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P0299 Error Code Definition

The P0299 error code reveals that your vehicle’s supercharger or turbocharger is not working correctly. The most common diagnosis reveals an underboost problem.

The error commonly appears when the ECU detects low turbocharger or supercharger low boost pressure. This parameter is continuously monitored by ECU, which uses the boost pressure sensor or/and the MAP sensor.

P0299 Error Symptoms

Many easily distinguishable indicators point to a P0299 error:

  • The check engine light on
  • Poor throttle acceleration performance
  • Increased exhaust
  • Occasional engine misfires
  • Fuel economy failure
  • Mechanical noise or even a whining engine sound

P0299 Error Causes

The leading cause of a P0299 error is a failure of the turbocharger wastegate regulating valve solenoid. Yet multiple reasons can lead to the error or influence it, such as:

  • Air leak between the supercharger and throttle
  • The wastegate control hose is open or stuck
  • Low fuel pressure
  • Low oil pressure
  • Faulty boost pressure sensor
  • Faulty injector control pressure sensor

P0299 Error Consequences

Though you might consider disregarding this error, you need to understand that it usually has mechanical causes. These causes can lead to severe damage to your turbocharger and your engine. Addressing the issue with a professional is recommended in order to diagnose and repair the causes properly.

P0299 Diagnosis Process

The diagnosis process is quite common. However, since the P0299 error can be similar to other errors, your vehicle needs a thorough and extensive analysis. Use traditional diagnosis methods, as well. Determining the actual cause of the P0299 error is mandatory in setting the right course of action with minimal cost for the owner.

Sometimes the cause can be as simple as a stuck solenoid valve, which can be replaced in a single afternoon. Dismissing other potential causes is a frequent mistake made by inexperienced mechanics. But this mistake can lead to even more severe consequences, which you need to avoid at all costs.

There are several steps in completing a full diagnosis and repair:

  • Preliminary steps – Clear the ECU memory and complete an entire driving cycle. This will eliminate the data trouble code memory.
  • Visual inspection – Inspect the vacuum hoses, MAF condition, MAP (manifold absolute pressure) sensor connector/wiring, boost pressure sensor connector/wiring, air/filter inspection, and exhaust pipe/manifold inspection.
  • Fuel system tests – Test fuel pump pressure and clogged fuel filters (in-line and tank elements).
  • Electrical tests – Test the boost pressure sensor, the MAP sensor ground, and the MAP sensor reference voltage.
  • Scan Tool tests – The use of a professional scan tool and save the MAF (Mass air flow sensor) diagnosis time. Conduct a MAP sensor live test, boost pressure sensor live test, and a supercharger/turbocharger functional test.

Repairing P0299 Error Code

Depending on the cause found upon diagnosing the P0299 error code, various repairs could be addressed. As stated above, the issue could be as simple as replacing a valve or wiring/connectors. It could also involve changing the exhaust pipe, air filter, different fuel system elements, or replacing the entire turbocharger.

Keep in mind that you need to address any error promptly to avoid further damage to your vehicle. You can also prolong the engine’s life.

Taylor Diesel can help diagnose and repair issues caused by the PO299 error code.  For more information, contact us!

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