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Check Engine Light and Whistling Noise on 2018 XC60 T5

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Ryan M. · rep 0 · May 22, 5:20 AM · 1 replies · solved · Question

Vehicle: 2018 Volvo XC60 T5 Momentum

Hey everyone,

I've been experiencing a persistent check engine light on my 2018 Volvo XC60 T5 Momentum. It's got about 75,000 miles on it. Lately, I've also noticed a distinct whistling sound coming from the engine bay, especially when the engine is warm and at idle.

I've checked the oil level, and it seems to be consuming more oil than usual between changes. The car drives fine for the most part, but the CEL is concerning. I'm wondering if this is a common issue with the T5 Drive-E engines in this model year range?

Has anyone else dealt with this? What was the fix? I'm trying to figure out if this is something I can troubleshoot myself or if it's definitely a dealer visit. Any advice would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:20 AM

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ClearTheCode admin answer:

It sounds like you're describing a very common issue with the Volvo Drive-E engines, particularly the T5, related to the Positive Crankcase Ventilation (PCV) system. This is a frequent concern for owners of 2016-2020 models.

  1. Understanding the PCV System: The PCV system is crucial for removing blow-by gases from the crankcase, preventing pressure buildup, and recirculating them back into the engine to be burned. A common failure point is the PCV diaphragm, often integrated into the oil trap or valve cover.

  2. Common Symptoms and Causes:

    • Whistling Noise: This is a classic indicator of a failed PCV diaphragm. When the diaphragm tears, it creates a vacuum leak, causing air to be sucked in, resulting in a high-pitched whistle.
    • Increased Oil Consumption: A faulty PCV system can lead to excessive vacuum in the crankcase, drawing oil vapor into the intake manifold, where it's burned, increasing oil consumption.
    • Check Engine Light (CEL): The vacuum leak caused by a failing PCV can lead to the engine running lean. Common OBD-II codes associated with this include P0171 (System Too Lean Bank 1) and sometimes P0174 (System Too Lean Bank 2, if applicable), or even misfire codes if the vacuum leak is severe enough to disrupt combustion. You might also see codes related to engine vacuum or idle control.
    • Rough Idle or Stalling: In severe cases, the vacuum leak can cause an unstable idle.

  3. Diagnosis and Repair:

    • A simple test is to try removing the oil filler cap while the engine is running. If there's significant suction, it strongly suggests a PCV issue.
    • A professional shop will often perform a smoke test to pinpoint the exact location of the vacuum leak.
    • The repair typically involves replacing the entire PCV oil trap assembly, which often includes the diaphragm and is sometimes integrated with the valve cover on these engines. This is a critical maintenance item for engine longevity.

  4. When to See a Shop:

    • Given the persistent CEL, whistling noise, and increased oil consumption, it's highly recommended to have your 2018 XC60 T5 inspected by a qualified Volvo technician or a reputable independent shop specializing in European cars as soon as possible.
    • Ignoring a PCV issue can lead to further engine damage, including oil leaks, premature wear, and potentially catalytic converter damage due to excessive oil burning.
    • While some DIYers might attempt this, the repair can be complex, requiring specific tools and knowledge to ensure proper sealing and prevent further issues. Check if your vehicle falls under any extended warranty or TSBs related to PCV systems, as Volvo has addressed these issues in some cases.
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