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2017 XC90 T6 Loss of Power and Limp Mode - Turbo Issue?

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Nicole W. · rep 0 · May 22, 5:11 AM · 1 replies · solved · Question

Vehicle: 2017 Volvo XC90 T6 Momentum

My 2017 Volvo XC90 T6 has been acting up lately. While driving on the highway, I suddenly experienced a significant loss of power, and the car went into what felt like 'limp mode.' The check engine light came on, and acceleration was severely limited.

I pulled over, turned the car off and on, and the power seemed to return temporarily, but the CEL stayed on. It's happened a couple of times now, especially under acceleration. It feels like the turbo isn't engaging or there's some sort of boost issue.

Has anyone else with a similar year XC90 experienced this? What could be causing this sudden power reduction? I'm worried about driving it like this.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:11 AM

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ClearTheCode admin answer:

Experiencing sudden power loss and limp mode in your 2017 XC90 T6 can be concerning, but it's a common symptom for several engine-related issues. The T6 engine, being supercharged and turbocharged, has a complex air induction system.

Potential Causes:

  • Turbocharger/Supercharger Malfunction: Issues with the wastegate, bypass valve, or the turbo/supercharger itself can lead to underboost conditions.
  • Boost Leak: A crack or loose connection in the intercooler piping or vacuum lines can cause a loss of boost pressure.
  • Faulty Sensors: The Manifold Absolute Pressure (MAP) sensor or Mass Air Flow (MAF) sensor can provide incorrect readings, leading the engine control unit (ECU) to limit power.
  • Electronic Throttle Body (ETB) Issues: A malfunctioning ETB can restrict airflow.
  • Clogged Catalytic Converter: While less common for sudden onset, a severely clogged cat can restrict exhaust flow and cause power loss.

Diagnostics & Next Steps:

  1. Retrieve OBD-II Codes: The most crucial first step is to get the exact diagnostic trouble codes (DTCs) from the check engine light. Common codes for this issue include P0299 (Turbocharger/Supercharger Underboost) or P0087 (Fuel Rail/System Pressure - Too Low).
  2. Inspect for Leaks: Visually check all visible intake and vacuum hoses for cracks, disconnections, or signs of wear.
  3. Listen for Unusual Noises: Pay attention to any whistling, hissing, or grinding sounds from the engine bay, especially during acceleration.
  4. Monitor Engine Parameters: If you have access to an OBD-II scanner with live data, monitor boost pressure, fuel pressure, and sensor readings.

When to See a Shop:

Given that your vehicle is entering limp mode, it's strongly recommended to have it professionally diagnosed as soon as possible. Driving in limp mode for extended periods can potentially cause further damage. A qualified Volvo technician will have specialized diagnostic tools to pinpoint the exact cause, whether it's a sensor, a boost leak, or a more significant turbo/supercharger component failure. They can also perform necessary software updates if applicable.

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