If you hear a loud screeching noise when starting your car, it’s usually caused by a slipping drive belt or an issue with the starter motor. This noise often happens on cold starts and may get worse with weather changes or increased electrical load. An inspection is needed to identify the cause and prevent further wear or failure.

What does it mean if you hear a screeching noise when starting the car?

A loud screeching or squealing noise usually means the serpentine belt is slipping on the pulleys. This may be due to belt wear, misalignment, or a failing tensioner. Less commonly, it can point to a starter motor problem or accessory pulley fault.

Common causes of screeching noises at startup

• Worn or loose serpentine/drive belt
• Failing belt tensioner or idler pulley
• Misaligned or seized accessory pulley (alternator, power steering, AC compressor)
• Moisture or oil contamination on the belt
• Starter motor engagement issue

Why do you need to fix this problem quickly?

If the drive belt fails, you could lose power steering, battery charging, or engine cooling. Ignoring the noise may also damage pulleys, bearings, or the starter motor.

How do you know when to get it checked?

You should book an inspection if:

• You hear screeching or squealing during startup
• The noise continues after starting or when revving the engine
• You notice dimming headlights or electrical issues
• The steering feels heavy or the AC isn’t working properly
• The battery light or other warning lights appear

What happens during an assessment?

A mechanic will:

1. Inspect the serpentine/drive belt for wear, cracks, or glazing
2. Check belt tension and adjust if necessary
3. Test pulleys, idler, and tensioner for smooth operation
4. Inspect the starter motor if the belt is not the cause
5. Replace worn components and test for proper operation

How much does it cost to fix?

Drive belt replacement typically costs $180–$400. If the tensioner or pulleys also need replacement, the repair may cost $350–$800+. Starter motor repairs can cost $580–$1,000+.

Is it unsafe to drive with this problem?

Yes. A slipping or failing belt can lead to sudden loss of power steering, battery charging, or cooling system function. It should be repaired immediately to avoid a breakdown.