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2020 RDX A-Spec Loss of Power and Check Engine Light - P0299

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Brian F. · rep 0 · May 22, 4:55 AM · 1 replies · solved · Question

Vehicle: 2020 Acura RDX A-Spec

Hello fellow Acura owners,

I'm having a frustrating issue with my 2020 Acura RDX A-Spec, which has about 45,000 miles on it. Periodically, I'll experience a sudden and significant loss of power while driving. It feels like the turbo isn't engaging at all, and the car struggles to accelerate.

Along with the power loss, the check engine light comes on. I managed to pull a code, and it's P0299, which points to 'Turbocharger/Supercharger Underboost.' Sometimes, after restarting the car, the light goes off, and power returns, but it always comes back eventually. Has anyone dealt with this on their RDX? What was the culprit?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:55 AM

0

ClearTheCode admin answer:

The P0299 code, indicating 'Turbocharger/Supercharger Underboost,' on your 2020 Acura RDX A-Spec is a common issue that points to a problem in the turbocharging system. Here are the most likely causes and recommended actions:

  1. Wastegate Actuator/Valve Issues: The most frequent cause for P0299 on these models is a faulty turbocharger wastegate actuator or the wastegate valve itself. If the wastegate is stuck open or not closing properly, it prevents the turbo from building adequate boost pressure.
  2. Boost Leaks: Check for leaks in the intake system, including hoses, intercooler, and connections. A crack in a charge pipe or a loose clamp can allow boost pressure to escape, leading to underboost conditions.
  3. Turbocharger Malfunction: While less common, the turbocharger itself could be failing, either due to internal damage or issues with the compressor or turbine wheels.
  4. MAP Sensor/MAF Sensor: A faulty Manifold Absolute Pressure (MAP) sensor or Mass Air Flow (MAF) sensor can provide incorrect readings to the engine control unit (ECU), leading to incorrect boost calculations and triggering the code.
  5. Clogged Catalytic Converter: Although less direct, a severely restricted exhaust (e.g., a clogged catalytic converter) can create excessive back pressure, hindering turbocharger performance.

When to see a shop:

  • Immediately if the check engine light is flashing or if you experience severe power loss that makes the vehicle unsafe to drive.
  • If you notice any unusual noises (whining, hissing) from the engine bay.
  • If the issue persists after checking basic connections. A professional diagnostic is crucial to pinpoint the exact cause, as specialized tools are often needed to test boost pressure and wastegate function. Ignoring this can lead to further engine damage or reduced fuel economy.
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