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2018 XC60 T5 Loss of Power and Whistling Noise - Check Engine Light On

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Rachel A. · rep 0 · May 22, 5:11 AM · 1 replies · solved · Question

Vehicle: 2018 Volvo XC60 T5 Momentum

Hey everyone,

I've been having a frustrating issue with my 2018 Volvo XC60 T5 Momentum lately. Over the past few weeks, I've noticed a significant loss of power, especially when accelerating onto the highway. It feels sluggish and just doesn't have the usual pep.

To make things worse, there's a distinct whistling sound coming from the engine bay, particularly under acceleration. And of course, the check engine light came on a few days ago. I'm worried it might be something serious with the turbo. Has anyone experienced this with their T5 engine?

Any advice on what this could be or what I should check first would be greatly appreciated before I take it to the dealer.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:11 AM

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ClearTheCode admin answer:

It sounds like your 2018 Volvo XC60 T5 is exhibiting classic symptoms of a turbocharger issue, specifically underboost. The whistling noise, loss of power, and check engine light are strong indicators.

Common Causes & Diagnostics:

  1. Turbocharger Wastegate Actuator Failure: This is a very common point of failure. The actuator can stick or fail to regulate boost pressure correctly. This often triggers a P0299 code.
  2. Boost Leak: A crack in an intercooler hose, charge pipe, or a loose clamp can cause boost pressure to escape, leading to reduced power and a whistling sound. A smoke test can help pinpoint these leaks.
  3. Faulty Turbocharger: While less common, the turbo itself could be failing, with worn bearings or damaged compressor/turbine wheels. This would typically present with more severe symptoms, possibly including blue smoke from the exhaust.
  4. Clogged Catalytic Converter: Though less likely to cause a whistling sound, a restricted exhaust can lead to power loss and trigger engine codes.

What to Do:

  1. Scan for Codes: Use an OBD-II scanner to retrieve the specific diagnostic trouble codes (DTCs). A common code for this issue is P0299 (Turbocharger/Supercharger Underboost Condition).
  2. Visual Inspection: Check all visible turbocharger hoses and connections for cracks, loose clamps, or signs of oil residue.
  3. Listen Carefully: Try to pinpoint the source of the whistling sound. Is it constant or only under boost?

When to See a Shop:

Given the symptoms and potential for turbocharger damage, it's highly recommended to have your Volvo inspected by a qualified technician as soon as possible. Continuing to drive with a significant underboost condition can lead to further engine damage or reduced fuel efficiency. A Volvo specialist will have the diagnostic tools to accurately identify the root cause, whether it's a simple hose replacement, an actuator repair, or a more involved turbocharger service.

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