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2018 Renegade 1.4L Turbo Loss of Power & Check Engine Light (P0299)

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Kim L. · rep 0 · May 22, 3:22 AM · 1 replies · solved · Question

Vehicle: 2018 Jeep Renegade Latitude

Hey guys, my 2018 Jeep Renegade Latitude with the 1.4L MultiAir Turbo engine has been acting up. Recently, I've noticed a significant loss of power, especially when accelerating onto the highway. It feels sluggish, almost like the turbo isn't kicking in.

To make things worse, the 'Check Engine' light came on, and when I scanned it, I got a P0299 code, which I understand means 'Turbocharger/Supercharger Underboost'.

What are the common culprits for this code on these Renegades? Could it be a simple vacuum leak, or am I looking at a more serious turbo issue? Any advice on what to check or what to expect from a repair shop would be great.

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode admin answer:

The P0299 (Turbocharger/Supercharger Underboost) code on your 2018 Jeep Renegade 1.4L MultiAir Turbo is a clear indicator that the engine's boost pressure is lower than what the Powertrain Control Module (PCM) expects. This directly translates to the loss of power you're experiencing.

Common Causes for P0299:

  1. Boost Leaks: This is the most frequent cause. Leaks can occur in the intercooler hoses, charge pipes, or connections between the turbo and the intake manifold. Even a small crack can cause significant boost loss.
  2. Wastegate Actuator/Solenoid Failure: The wastegate controls exhaust gas flow to the turbo. If the actuator or its control solenoid (often vacuum-operated) fails, the wastegate might stay open, preventing proper boost generation.
  3. Turbocharger Failure: While less common than leaks or wastegate issues, the turbocharger itself can fail (e.g., worn bearings, damaged impeller).
  4. MAP (Manifold Absolute Pressure) Sensor or Boost Sensor Issues: A faulty sensor could be reporting incorrect boost pressure to the PCM, even if the actual pressure is fine.
  5. Clogged Catalytic Converter: Excessive back pressure from a partially clogged catalytic converter can hinder turbo performance, though this usually comes with other symptoms like reduced exhaust flow.
  6. PCV System Issues: A failing PCV system can sometimes create vacuum issues that affect boost control.

Troubleshooting Steps:

  1. Visual Inspection: Carefully inspect all visible turbocharger hoses, intercooler pipes, and connections for cracks, loose clamps, or disconnections.
  2. Listen for Hissing Sounds: With the engine running, listen for any hissing or whooshing sounds that might indicate a boost leak.
  3. Check Wastegate Actuator: A mechanic can test the wastegate actuator's operation, often using a vacuum pump.
  4. Scan for Other Codes: Sometimes, P0299 can be accompanied by other codes that provide more specific clues.

When to See a Shop:

Because turbo systems are complex and involve precise pressure management, it's highly recommended to have your Renegade inspected by a qualified mechanic or a Jeep dealership. They have specialized diagnostic tools to perform boost leak tests, monitor sensor readings in real-time, and accurately diagnose the root cause of the underboost condition. Driving with a P0299 code for an extended period can lead to reduced performance, decreased fuel economy, and potentially further engine or turbo damage.

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