Why Is The Lawn Mower Solenoid Keeps Going Bad? (Troubleshooting Guide)

A lawn mower solenoid is a vital component that controls the engine’s starter motor. However, it is a common problem for the solenoid to frequently go bad.

This can be caused by a variety of reasons, such as corrosion – wear and tear, or improper wiring. Additionally, using low-quality or old batteries can also lead to solenoid failure.

A faulty solenoid can prevent the engine from starting or cause it to stall while running. It is essential to diagnose and fix the problem – lawn mower solenoid keeps going bad to run it efficiently and effectively.

This article will help you do exactly that!

Why Is The Lawn Mower Solenoid Keeps Going Bad
Why Is The Lawn Mower Solenoid Keeps Going Bad

Signs that Your Lawn Mower Solenoid is Failing

A solenoid failure can be tricky to diagnose as the symptoms overlap with so many other mower-bogging problems. The symptoms of a failing mower solenoid are as follows:

The lawn mower won’t start: If the solenoid is failing, it may not be able to provide the necessary power to start the engine. This can result in a clicking sound when attempting to start the mower.

The engine runs poorly: A failing solenoid can cause the engine to run poorly. This results in a loss of power, stalling, or difficulty starting.

The solenoid clicks but the engine won’t start: If the solenoid is making a clicking sound when the key is turned, but the engine doesn’t start, it’s likely the solenoid is failing.

The battery is not being charged: A failing solenoid may not be able to charge the battery. This results in a dead battery or a battery that won’t hold a charge.

The engine won’t stop running: If the solenoid is failing, it may not be able to shut off the engine when the key is turned off. This can result in the engine continuing to run even when the key is removed.

Burning smell: If the solenoid is failing, it may overheat and emit a burning smell.

Corrosion or rust: A visual inspection of the solenoid may reveal signs of corrosion or rust, indicating that it is failing.

No power to the starter: If the solenoid is failing, it may not be able to send power to the starter, resulting in no power to the starter motor.

What Are the Causes of Solenoid Starter Failure in Lawn Mowers?

Here are the specific reasons why your lawnmower’s solenoid keeps failing:

Dirty or Clogged Air Filters:

A dirty or clogged air filter can restrict airflow to the solenoid, causing it to overheat and eventually fail.

Worn-out Solenoid Contacts:

Over time, the contacts in the solenoid can wear out and become damaged, preventing the solenoid from functioning properly.

Electrical Issues:

A malfunctioning solenoid can be caused by electrical issues such as a faulty ignition switch, a low battery, or a damaged wiring harness.

Heat Damage

The solenoid is exposed to high temperatures, especially during summer. And if there is no proper ventilation, the heat can cause it to malfunction.

Lack of Maintenance:

A lack of regular maintenance, such as oil changes and air filter replacements, can cause the solenoid to fail due to a build-up of dirt and debris.

Cheap Parts:

Using cheap, low-quality parts in the lawn mower can lead to solenoid failure. Because they are not built to withstand the rigors of regular use.


Running the lawn mower for extended periods can cause the solenoid to overheat and fail.

Vibration Damage:

Vibration from the mower can damage the solenoid over time, causing it to malfunction.


The solenoid may wear out over time and need replacement. Especially if the lawn mower has been used frequently over the years.


Exposure to extreme weather conditions, such as rain or snow, can damage the solenoid, causing it to malfunction.

Note: A failing solenoid can also be caused by other issues such as a bad battery, wiring issues, or a faulty starter motor. If you suspect your solenoid is failing, it is best to consult a professional to diagnose and repair the issue.

Fixing Lawn Mower Solenoid Keeps Going Bad: Replace it!

Follow these steps to troubleshoot a failed lawn mower solenoid:

Step 1: Charge The Battery Full

First, make sure that your battery has not voltage below than 12.3 in it. Then wait till your battery is charged fully.

Step -2: Locate the Solenoid

It is typically located near the battery on the lawn mower. It may be mounted on the side of the engine or the fender.

Step 3: Check all the Connections

Make sure that the connections to the solenoid are clean and tight. If they are dirty or loose, clean them with a wire brush and tighten them before deciding about replacing the solenoid.

Step 4: Check the Contunuity or Bypass the Solenoid

Use a multimeter to test the solenoid for continuity. If there is no continuity, the solenoid is likely faulty and needs to be replaced.

You can also use a screwdriver to touch two cables – one is from battery and another one is from the starter. If the mower starts, it will indicate that the solenoid is damged or needs to be replaced.

Step 5: Replace Faulty Solenoid

If the solenoid is faulty, remove it from the lawn mower and replace it with a new one. Make sure to use the same type of solenoid as the original.

(If the solenoid is not the problem, check the wiring for any frayed or damaged wires. If any are found, repair or replace them.

Make sure the battery is fully charged and in good working condition. If the battery is dead, the lawn mower will not start.)

Note: Always read the manual for instructions specific to your lawn mower model before attempting any repairs.

When to Call a Professional for Lawn Mower Solenoid Repairs

Attempting to repair the solenoid yourself can be dangerous and may cause further damage to your lawn mower. A professional will have the knowledge and tools to properly diagnose and repair the issue.

Some signs that your lawn mower’s solenoid may need professional repairs include:

  • Difficulty starting the lawn mower or a clicking sound when attempting to start it.
  • The lawn mower started but stalled shortly after starting.
  • Smoke or a burning smell coming from the lawn mower.
  • The lawn mower not responding to the throttle or accelerator.
  • If you are experiencing any of these issues, it is best to call a professional for repairs.

The Cost of Replacing a Lawn Mower Solenoid

The Average Cost for a Solenoid Replacement Ranges from $40 to $100.

The cost of replacing a lawn mower solenoid can vary depending on the brand and model of the lawn mower and the location of the repair.

Depending on the situation, the cost can be as low as $20 for a replacement solenoid. But it can also go up to $150.

The cost of labor can also vary, between $50 to $75 which can go up to $100. It is important to note that the cost of a replacement solenoid will also depend on the location and availability of the part.

Difficult to find replacement solenoids for older or discontinued models can increase the cost.

Overall, it is recommended to get a quote from a reputable repair shop or check with the manufacturer for pricing and availability before proceeding with a solenoid replacement.

Frequently Asked Questions (FAQs)

Can I test my lawn mower solenoid to see if it is working?

Yes, you can test a lawn mower solenoid by checking for continuity with a multimeter. If there is continuity, the solenoid is working properly.

Can a lawn mower solenoid be repaired or does it need to be replaced?

In most cases, a lawn mower solenoid will need to be replaced if it is malfunctioning. However, in some cases, it may be possible to repair a solenoid by cleaning or replacing a damaged component.

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