Why Won’t My Hyundai Sonata Hybrid Start? How To Troubleshoot And Fix It

Hyundai Sonata Hybrid is a popular midsize sedan that combines a gasoline engine and an electric motor to offer better fuel efficiency and lower emissions.

Why Won’t My Hyundai Sonata Hybrid Start?
Why Won’t My Hyundai Sonata Hybrid Start?

However, like any other car, it can sometimes fail to start due to various reasons.

In this article, we will explore some of the possible causes and solutions for a Hyundai Sonata Hybrid that won’t start.

 

Dead 12-Volt Battery

One of the most common reasons why a Hyundai Sonata Hybrid won’t start is a dead 12-volt battery.

This is the conventional battery that powers the accessories, lights, and starter motor of the car.

If the 12-volt battery is drained or faulty, the car will not be able to turn on the ignition or crank the engine.

To check if the 12-volt battery is the problem, you can try to jump-start the car using another vehicle or a portable booster pack.

If the car starts after jump-starting, then the 12-volt battery is likely the culprit.

You should then drive the car to a mechanic or an auto parts store to have the battery tested and replaced if necessary.

Alternatively, you can use a multimeter to measure the voltage of the 12-volt battery.

A fully charged 12-volt battery should have around 12.6 volts when the car is off and around 14 volts when the car is running.

If the voltage is below 12 volts when the car is off, then the battery is likely dead or dying.

 

Faulty High-Voltage Battery

Another possible reason why a Hyundai Sonata Hybrid won’t start is a faulty high-voltage battery.

2018 Hyundai SRemote Start Shop
2018 Hyundai Sonata Remote Start Shop [PHOTO COURTESY OF MYKEY PREMIUM]
This is the rechargeable battery that powers the electric motor and assists the gasoline engine.

If the high-voltage battery is depleted or damaged, the car will not be able to run on electric mode or hybrid mode.

To check if the high-voltage battery is the problem, you can look at the dashboard display and see if there is a warning light or message indicating a hybrid system malfunction.

You can also use a scan tool to read any trouble codes related to the hybrid system.

Some of the common codes that indicate a high-voltage battery problem are P0A80, P0A7F, P0AFA, and P3006.

If you suspect that the high-voltage battery is the problem, you should take your car to a qualified hybrid technician as soon as possible.

The high-voltage battery is a complex and expensive component that requires special tools and skills to diagnose and repair.

Do not attempt to service or replace the high-voltage battery yourself, as it can pose serious safety risks.

READ ALSO : How To Unlock Hyundai Steering Wheel? 3 Easy Methods

Bad Starter Motor or Relay

A third possible reason why a Hyundai Sonata Hybrid won’t start is a bad starter motor or relay.

 

The starter motor is an electric motor that spins the engine when you turn the key or press the button to start the car.

Starter relay is an electrical switch that controls the power supply to the starter motor.

If either of these components fails, the engine will not be able to crank or fire up.

To check if the starter motor or relay is the problem, you can listen for any clicking or grinding noises when you try to start the car.

A clicking noise usually indicates a bad starter relay, while a grinding noise usually indicates a bad starter motor.

You can also use a test light or a multimeter to check for power at the starter motor terminals when someone tries to start the car.

If there is no power at the starter motor, then the starter relay may be faulty.

However, you should be careful not to touch any high-voltage wires or components when working on your hybrid car.

If you confirm that the starter motor or relay is the problem, you can replace them yourself if you have some mechanical skills and tools.

Alternatively, you can take your car to a mechanic and have them replace the starter motor or relay for you.

Other Possible Causes

There are many other possible causes why a Hyundai Sonata Hybrid won’t start, such as:

– A bad ignition switch or key fob
– A blown fuse or relay
– A faulty fuel pump or filter
– A clogged catalytic converter
– A defective spark plug or coil
– A broken timing belt or chain
– A low oil level or pressure
– A corrupted engine control module

To diagnose these problems, you will need to use a scan tool to read any trouble codes stored in your car’s computer.

You will also need to perform some basic tests and inspections on your car’s components and systems.

Depending on your skill level and tools, you may be able to fix some of these problems yourself, or you may need to take your car to a professional for further diagnosis and repair.

Conclusion

A Hyundai Sonata Hybrid that won’t start can be frustrating and inconvenient, but it does not have to be a mystery.

By following the steps and tips in this article, you can narrow down the possible causes and solutions for your hybrid car’s starting problem.

Remember to always exercise caution and safety when working on your hybrid car, and consult a qualified hybrid technician if you are unsure or uncomfortable with any procedure.

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