A grinding noise near one of your wheels can come from several different problems. Common causes include worn brake pads, a damaged brake rotor, a failing wheel bearing, a bent brake dust shield, or debris caught between moving components.

The sound may change when you brake, turn, or increase your speed, which can help identify where it is coming from. Because wheel and brake problems can affect your ability to control or stop the vehicle, persistent grinding should be inspected as soon as possible. Avoid driving the vehicle if the grinding is severe, the steering feels loose, the vehicle pulls to one side, or you feel strong vibration.

Grinding while braking often means the brake pads have worn down far enough that metal is contacting the brake rotors. Continuing to drive can damage the rotors and calipers, increase the cost of the repair, and reduce braking performance.

Light grinding during the first few stops after the vehicle has been parked—especially after rain, snow, or a damp night—may be caused by temporary surface rust. However, grinding that continues, becomes louder, or is accompanied by vibration, pulling, a soft brake pedal, or a brake warning light needs immediate attention. Schedule a brake inspection rather than waiting for the noise to get worse.

A squealing noise when the engine first starts is commonly caused by a slipping serpentine belt. The belt may be worn, loose, glazed, contaminated by oil or coolant, or affected by a weak belt tensioner. A worn pulley or accessory bearing can produce a similar sound.

The squeal may only last a few seconds or become louder when you turn on the air conditioning, use the power steering, or accelerate. Even if the noise disappears after the engine warms up, the belt and pulleys should be inspected. A failed serpentine belt can disable important systems such as the alternator, water pump, or power steering.

Cold weather can make existing belt and brake problems more noticeable. Rubber belts become stiffer in low temperatures and may briefly slip during startup. Moisture or light surface rust can also form on the brake rotors overnight, causing the brakes to squeak during the first few stops. Cold weather also places additional strain on the battery and starting system.

A brief noise that disappears may not indicate an emergency, but frequent, loud, or worsening squealing should be inspected. Pay attention to whether the sound comes from under the hood or from the wheels, and whether it happens during startup, braking, turning, or acceleration.

A car may fail to start because of a weak or dead battery, corroded battery connections, a faulty starter, charging-system problems, an ignition issue, or a fuel-delivery problem. The sounds the vehicle makes can help narrow down the cause.

Rapid clicking or slow cranking commonly points to a weak battery or poor electrical connection. One solid click may indicate a starter problem. If the engine turns over normally but does not start, it may not be receiving the correct amount of fuel or spark. A diagnostic inspection can identify the actual failure instead of replacing parts based on guesswork.

An engine that chugs, shakes, sputters, or runs roughly after starting may be misfiring. Possible causes include worn spark plugs, failing ignition coils, a dirty mass airflow sensor, a vacuum leak, restricted fuel delivery, contaminated fuel, or another air-and-fuel mixture problem.

The problem may be more noticeable during a cold start and then improve as the engine warms up. However, repeated rough starts should not be ignored. If the check-engine light is flashing, stop driving and have the vehicle inspected promptly. A flashing light can indicate a severe misfire that may damage the catalytic converter.

When there is no crank, no clicking, and little or no response from the vehicle, the problem is often electrical. Possible causes include a dead battery, loose or corroded battery terminals, a failed starter or starter relay, a faulty ignition switch, or a problem with the park/neutral safety switch. Push-button vehicles may also fail to respond when the key-fob battery is dead or the vehicle does not recognize the key.

Make sure the transmission is fully in Park and try starting the vehicle in Neutral. Push the brake or clutch pedal firmly and check the dashboard for a “key not detected” message. If the lights are dim or completely off, the battery or its connections are a likely starting point. If the lights work normally but the engine does nothing, the starter circuit should be professionally tested.