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Loud Squealing Noise from Engine Bay on 2017 Regal Sportback

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David L. · rep 0 · May 25, 2:47 AM · 1 replies · solved · Question

Vehicle: 2017 Buick Regal Sportback Essence

Hello Buick forum,

I'm experiencing a really annoying and loud squealing noise coming from the engine bay of my 2017 Buick Regal Sportback (2.0T engine). It's most noticeable right after a cold start, especially in the morning, and sometimes when I turn the steering wheel sharply.

The noise usually lasts for a few minutes and then either fades away or becomes less prominent as the engine warms up. It's definitely coming from the belt area, but I can't tell if it's the serpentine belt itself or one of the pulleys.

My car has about 60,000 miles on it. Is this a common sign that the serpentine belt needs replacing, or could it be something else entirely? Any tips on how to diagnose this further before I take it in?

Thanks for your insights!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:47 AM

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ClearTheCode admin answer:

The loud squealing noise you're hearing from your 2017 Buick Regal Sportback's engine bay, especially on cold starts and with steering input, is a classic symptom of a worn or loose serpentine belt, or a failing accessory pulley. With 60,000 miles, it's definitely a prime candidate for inspection or replacement.

Here’s how to diagnose and address it:

  1. Visual Inspection of the Belt:
    • With the engine off and cool, carefully inspect the serpentine belt. Look for cracks, fraying, glazing (shiny spots), or missing ribs.
    • Check the tensioner. It should provide adequate tension. If it appears loose or wobbles excessively, it might be failing.
  2. Check Pulleys:
    • While the engine is off, manually spin each accessible pulley (alternator, power steering pump, AC compressor, idler pulley, tensioner pulley). Listen for grinding, squeaking, or roughness. Also, check for any excessive play or wobble.
    • A common trick is to briefly spray a small amount of water on the ribbed side of the belt while the engine is running and squealing. If the noise temporarily stops, it's almost certainly the belt. If it continues, it points more towards a pulley.
  3. Accessory Drive System: The fact that turning the steering wheel makes it worse suggests the power steering pump (if hydraulic) or its pulley might be involved, or simply that the increased load on the belt system exacerbates the issue.

Common Causes:

  • Worn Serpentine Belt: Over time, the rubber hardens, cracks, and loses its grip, leading to slippage and squealing.
  • Failing Tensioner: A weak or seized tensioner can't maintain proper belt tension, causing slippage.
  • Bad Idler or Accessory Pulley Bearings: Worn bearings in any of the pulleys (alternator, AC compressor, power steering, idler) can cause squealing or grinding.

When to See a Shop:

  • If you're unsure about diagnosis or replacement: Replacing a serpentine belt can be straightforward, but ensuring proper routing and tension is critical. Some pulleys require special tools.
  • If the noise persists after belt replacement: This strongly indicates a failing accessory component (e.g., alternator bearing, AC compressor clutch bearing, power steering pump).
  • If you notice any other unusual noises or performance issues: These could be signs of a more complex problem requiring professional attention.

Addressing this is important as a broken serpentine belt can lead to loss of power steering, charging system failure, and overheating.

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