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2019 RDX 2.0T - Loss of Power and P0299 Underboost Code

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Mike T. · rep 0 · May 25, 3:40 AM · 1 replies · solved · Question

Vehicle: 2019 Acura RDX A-Spec

Hello fellow Acura owners,

I'm having a persistent issue with my 2019 Acura RDX 2.0T with around 60,000 miles. The car occasionally feels sluggish, like it's lost a lot of its turbo boost, especially when accelerating from a stop or trying to pass on the highway. It's not constant, but it's happening more frequently.

Recently, the Check Engine Light came on, and when I scanned it, I got a P0299 code, which indicates 'Turbocharger/Supercharger Underboost'. I've heard of wastegate issues or vacuum leaks on other turbo engines. Is this a common problem for the 2.0T in the RDX? What should I be looking for?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:40 AM

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ClearTheCode admin answer:

The P0299 code ('Turbocharger/Supercharger Underboost Condition') on your 2019 Acura RDX 2.0T is a clear indicator that the engine's requested boost pressure isn't being met by the turbocharger system. This is a relatively common issue across many turbocharged vehicles, and the 2.0T engine in the RDX can experience it.

Common Causes for P0299 on the 2.0T:

  1. Wastegate Actuator/Linkage Issues: The wastegate controls exhaust flow to the turbo. If the actuator or its linkage is sticking, loose, or failing, it won't regulate boost pressure correctly.
  2. Vacuum Leaks: Leaks in the vacuum lines or boost pipes leading to or from the turbocharger, intercooler, or intake manifold can cause a loss of pressure.
  3. Turbocharger Failure: While less common at 60,000 miles without other symptoms (like smoke or excessive noise), internal turbocharger damage (e.g., worn bearings, damaged compressor/turbine wheels) could lead to underboost.
  4. Boost Pressure Sensor Failure: A faulty boost pressure sensor could be sending incorrect readings to the ECU, causing it to incorrectly detect an underboost condition.
  5. Clogged Catalytic Converter: A severely restricted exhaust system (e.g., a failing catalytic converter) can impede exhaust flow to the turbo, preventing it from spooling up correctly.

Recommended Diagnostic Steps:

  1. Visual Inspection: Carefully inspect all vacuum lines, boost pipes, and the intercooler for any cracks, loose connections, or signs of leaks. Pay close attention to the wastegate linkage on the turbocharger itself.
  2. Wastegate Actuator Test: If accessible, manually check the wastegate linkage for free movement. A professional can use a vacuum pump to test the actuator's function.
  3. Scan Tool Data: A professional scan tool can monitor live data for boost pressure, wastegate duty cycle, and other relevant parameters to pinpoint where the pressure loss is occurring.
  4. Smoke Test: A smoke test on the intake system can effectively reveal hard-to-find vacuum or boost leaks.

When to See a Shop:

  • If you cannot identify any obvious leaks or wastegate issues yourself.
  • If the problem persists after checking basic components.
  • If you notice any unusual noises from the turbocharger or engine bay.
  • Given the complexity of turbo systems, professional diagnosis is often recommended to accurately identify and repair the root cause of P0299.
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