Cars with push button starts can be convenient. You don’t have to take your key out to start the car. But sometimes a keyless car won’t start even when you push the button.
It can be very frustrating when your car won’t start.
I outline the reasons why a keyless ignition car won’t start as well as the solutions.
Here’s why your keyless ignition car won’t start:
1. You have a dead battery
A dead or drained battery is a common reason why a keyless ignition car won’t start.
The battery serves as the primary power source to initiate the electrical systems in a car, including starting the engine.
When the battery lacks sufficient charge or is completely drained, it can’t deliver the necessary electrical power to engage the starter motor, which is responsible for cranking the engine.
Signs of a dead or dying car battery include:
- Dimming lights
- The engine cranks slowly or won’t start
- Electrical issues of electrical components which malfunction and can include issues like power windows operating sluggishly, radio or infotainment system resetting or failing.
- Warning lights on the dashboard such as the battery light, check engine light or low voltage warning, indicate potential problems with the battery or the charging system.
- In some cases, a rotten egg or sulfur-like smell might come from the battery area. This odor could indicate a leak in the battery, causing it to overheat or emit gasses.
- An older battery might struggle to hold a charge and show signs of deterioration.
Solution
To resolve a dead battery issue, jump start your car using jumper cables connected to a charged battery or a portable jump starter to provide enough power to start the engine temporarily.
If the battery is old, worn out, or unable to hold a charge, it needs replacement. A mechanic can test the battery’s condition and replace it if necessary.
Regular maintenance, such as checking the battery’s condition, ensuring proper connections, and avoiding leaving electrical components on when the engine is off, helps to prevent a dead battery and the subsequent no-start condition.
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2. The starter motor is faulty
A keyless ignition car that won’t start can be due to a faulty starter motor.
The starter motor initiates the engine’s combustion process by cranking it. When the starter motor fails or malfunctions, it can lead to a silent start.
Signs of a faulty starter motor include:
- The engine cranks slowly or won’t start.
- No noise when the key is turned.
- Freewheeling or whirring noise.
- Smoke or burning smell from the engine area, particularly near the starter motor.
- Repeated need for jump-starts despite having a fully charged battery.
- Visible damage or corrosion of the starter motor which affects its performance.
Solution
Diagnosing a faulty starter motor involves checking the electrical connections, inspecting the starter for physical damage or wear, and testing the electrical components within the starter system.
If the starter motor is indeed the issue, replacing or repairing the faulty parts, or replacing the entire starter assembly is necessary to restore your car’s ability to start properly.
Consult a professional mechanic for an accurate diagnosis and appropriate repair.
Ignoring problems with the starter motor can lead to further damage and potential issues with starting your car.
3. There are issues with the ignition switch
The ignition switch is a critical component that connects the car’s electrical system to the starter motor, allowing the engine to start.
When there are problems with the ignition switch, it can result in a silent start due to no power flow, loose connections or wear, and faulty internal components which prevent the switch from functioning correctly.
In some cases, particularly with modern cars equipped with anti-theft systems, a malfunctioning ignition switch or related security system could prevent the car from starting. If the security system erroneously prevents the ignition switch from engaging, it can result in a no-start condition.
Common signs that suggest issues with the ignition switch are:
- Difficulty starting the car.
- Intermittent power loss while driving which leads to sudden stalling or shutting off of electrical systems while the car is in motion.
- Stalling or engine cut off while driving.
- Dashboard lights flickering.
- Accessories malfunction like power windows, radio, or air conditioning.
- Key not turning in the ignition cylinder, or difficulty in inserting or removing the key.
- The engine not shutting off completely even after removing the key from the ignition.
- Burnt or melted wires of the ignition switch area indicate potential overheating or electrical issues.
Solution
If you notice any of these signs or suspect problems with the ignition switch, have your car inspected and diagnosed by a mechanic.
Depending on the problem detected, repairing or replacing the ignition switch might be necessary to restore the proper flow of electrical signals and allow the car to start normally.
Ignition switch problems can compromise your car’s operation and safety, so addressing these issues promptly is essential to prevent potential accidents or further damage.
Related: Car won’t start after alternator replacement (Here’s why)
4 Corrosion or poor connections
A push start car that won’t start can be caused by corrosion or poor connections in your car’s electrical system, particularly in the battery terminals or cables.
This issue primarily disrupts the flow of electrical current needed to power the starter motor and other critical systems.
Signs of corrosion or poor connections within a car’s electrical system include:
- Dimming or flickering lights
- Electrical malfunctions
- Difficulty starting
- Intermittent power loss to certain systems or accessories in the car.
- Corroded battery terminals
- Stalling or engine cutouts
- Burning smell or smoke due to overheating
- Reduced fuel efficiency. While not a direct electrical symptom, poor connections affecting the car’s engine control systems might result in reduced fuel efficiency or performance issues due to improper electrical signaling.
Solution
Cleaning the terminals: Inspect and clean the battery terminals and cable connections to remove corrosion or buildup. Use a wire brush or terminal cleaner to ensure a good connection between the terminals and cables.
Tightening connections: Ensure that all connections are tight and secure. Loose connections can also lead to problems with the flow of electricity.
Replacing damaged cables: If the cables are severely corroded or damaged, it might be necessary to replace them to restore proper electrical conductivity.
Having a professional mechanic inspect the electrical system, clean corroded terminals, tighten connections, and repair any damaged wiring or components helps prevent further issues and ensure the proper functioning of your car’s electrical system.
Regular maintenance checks can also help prevent corrosion or poor connections from causing significant problems in your car.
5. You have a blown fuse or relay
A push-start car that won’t start can also be caused by blown fuses or faulty relays within the car’s electrical system.
Both fuses and relays are critical components responsible for managing and controlling the flow of electricity to various systems, including the starter motor.
If a critical fuse related to the starting system is blown, it interrupts the electrical supply to the starter motor.
As a result, the starter motor won’t receive the necessary power to engage, causing the car not to start.
In the case of the starting system, a faulty relay can fail to send the signal or power required to activate the starter motor. This failure prevents the starter motor from receiving the necessary electrical current, resulting in a silent start.
Also, when either a fuse related to the starter system blows or a relay malfunctions, it disrupts the electrical circuit needed to power the starter motor.
Without this power supply, the starter motor won’t engage, and the car won’t make any attempt to start or the engine to turn over.
Common symptoms:
- Some electrical components or systems may stop working. This might include the power windows, interior lights, dashboard lights, radio, infotainment system, or specific sensors in the car.
- Certain systems directly related to a blown fuse or faulty relay not functioning such as headlights or turn signals stop working.
- Intermittent operation of certain electrical systems.
- Frequent burnouts of a particular fuse or if relays fail repeatedly.
- Certain warning dashboard lights illuminated.
- No start or no crank.
Solution:
If you notice any of these signs or experience problems with electrical systems or components in your car, check the fuses and relays related to the affected systems.
Occasionally, blown fuses can be identified through a visual inspection of the fuse box.
A blown fuse often has a visibly broken or burnt filament inside the fuse, while a faulty relay might show signs of damage, such as burnt or melted components.
Consult with a mechanic to locate the specific fuses or relays related to the starting system.
They will replace any blown fuses with new ones of the correct amperage rating.
Regular maintenance and periodic checks of fuses and relays can help prevent issues and ensure the proper functioning of the electrical components, preventing a no-start condition due to blown fuses or faulty relays.
6. Neutral safety switch issues
The neutral safety switch (also known as the transmission range sensor or inhibitor switch) is an important component in automatic transmission cars.
It’s designed to prevent the engine from starting unless the transmission is in Park or Neutral. When issues arise with the neutral safety switch, it can lead to a car not starting.
This can happen due to incorrect gear recognition, prevention of starter engagement, electrical disconnection, and starter inhibition.
Common symptoms:
- Starting issues.
- No start in park or neutral.
- Stalling in gear.
- Inability to shift gears.
- No clicking sound when starting.
- Dashboard warning lights.
- Starting in gear.
Solution:
Addressing issues with the neutral safety switch often involves repair or replacement of the switch or related components to ensure proper recognition of the gear position and enable starting the engine normally.
7. Faulty fuel system
A faulty fuel system can contribute to a keyless ignition car not starting, although the fuel system issue might not directly cause the absence of noise.
Nonetheless, if the fuel system is compromised, the engine might not receive the necessary fuel to start, resulting in a silent start.
A faulty fuel system can happen due to fuel delivery problems within the fuel system, such as a clogged fuel filter, a malfunctioning fuel pump, or a fuel line blockage that disrupt the delivery of fuel to the engine, failing fuel pump or fuel pressure, fuel contamination, fuel injector issues and electrical problems with fuel system components.
Common symptoms:
- Engine misfires or stalls.
- Difficulty starting the engine.
- Decreased engine performance such as reduced power, sluggish acceleration, or poor fuel efficiency.
- Engine sputtering or jerking.
- Decreased fuel efficiency.
- Strong fuel odor.
- Illumination of the check engine light on the dashboard.
- Rough idling.
Solution:
While a faulty fuel system can lead to a no-start condition, it’s important to note that it might not directly cause the absence of the noise or clicking sound commonly associated with a malfunctioning starter motor or electrical issues.
However, when addressing a no-start situation due to potential fuel system issues, a diagnostic inspection of the fuel system components, fuel pressure testing, and checks for proper fuel delivery are important steps to identify and resolve the problem.
This should be done by a qualified mechanic.