2013-2021 Trax & Encore Intercooler Leaks: P0299 Code, Symptoms, and Replacement

Symptoms of a Failing Intercooler

A bad intercooler is essentially a major air leak in the engine's intake system. This leak, known as a 'boost leak,' prevents the turbo from building the pressure needed for proper performance. Symptoms are often most noticeable when accelerating.

• Noticeable Loss of Power: The vehicle will feel sluggish and slow to accelerate, especially when you demand power for passing or climbing hills.
• Hissing or Whistling Noises: A distinct hissing or whistling sound from the front of the engine bay during acceleration is a classic sign of a boost leak. This is the sound of high-pressure air escaping from a crack in the intercooler or its connections.
• Check Engine Light: A significant boost leak will almost always trigger the Check Engine Light. The most common trouble code is P0299 (Turbocharger/Supercharger Underboost). You may also see codes like P0101 (Mass Air Flow Sensor Circuit Range/Performance) as the engine's computer struggles to reconcile the expected airflow with the actual (leaking) airflow.
🎬 Watch: Diagnosing P0299 and boost sensor issues on a Chevy Trax.
• Poor Fuel Economy: Your engine has to work harder and use more fuel to compensate for the lack of boost, leading to a drop in MPG.
• Black Smoke from Exhaust: In some cases, a rich air-fuel mixture caused by the boost leak can lead to black smoke from the exhaust, as unburned fuel is sent out the tailpipe.

Known Issues for the Trax & Encore 1.4L Intercooler

The intercooler on the 1.4L LUV engine is known for a few specific issues. While not subject to a direct recall, its related components and symptoms are well-documented in technical service bulletins (TSBs).

Cracked Plastic End Tanks

The most common failure point is a crack developing in the plastic end tanks that are crimped to the aluminum core. Over time, constant exposure to heat, pressure, and engine vibration can cause the plastic to become brittle and fail, creating a boost leak.

Icing in Cold Climates (TSB 16-NA-405)

General Motors issued Technical Service Bulletin 16-NA-405 for poor engine performance in extremely cold weather (-18°C / 0°F or colder). This issue involves moisture and oil vapor from the PCV system freezing inside the intercooler, restricting airflow. This can cause a range of symptoms, including a P0299 underboost code. GM released a revised intercooler design with wider fin spacing to help mitigate this issue. While the TSB outlines a comprehensive fix including new PCV components, the intercooler itself is a key part of the problem in cold climates.

Turbocharger Failures (Special Coverage N232395330)

While not a direct fault of the intercooler, it's important to note that GM has a special coverage program for turbocharger failure on some 2017-2018 models, which can also cause a P0299 code. A failing turbo can contaminate the intercooler with excessive oil. If you are replacing a failed turbo, it is critical to clean or replace the intercooler to prevent debris from entering the new turbo or the engine.

Buying a Used Intercooler: What to Check

A used OEM intercooler can be a smart, cost-effective replacement. They are built to GM's original quality standards and often outlast cheap aftermarket alternatives. Here’s what to inspect to ensure you get a good part.

Physical Inspection Checklist

• Check the End Tanks: This is the most critical step. Carefully inspect the plastic end tanks on both sides for any hairline cracks, especially where the plastic meets the aluminum core and around the inlet/outlet ports.
• Inspect the Core: Look for signs of major impact damage. A few bent cooling fins are purely cosmetic and will not affect performance. However, avoid units with large areas of crushed fins or damage that appears to have punctured the core.
• Verify Mounting Points: Ensure all mounting tabs and the crucial vertical alignment dowels are intact and not broken. Broken tabs can cause vibration, leading to premature failure.
• Look Inside the Ports: Shine a flashlight into the inlet and outlet ports. A very thin film of oil is normal for any turbocharged vehicle. However, if you see pooled oil or thick, black sludge, it's a red flag. The intercooler may have come from a vehicle with a severely failed turbo, and it may be difficult to fully clean out the contamination.

Replacement Overview

Replacing the intercooler on a Trax or Encore is a moderately difficult job that typically requires removing the front bumper cover to gain access. The intercooler is sandwiched between the A/C condenser and the radiator. While no highly specialized tools are required, a good set of sockets, Torx drivers, and trim removal tools will be necessary. The process involves disconnecting the charge pipes, unbolting the unit from its mounts, and carefully separating it from the radiator and condenser.

Cost to Replace a Trax or Encore Intercooler

The cost can vary significantly based on the parts you choose and whether you do the work yourself.

Frequently Asked Questions (FAQ)