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2018 S60 T5 Rough Idle and Check Engine Light - P0301

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Chris P. · rep 0 · May 22, 5:13 AM · 1 replies · solved · Question

Vehicle: 2018 Volvo S60 T5

Hey everyone,

I'm having an issue with my 2018 Volvo S60 T5, the 2.0L turbocharged model. Lately, I've noticed a really rough idle, especially when the car is cold or at a stoplight. It feels like the engine is shaking more than usual.

Yesterday, the check engine light came on, and I pulled the code using my OBD-II scanner. It's showing P0301, which indicates a misfire in Cylinder 1. The car still drives, but it feels a bit sluggish, and the rough idle is definitely concerning.

Has anyone experienced this with their S60 T5? What were the common culprits? I'm hoping it's something relatively simple like a spark plug or coil, but I'm open to any advice before I take it to the shop. Thanks in advance!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:13 AM

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ClearTheCode admin answer:

The P0301 diagnostic trouble code indicates that your vehicle's engine control module (ECM) has detected a misfire in Cylinder 1. This is a common issue that can stem from several sources within the engine's combustion system. Addressing it promptly is important to prevent potential damage to other components, such as the catalytic converter.

Here are the common causes for a P0301 code on your 2018 Volvo S60 T5:

  • Faulty Spark Plug: The spark plug in Cylinder 1 might be worn, fouled, or damaged, preventing a proper spark.
  • Defective Ignition Coil: The ignition coil responsible for Cylinder 1 could be failing, leading to an insufficient spark.
  • Clogged or Faulty Fuel Injector: If the fuel injector for Cylinder 1 isn't delivering the correct amount of fuel, it can cause a lean or rich condition leading to a misfire.
  • Vacuum Leak: A vacuum leak near Cylinder 1 can introduce unmetered air, disrupting the air-fuel mixture.
  • Low Compression: Less common, but low compression in Cylinder 1 due to internal engine wear or damage can cause misfires.
  • Wiring Issues: Damaged wiring to the spark plug, ignition coil, or fuel injector for Cylinder 1.

Diagnostic Steps You Can Take:

  1. Inspect Spark Plug and Ignition Coil: Carefully remove the ignition coil and spark plug from Cylinder 1. Look for signs of wear, carbon buildup, or damage. If you're comfortable, you can try swapping the Cylinder 1 coil and plug with an adjacent cylinder (e.g., Cylinder 2) to see if the misfire code moves to the new cylinder. If it does, you've likely identified the faulty component.
  2. Check for Vacuum Leaks: Listen for hissing sounds around the intake manifold and vacuum lines. A can of unlit propane or a smoke machine can help pinpoint leaks.
  3. Fuel System Check: While more advanced, a fuel pressure test or checking fuel injector resistance can help rule out fuel delivery issues.

When to See a Shop:

If the basic checks (like swapping coils/plugs) don't resolve the issue, or if you're uncomfortable performing these diagnostics yourself, it's best to take your Volvo to a qualified mechanic. They have specialized tools to perform more in-depth diagnostics, such as compression tests, fuel injector flow tests, and advanced electrical checks, to accurately pinpoint the root cause of the misfire and ensure your engine is running optimally.

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