The ignition switch is a major component of your vehicle. It is most commonly found in many trucks and cars. The ignition coil is typically located just behind the ignition lock cylinder on the steering column. When you insert the ignition key into the ignition switch and turn it, your vehicle engine starts. This article mainly explains the bad ignition switch causes, symptoms, and replacement cost.
What is the Ignition Switch?
The ignition switch is an assembly that contains the ignition lock cylinder. The ignition switch has the responsibility of starting the car and powering certain parts of the car, such as the electronic parts, ignition, and engine.
Because the ignition switch delivers the electrical power to the vehicle’s electrical accessories, it is important to keep it in good working order throughout the life of the vehicle.
What does an ignition switch do?
The ignition switch of your vehicle is very important to keep it moving. It plays a crucial role in booting up the car’s main electrical system. If the ignition system does not work, the car may not start, or the power or radio windows may not work.
Like most car switches, a key is used to operate the ignition switch. You can start your car by putting and turning the key in the ignition switch. However, the latest car models have an ignition button instead of a key.
Symptoms Of a Bad Ignition Switch
As the ignition switch goes bad, it produces one of the below-given symptoms:
- Car Engine Won’t Start
- Ignition is constantly turned On
- Car stalls while driving
- Stuck steering wheel
- Hard to turn the key
- Silent starter motor
- Car starts and then suddenly stalls
- Issues powering on the accessories
- Check engine light illumination
1) Car Engine Won’t Start
The main function of the ignition switch is to help to start the vehicle. If your ignition switch goes bad, your vehicle engine won’t start. A faulty ignition switch will not properly supply power to the ignition system, starter motor, and other engine controls, causing the engine not to start.
However, many other electrical and mechanical issues (i.e., a dead battery) may also stop the vehicle engine from starting. In fact, it is recommended to contact a mechanic for the proper diagnosis.
2) Car Stalls
If your vehicle engine stalls suddenly while driving, it is one of the common symptoms of a bad ignition switch.
When the ignition switch goes bad while the engine is running, power to the ignition system and fuel system will be lost, which may lead to the engine stalling. Depending on the specific problem, your car may or may not restart after a short time.
Read More: Why Car Engine Stall?
3) Hard to turn the key
Modern vehicle models use an ignition button instead of an ignition key. If your car is still using a key and it does not turn smoothly whenever you try to start the vehicle, it means that there is something wrong. In such conditions, your ignition key may also get stuck in the keyhole. This symptom indicates that your ignition switch is badly damaged and needs to be repaired or fixed quickly.
This is a common issue with a key whose blades are more of a cylindrical design. The groves and notches gradually rounded and smoothed out over time. This stops the key from rotating the different pins in the barrel according to the correct positions.
Read More: How to remove stuck ignition key?
4) Car starts and then suddenly stalls
If your car starts and then unexpectedly stalls, it is one of the clear signsof a bad ignition switch. When the ignition switch is in the start position, it immediately takes power from the vehicle battery and turns on the ignition system and fuel pump. This allows your car to be started.
However, if your switch fails in the “on” position, it will not deliver power to the fuel pump and ignition system as soon as you pull the key from the start position to the “on” position.
5) Issues powering on the accessories
A faulty ignition switch doesn’t properly supply power to the electrical accessories of your vehicle. Inserting the key and turning it to the “acc” position activates the ignition switch and turns on the vehicle’s electrical parts, like the center console, dashboard, and interior lights.
If your vehicle’s accessories don’t get power as you insert and turn the key, it means that your ignition switch is faulty. Similar symptoms can also be produced by fuse or wiring issues. Therefore, in such a condition, you should properly diagnose the issue.
6) Ignition is constantly turned On
There may be an issue with your ignition switch if you shut off your car, but surprisingly the car keeps running even with the ignition off and the key removed.
It’s not very common, but it happens. Once the immobilizer is unlocked, the key does not need to be detected again until it is reset, allowing you to drive without a key.
7) Silent Starter Motor
A quiet starter is one of the major symptoms of a faulty ignition switch. In such a case, put the transmission in neutral and recheck to see if the neutral safety switch is the problem. If you hear any clicking sound from the motor, there may be something other than an ignition switch problem.
8) Stuck Steering Wheel
The ignition lock has a mechanical lock for the steering wheel. This lock protects your vehicle by stopping the steering wheel when parking. If your vehicle has an issue with the steering lock, it means that the ignition cylinder needs to be checked for service.
9) Check Engine Light
When the vehicle’s computer monitors an issue with the ignition switch, it usually turns on the check engine light to alert the driver. This light is usually located on the vehicle dashboard.
Read More: Causes of Check Engine Light Flashing
Causes of a Bad Ignition Switch
Your ignition switch may go bad due to one or more of the following causes:
- Stuck ignition key inside the ignition
- Bad wafers
- The transponder doesn’t communicate with PCM
- Manufacturer Fault
- Damaged ignition key
1) Broken-off Key is Stuck Inside the Ignition Switch
The broken key in the ignition lock is one of the major causes of a bad ignition switch. Your key wears out with time, weakening and ultimately breaking into the ignition switch.
2) Bad Wafers
A wafer is a unique set of cuts in each ignition lock that allows you to identify the unique key for that car.
Your vehicle’s wafers may clog up with dirt and grime from daily wear and tear. If they are worn out and no longer respond to key insertion, the key cleaning can repair individually worn wafers or replace the complete switch.
3) Transponder doesn’t Communicate with PCM
If your vehicle has problems with the security system or the key fault light on your dashboard indicates an issue, there is a high chance that your PCM chip is faulty or it needs reprogramming. In such a case, you will need to reprogram or copy the original key to create a new key.
4) Manufacturer Fault
In some cases, a faulty ignition switch can cause an entire problem. If your vehicle is still under warranty, most vehicle manufacturers will replace it for free if it is defective.
5) Faulty Key
Your vehicle key wears out with the passage of time. In such conditions, unique grooves on each key become worn, which may cause the ignition to not respond. Try a spare key to make sure it is the key and not a faulty ignition switch. If everything is ok, you need to change the key.
How to start a car with a bad ignition switch?
Follow one of the below-given methods to start your car with a bad ignition switch:
- Hotwiring method
- The drill and screwdriver method
- Jumper cables method
1) Hotwiring
If your vehicle is manufactured before the mid-1990s, this method is best to start a vehicle with a bad ignition switch.
- First of all, locate the steering column.
- Remove the plastic cover that holds all the inner components in place. This will show you all the parts you will need.
- Now find the wiring harness connector. There are many cables and wires in this area, so finding a specific connector can be difficult. But mostly, it’s in the middle of the steering column. Other connectors, cables, and wires are connected to the light control wipers and other parts.
- Next, you need to find the connections for the starter motor, ignition, and battery.
- The brown and yellow wires refer to the ignition switch. The red wire refers to the battery.
- Strip the battery cables 1 inch below the insulation and twist them together.
- Connect the ignition switch wires to the battery wires, and your vehicle’s lights will come on, and the electrical components will start working.
- To start the engine, strip the starter motor cable 0.5 inch and connect it with the linked battery cable.
- The engine should now start. So, let’s start the engine for a while.
2) The drill and screwdriver
This method can also work but be careful as it may completely damage your ignition switch. Follow the below-given steps to start your car with a faulty ignition switch.
- Find the keyhole
- Use a metal drill to drill out the keyhole according to the length of the key. This process can damage the ignition cylinder’s inner pin.
- Take a screwdriver, insert it in the keyhole like the key, and turn on the ignition. In this way, your car will start.
3) Jumper Cables
- First of all, open the hood
- Locate the battery and ignition coil.
- Use a jumper cable to link the positive side of the battery to the coil’s positive side. This will supply power to the circuit board, which is required to start the engine.
- Find the starter solenoid and connect the solenoid to the battery-positive terminal. Next, disconnect the ignition switch harness from the solenoid.
- Use a screwdriver to short the positive pole of the solenoid to the terminal where the ignition switch is mounted.
- This activates the solenoid and starts the car.
Ignition Switch Replacement Cost
The replacement cost of the ignition switch varies according to the vehicle model, labor cost, and the type of brand. The average replacement cost of the ignition switch is from $110 to $260. An ignition switch costs from $30 to $70, while labor costs $80 to $190.
Ignition Switch Location
The ignition switch of the car is typically located on the back of the ignition lock cylinder where you insert the key.
To locate the ignition switch:
- Remove all the covers around the steering wheel
- Disassemble the whole ignition lock cylinder
- In a few cars, you can remove the ignition switch from the ignition barrel – but sometimes, it is an integrated part.
FAQ Section
Can a bad ignition switch cause electrical problems?
The ignition switch of your vehicle has the responsibility to ensure the proper supply of power from the battery to different electrical accessories of the vehicle, such as the ignition system, lighting, fuel system, and other accessories. A faulty ignition switch won’t be able to deliver power to the ignition system, starter motor, and other engine controls, preventing the engine from starting.
What are the signs of a bad ignition switch Chevy?
- Check engine light illumination
- Car engine won’t start
- Ignition is constantly turned on
- Car stalls while driving
- Stuck steering wheel
- Hard to turn the key
- Silent starter motor
- Car starts and then suddenly stalls
- Issues powering on the accessories
How to fix a bad ignition switch?
- Collect the necessary tools
- Remove the negative terminal of the battery
- Gently detach the steering column covers by removing the screws or fasteners
- Remove other components such as the airbag, and steering wheel to easily remove the ignition switch
- Find the ignition switch
- Gently remove the old switch by unscrewing the mounting screws or bolts
- Install the new ignition switch
- Reinstall all the parts back on their original place
- Reconnect the battery and perform a test drive
Can a bad ignition switch cause rough idle?
Yes, a bad ignition switch may cause the rough idle. When the ignition switch doesn’t properly supply power to the fuel system, ignition system, or other engine parts, it may lead to poor air-fuel mixture, leading to rough idling
