these common signs:
🎬 Watch: 5 common symptoms of a bad transmission speed sensor.- Check Engine Light: This is the most common symptom. A scanner will usually show codes like P0720 (Output Sensor) or P0717 (Input Sensor).
- Erratic or Failed Speedometer: The speedometer needle may jump around, show the wrong speed, or not move at all.
- Harsh or Delayed Shifting: With a CVT, this can feel like shuddering, hesitation, or a sudden loss of power. The transmission may also feel like it's slipping or stuck in one gear.
- Limp Mode: The vehicle may limit engine power and speed to prevent damage, making it slow to accelerate.
- Cruise Control Not Working: The cruise control system relies on accurate speed data and will shut off if the sensor signal is lost.
Input vs. Output Sensor: Which One Is Bad?
Your Sentra has both an input and an output speed sensor, and they are not interchangeable. The only reliable way to know which one has failed is by using an OBD-II scanner.
- Code P0717 or similar points to the Input Speed Sensor.
- Code P0720 or similar points to the Output Speed Sensor (also called the Vehicle Speed Sensor or VSS).
- Code P0725 (Engine Speed Input Circuit) is also common. This code means the transmission computer isn't getting a reliable engine RPM signal. While it can be caused by a speed sensor or wiring, it's very often caused by a failing crankshaft position sensor on Nissans.
Replacing the wrong sensor will not fix the problem. Always scan for codes before buying parts.
Choosing the Right Aftermarket Speed Sensor
When it comes to electronic sensors for your Sentra, there is a debate between OEM and aftermarket quality. While OEM (Original Equipment Manufacturer) sensors are a guaranteed fit and quality, they come at a high cost. Aftermarket sensors offer significant savings.
For a simple, external part like a speed sensor, a quality aftermarket part from a reputable brand is often a reliable and cost-effective choice. Brands like SKP, NTK, and Beck/Arnley are known to be dependable options. However, be cautious of the cheapest, unbranded sensors. These can sometimes have poor quality control, leading to inaccurate readings or premature failure, which could mimic the symptoms of a more expensive transmission problem. For critical electronics on a Nissan, spending a few extra dollars on a recognized aftermarket brand over a generic one is a wise investment.
A Note on CVT Issues
The CVT transmissions in 2007-2016 Sentras are known for issues like juddering and hesitation. While a bad speed sensor can cause these symptoms, they can also be signs of a larger transmission problem. If replacing the correct speed sensor doesn't fix the issue, the problem may lie within the CVT itself.
🎬 Watch: Why your Nissan CVT is shaking and how to diagnose it.Speed Sensor Replacement Cost for 2005-2016 Nissan Sentra
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Speed Sensor | $25 - $85 |
| New OEM Nissan Speed Sensor | $150 - $240 |
| Shop Labor Cost | $75 - $150 |
Frequently Asked Questions (FAQ)
Can I replace the Sentra speed sensor myself?
Yes, this is a very DIY-friendly job for most people. The sensors are on the outside of the transmission and held by a single 10mm bolt. You may need to remove the battery and battery tray or an under-vehicle splash shield to get access, but it typically requires only basic hand tools.
How many speed sensors does my Sentra have?
Most 2005-2016 Sentras with an automatic or CVT transmission have two main transmission speed sensors: one input and one output. Your car also has four ABS wheel speed sensors, but those are different parts and typically set ABS-specific codes.
Are there any recalls for the speed sensor?
No, there are no specific recalls from Nissan or the NHTSA for the transmission speed sensors on the 2005-2016 Sentra. However, there have been numerous recalls and service campaigns for the CVT transmission that can cause similar symptoms. It is always a good idea to check for any open recalls on your vehicle's VIN.
Will a new speed sensor fix my Sentra's transmission shudder?
It might, but it's not a guarantee. If the shudder is caused by the transmission receiving bad data from a faulty sensor, then a new sensor will fix it. However, CVT shudder is a well-known issue that can also be caused by old fluid, internal wear, or valve body problems, which a new sensor will not solve.
Helpful Videos
Technical Specifications
OEM Part Numbers: 31935-1XF0D 31935-8E006 31935-8E007
Most 2005-2016 Sentras use two transmission speed sensors: an input sensor and an output sensor. They are typically held in by a single 10mm bolt and have a 3-pin electrical connector.
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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