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2019 V60 T5 "Reduced Engine Performance" Warning

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Jason D. · rep 0 · May 22, 5:10 AM · 1 replies · solved · Question

Vehicle: 2019 Volvo V60 T5 Cross Country

I'm getting a persistent "Reduced Engine Performance" message on the dashboard of my 2019 Volvo V60 T5 Cross Country. It comes on intermittently, usually when I'm accelerating or going uphill, and the car definitely feels like it loses power. It's not a full limp mode, but it's noticeable.

Sometimes, the Check Engine Light also comes on with it, but then it goes off after a few drive cycles. I've tried pulling codes when the CEL is on, and I've seen P0299 (Turbocharger/Supercharger Underboost) and sometimes P0171 (System Too Lean Bank 1).

What could be causing these issues? Is it a turbo problem, or something else entirely? I'm worried about driving it like this.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:10 AM

0

ClearTheCode admin answer:

The "Reduced Engine Performance" message combined with P0299 (Underboost) and P0171 (System Too Lean) on your 2019 Volvo V60 T5 Cross Country strongly suggests an issue affecting the engine's ability to maintain proper air-fuel mixture and boost pressure. These codes are often interconnected.

Possible Causes:

  1. Boost Leaks: The most common cause for P0299. Leaks in the intercooler piping, charge pipe, or vacuum lines related to the turbocharger can lead to a loss of boost pressure.
  2. Faulty Wastegate/Bypass Valve: A malfunctioning turbo wastegate or bypass valve can prevent the turbo from building adequate boost.
  3. Mass Air Flow (MAF) Sensor: A dirty or failing MAF sensor can provide incorrect air intake readings, leading to both lean conditions and incorrect boost calculations.
  4. Oxygen Sensor: A faulty O2 sensor can incorrectly report a lean condition (P0171).
  5. PCV System Issues: A failing PCV valve or system can create vacuum leaks, leading to lean conditions and potentially affecting boost control.
  6. Fuel Delivery Issues: Clogged fuel injectors or a weak fuel pump could cause a lean condition, especially under load.

Troubleshooting Steps:

  1. Inspect Boost Hoses: Carefully check all visible turbocharger and intercooler hoses for cracks, loose clamps, or tears.
  2. Clean MAF Sensor: Use a dedicated MAF sensor cleaner to clean the sensor element.
  3. Listen for Hissing: With the engine running, listen for any hissing sounds that might indicate a vacuum or boost leak.

When to See a Shop:

  • If visual inspection and MAF cleaning don't resolve the issue.
  • If the "Reduced Engine Performance" message becomes more frequent or severe.
  • Diagnosing boost leaks often requires a smoke test, which a professional shop can perform. They can also check live data for boost pressure, fuel trims, and O2 sensor readings to pinpoint the exact cause. Given the combination of codes, a comprehensive diagnostic is recommended to prevent potential engine damage.
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