A Guide to the 2007-2013 Nissan Sentra Neutral Safety Switch
Solve common no-start problems and erratic shifting in your Sentra by understanding this critical transmission part.
- A classic symptom of failure is the car starting in Neutral but not in Park.
- A faulty switch can cause a no-start condition and trigger the P0705 check engine code.
- Replacement is moderately difficult, requiring removal of the battery and tray for access.
- Proper alignment of the new switch is critical for the car to start after installation.
Is Your Sentra Refusing to Start? It Might Be the Neutral Safety Switch
If you turn the key in your 2007-2013 Sentra and nothing happens, you might blame the battery or starter. However, a faulty neutral safety switch is a common cause for a no-crank situation. This switch can wear out over time, leading to frustrating and intermittent starting problems. It can also cause other issues, like making the transmission behave poorly, because the computer doesn't know what gear the car is in.
Common Symptoms of Failure
Look out for these specific signs that your Sentra's neutral safety switch is going bad:
- Starts in Neutral, Not Park: The most common symptom is when the car won't start in Park but will start if you shift to Neutral.
- Intermittent No-Start: The car fails to crank randomly, but all the dashboard lights and radio turn on.
- Check Engine Light: A failure in the switch's circuit will often trigger the check engine light with a P0705 code.
- No Reverse Lights: The switch is often responsible for turning on the backup lights, so if they stop working, the switch could be the cause.
- Starts in Any Gear: In severe cases, the switch may fail completely and allow the car to start in Drive or Reverse. This is a critical safety issue that needs immediate attention.
Choosing the Right Aftermarket Switch
When replacing the neutral safety switch, you don't have to buy the expensive OEM part. Several aftermarket brands offer quality replacements. Here’s a look at the available options:
- Standard Ignition (SMP): A well-regarded brand known for producing parts that meet or exceed original specifications. They emphasize quality control and testing, making them a reliable, go-to choice for many repair shops.
- Facet: A European-based manufacturer that claims its parts are equal or superior in quality to original components. They control their entire production process, which is a good sign of quality.
- Rostra Powertrain: This brand specializes in transmission components and automotive electronics. While not as widely reviewed by consumers, they are an established name in the powertrain parts industry.
Pro Tip: The large price difference between aftermarket parts often comes down to what's included. A cheaper part might just be the sensor itself, while a more expensive one could be a complete kit with a new wiring harness and bracket. For a part this critical, choosing a reputable brand like Standard or Facet is a smart investment.
Cost of Replacing a 2007-2013 Sentra Neutral Safety Switch
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Part | $35 - $184 |
| Shop Labor | $120 - $250 |
| Total Estimated Cost | $155 - $434 |
Frequently Asked Questions
Is this a difficult part to replace myself?
It's moderately difficult. The switch is located on the driver's side of the transmission. You will need to remove the battery and the battery tray to access it. The most critical step is correctly aligning the new switch; if it's not aligned, the car won't start. This is a manageable job for a DIYer with basic tools and patience.
🎬 Watch this step-by-step guide to diagnose and replace the switch.Are there any recalls for this part on my Sentra?
No. While there have been recalls for the 2007-2013 Nissan Sentra for issues like airbags and tie rods, there are no specific recalls for the neutral safety switch.
Why does my car start in Neutral but not in Park?
This happens when the electrical contacts inside the switch that detect the 'Park' position have worn out, but the contacts for 'Neutral' still work. It can also mean the switch is slightly out of alignment. This is the most definitive symptom of a failing neutral safety switch.
🎬 See why your car starts in neutral but not park.Can I just bypass the neutral safety switch?
You should not bypass the switch. It is an essential safety feature that prevents the car from starting in gear and moving unexpectedly. Bypassing it creates a serious safety risk for you and others.
Helpful Videos
Technical Specifications
OEM Part Numbers: 31918-3XX0A 31918-X420A 31918-3AX00 31918-31X13
For CVT automatic transmissions, the switch is located on the driver's side of the transmission case. For manual transmissions, it is on the rear extension housing. The part is also known as a Transmission Range Sensor or Inhibitor Switch.
We Have This Part in Stock
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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