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2022 S60 B5 Engine Light & Rough Idle - PCV Valve?

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Heather Y. · rep 0 · May 22, 5:19 AM · 1 replies · solved · Question

Vehicle: 2022 Volvo S60 B5 Momentum

Hey everyone, I'm having an issue with my 2022 Volvo S60 B5 Momentum. The check engine light came on yesterday, and since then, the car has developed a noticeable rough idle. It feels a bit shaky when stopped, and sometimes there's a slight hesitation when accelerating from a standstill.

I've heard that a failing PCV (Positive Crankcase Ventilation) valve can cause these kinds of symptoms, especially with the newer B5 engines. The car only has about 35,000 miles on it, so I'm a bit surprised to see an engine light already.

Could this really be the PCV valve, or are there other common issues I should be looking into? Is this something I can check myself, or should I just take it straight to the dealer?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:19 AM

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ClearTheCode admin answer:

A check engine light combined with a rough idle on your 2022 Volvo S60 B5 Momentum at 35,000 miles certainly points towards an engine management issue, and a failing PCV system is a very plausible culprit.

Here's a breakdown of what might be happening:

  1. PCV System Function:

    • The PCV system is crucial for venting crankcase gases, preventing pressure buildup, and recirculating unburnt fuel vapors back into the engine to be burned.
    • A failing PCV valve or a clogged PCV system can lead to vacuum leaks, excessive crankcase pressure, or oil consumption, all of which can cause rough idling and engine performance issues.

  2. Common Symptoms of PCV Failure:

    • Rough Idle/Misfires: Due to incorrect air-fuel mixture caused by vacuum leaks.
    • Check Engine Light: Often triggered by lean conditions.
    • Whistling/Hissing Noises: Can indicate a vacuum leak from a cracked PCV diaphragm.
    • Increased Oil Consumption: Due to pressure issues.
    • Oil Leaks: Excessive crankcase pressure can force oil past seals.

  3. Relevant OBD Codes:

    • If you can get the codes read, look for:
      • P0171 / P0174: System Too Lean (Bank 1/Bank 2) – These are very common with PCV vacuum leaks.
      • P030X: Misfire Detected (where X is the cylinder number) – Can be a secondary symptom.
      • Other codes related to vacuum leaks or engine performance.

  4. Diagnosis and Action:

    • Visual Inspection: Check for any obvious cracks or disconnected hoses around the PCV system components. On some Volvo engines, the PCV diaphragm is integrated into the valve cover, which can crack.
    • Smoke Test: A professional shop can perform a smoke test to easily identify vacuum leaks.
    • Professional Help: Given the car's age and the potential complexity of diagnosing and replacing PCV components on modern Volvo engines (which often involve integrated systems), it's highly recommended to have a qualified Volvo technician diagnose this. They have the specialized diagnostic tools to pinpoint the exact cause and ensure proper repair. Ignoring these symptoms can lead to further engine damage or reduced fuel economy.
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