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2017 XC60 T5 Loss of Power and Whistling Noise - Turbo Problem?

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Mike T. · rep 0 · May 25, 3:53 AM · 1 replies · solved · Question

Vehicle: 2017 Volvo XC60 T5

Hey everyone,

I've got a 2017 Volvo XC60 T5 with about 85,000 miles on it, and I've started experiencing a significant loss of power, especially when accelerating. It feels like the turbo isn't kicking in at all. On top of that, there's a distinct whistling sound coming from the engine bay, which gets louder under load.

The check engine light came on a few days ago. I had a quick scan done, and it pulled a P0299 code, which points to an 'Engine Underboost' condition. I'm worried it might be something serious with the turbocharger itself or a related component.

Has anyone else with a similar model year XC60 experienced this? What was the culprit in your case? Any advice on what to check first before taking it to the dealership?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:53 AM

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ClearTheCode admin answer:

It sounds like you're definitely on the right track with suspecting a turbo-related issue, especially with the P0299 code and symptoms you've described. An 'Engine Underboost' condition means the engine's actual boost pressure is lower than the desired boost pressure.

Here are the common causes and steps to consider:

  1. Inspect for Boost Leaks: This is the most frequent cause of P0299. Look for cracks, loose clamps, or disconnected hoses in the intake system, particularly between the turbocharger and the engine. A whistling sound often indicates air escaping under pressure.
  2. Check the Wastegate Actuator and Linkage: The wastegate controls exhaust gas flow to the turbine. If the actuator or its linkage is faulty, stuck open, or has a vacuum leak, the turbo won't build proper boost. A visual inspection might reveal issues.
  3. Examine the Turbocharger Itself: While less common for a 2017 model unless abused, the turbocharger's impeller could be damaged, or the bearings could be failing. This would often be accompanied by excessive smoke from the exhaust or oil consumption.
  4. Inspect the Boost Pressure Sensor (MAP Sensor): A faulty MAP sensor can send incorrect readings to the Engine Control Module (ECM), leading to incorrect boost management.
  5. Check the Charge Air Cooler (Intercooler): A leak in the intercooler can also lead to boost loss.

When to See a Shop:

  • Immediately: If the whistling sound becomes very loud, or if you notice any smoke from the exhaust, or significant loss of oil. Continued driving with severe turbo issues can cause further engine damage.
  • Soon: If you're unable to visually identify a boost leak or if the wastegate appears functional. Diagnosing boost issues often requires specialized tools like a smoke machine for leak detection and a diagnostic scanner to monitor live boost pressure data. A qualified Volvo technician can accurately pinpoint the source of the underboost condition and perform necessary repairs or replacements.
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