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2020 Buick Encore GX 1.3T - Loss of Power and P0299 Code

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Mike T. · rep 0 · May 22, 3:49 AM · 1 replies · solved · Question

Vehicle: 2020 Buick Encore GX Preferred

Hi all,

My 2020 Buick Encore GX with the 1.3L turbo engine has been acting up. For the past week, I've noticed a significant loss of power, especially when accelerating onto the highway or going uphill. It feels sluggish, almost like the turbo isn't kicking in at all. The engine sounds a bit different too, maybe a slight whine that wasn't there before.

Yesterday, the Check Engine Light finally came on. I had it scanned at a local auto parts store, and it pulled a P0299 code, which I understand means 'Turbocharger/Supercharger Underboost'. Has anyone experienced this with their Encore GX or similar Buick models? What was the cause and solution?

I'm hoping it's not a major turbo replacement, as the car only has about 45,000 miles on it. Any advice on what to check first or what to expect would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:49 AM

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ClearTheCode admin answer:

The P0299 code (Turbocharger/Supercharger Underboost) on your 2020 Buick Encore GX 1.3T is a clear indicator that the engine's turbocharging system isn't producing the expected boost pressure. This directly explains your loss of power and sluggish acceleration.

Common Causes for P0299:

  1. Vacuum Leaks: Hoses or lines connected to the turbo system (wastegate actuator, bypass valve) can crack or become disconnected, leading to a loss of vacuum and improper turbo operation.
  2. Boost Leaks: Leaks in the intercooler, charge pipes, or intake manifold gaskets can allow boost pressure to escape, preventing it from reaching the engine.
  3. Faulty Wastegate Actuator: The wastegate controls exhaust gas flow to the turbo. If its actuator is stuck open or malfunctioning, the turbo won't spool correctly.
  4. Turbocharger Failure: While less common at 45,000 miles, a failing turbocharger (worn bearings, damaged compressor/turbine wheels) can cause underboost and often a distinct whining sound.
  5. Clogged Catalytic Converter: A severely restricted exhaust system, such as a clogged catalytic converter, can create excessive back pressure, preventing the turbo from spooling efficiently.
  6. Faulty Boost Pressure Sensor: A malfunctioning sensor could be providing incorrect readings to the Engine Control Module (ECM), leading it to believe there's an underboost condition when there isn't.

When to See a Shop:

  1. Immediate Attention: Driving with a P0299 code and significant power loss is not recommended. It can lead to reduced fuel economy and potentially more severe engine damage if the underlying cause is not addressed.
  2. Professional Diagnosis: A qualified technician will perform a thorough inspection, including:
    • Visual inspection of all turbo-related hoses, pipes, and connections for leaks or damage.
    • Testing the wastegate actuator and bypass valve operation.
    • Checking boost pressure readings with a scan tool.
    • Performing a smoke test to identify boost leaks.
    • Inspecting the turbocharger for signs of wear or damage.

Addressing this issue promptly will restore your vehicle's performance and prevent further complications.

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