What Does the Neutral Safety Switch Do? Symptoms, Replacement Cost, and FAQs

In this article, we’ll discuss the vehicle part responsible for making vehicle startup safe–the neutral safety switch.

What Is a Neutral Safety Switch?

The neutral safety switch prevents the vehicle from starting if the vehicle’s transmission is in gear.

In an automatic transmission vehicle, the neutral safety switch only allows current to pass to the starter motor when the gear lever is set to either the neutral or park position. The neutral safety switch is typically connected to the shifting linkage and located on the side of the transmission.

However, if the vehicle is equipped with a shifter that’s mounted on the steering column, then the switch will also be located near the steering column. Modern vehicles that use a shift-by-wire transmission system have a transmission position sensor that also serves as the neutral safety switch.

In a manual transmission vehicle, the neutral safety switch is also called the clutch safety switch. It has the same purpose, but it requires the driver to press down on the clutch before the switch allows current to pass to the starter motor.

Typically, the neutral safety switch and the backup lamp switch are parts of the same component.

With the onset of electronic transmissions, the computer controlling the transmission also received transmission range information (PNDRL) and the switch is designated as the TR sensor or some similar term.

Typically, the neutral safety switch and the backup lamp switch are parts of the same component.

– Richard McCuistian, ASE Certified Master Automobile Technician

Bad Neutral Safety Switch Symptoms

A bad neutral safety switch can cause the vehicle’s starter motor to crank the engine while the transmission is in gear rather than in park or neutral. In that case, the engine will typically start and the vehicle will begin to move unexpectedly. Here are some symptoms:

The Engine Cranks In Either Neutral or Park But Not Both

Automatic transmission vehicles should only be able to start when the gear lever is set to either neutral or park. However, if the engine cranks only when the gear lever is set on either one of the positions, then there’s likely something wrong with the neutral safety switch. For example, if the starter won’t work in park but it will work in neutral, the switch may be out of adjustment or faulty.

The Engine Refuses to Start Regardless of the Gear

If the previous problem worsens, it can result in the engine refusing to crank regardless of the selected gear. This symptom can be caused by other electrical issues like a faulty relay or blown fuse. However, if there is an electrical problem with the switch itself, then it will need to be replaced. A faulty neutral safety switch prevents power from flowing to the starter motor even when the gear lever is in the correct position.

The Engine Starts on Any Gear

If your vehicle is experiencing this symptom, then the neutral safety switch isn’t functioning anymore. This could be caused by a shorted neutral safety switch. This is a safety hazard since the vehicle may start in gear and move, which may cause an accident. You should replace the neutral safety switch as soon as possible.

Testing the Neutral Safety Switch

The procedure for testing the neutral safety switch varies from vehicle to vehicle. There are online resources such as videos and articles that can give you more information on what the process involves. You’ll need a multimeter to be able to do it. Take note that the neutral safety switch’s location can vary depending on the vehicle model. Additionally, this part might be difficult to access and it might involve checking other wires. It would be best to leave the job to a professional, especially if you’re not experienced when it comes to vehicle repairs.

How Much Does a Replacement Neutral Safety Switch Cost?

A replacement neutral safety switch can cost anywhere between $30 and $550 for parts alone. Labor can cost around $61 to $78. Take note that these are just rough estimates. You might have to factor in expenses for other related repairs.

How to Fix a Neutral Safety Switch?

Repairing or replacing a neutral safety switch depends on the vehicle. Vehicle configurations can vary, and some neutral safety switches will be harder to access on some vehicles than others. At the same time, the neutral safety switch’s design can also vary. If you think your neutral safety switch is faulty, then the best course of action is to have a trusted mechanic inspect your vehicle right away.

Other Notes About the Neutral Safety Switch

Before the neutral safety switch was added, a lapse in judgment can cause a vehicle to jump off a trailer ramp or get an innocent bystander run over. Luckily, the automotive industry made cars significantly safer during the 60’s when neutral safety switches and other safety features like seat belts were made standard on vehicles.

What Causes the Neutral Safety Switch to Malfunction?

As a vehicle ages, it’s common for components in the undercarriage to be exposed to dirt, moisture, and heat. When this happens, metal components can corrode. Since the neutral safety switch is housed in the transmission case or the linkage, it’s regularly exposed to those elements which will naturally cause it to wear out.

Buying a Neutral Safety Switch Replacement

When the neutral safety switch is malfunctioning, it can cause your vehicle to move unexpectedly. This can lead to a number of dangerous situations. As a result, we recommend repairing or replacing the neutral safety switch as soon as possible. Luckily, you can find the parts you need here at CarParts.com.

We offer a wide selection of trusted aftermarket brands on our easy-to-navigate website. Enjoy the convenience of shopping online for the parts you need and the peace of mind that comes from a 60-day return policy. We’re here to offer it all to you at competitive prices with a lifetime replacement guarantee.

If you place an order now for a neutral safety switch, you can expect your part to arrive in as fast as two business days.