What is a starter solenoid?
A car starter solenoid receives electrical signals when you turn your key in the ignition or press the start button. When it receives electrical signals, it pulls a lever that moves the starter motor’s pinion gear, and the engine’s flywheel or flexplate engages. The starter motor then spins the engine’s crankshaft to start the combustion process, which runs your vehicle after the solenoid disengages.
When should I replace the starter solenoid on my car?
If you notice any of the following signs, it may be time to replace your starter solenoid:
Difficulty starting: If you turn your ignition key or press your vehicle’s start button and your car doesn’t turn on or the engine struggles with cranking, there may be an issue with your starter solenoid. Starter failure can occur intermittently and tends to happen when the vehicle is hot or recently driven.
Clicking sound: If you hear a consistent clicking sound, whirring, or other unusual noises when you try to start your car, it may signal an issue with your starter motor’s gear due to a bad solenoid.
Starter remains engaged: Your starter solenoid is meant to disengage once your crankshaft starts the combustion process. If your solenoid remains engaged, your starter motor will continue to run and you may hear a grinding noise from the flywheel or flexplate. A consistently engaged starter is not good for your vehicle and must be fixed as soon as possible.
Electrical issues: Your vehicle may suffer from electrical issues, like dim interior or exterior lights, due to a bad starter solenoid.
Burning smell or smoke: If your starter solenoid is severely failing, it may create smoke or a burning smell from your vehicle’s starter location.
How often should a starter solenoid be replaced?
Manufacturers do not recommend replacement intervals for starter solenoids. In some cases, a starter solenoid can last the entire lifetime of a vehicle.
To ensure your starter solenoid is in good condition, you should periodically inspect your vehicle and watch out for signs of a bad starter. Your starter motor and starter solenoid are typically serviced together, so if there’s an issue with one, the other will be inspected as well.
Can I replace my starter solenoid myself?
An engine starter solenoid replacement requires a fair understanding of your vehicle’s internal components, and it will take time. While you can perform this DIY car repair on your own, it's best to take your vehicle to a qualified mechanic for a correct starter solenoid replacement.