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P2175 Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.

Definition

Throttle Actuator Control System Low Air Flow Detected

Meaning

P2175 is a generic OBD-II code generated by the engine control module (ECM) if the mass air flow sensor detects insufficient air flow by comparing the throttle angle to the amount of air entering.

Causes

These are the most common causes of this code:

  • Clogged air filters limit the amount of air that can enter.
  • You have a shorted air flow sensor.
  • This is due to an incorrect throttle position sensor.

Symptoms

Failures have varying degrees of severity. The failure is severe if it is mechanical. A PCM can compensate adequately for a mild electrical failure, as the power supply doesn't need to be as strong as it is.

P0469 codes can cause the following symptoms:

  • An error code will be stored in the ECM memory as a fault and the Check Engine Light will illuminate.
  • It may not have enough power, surge, or throttle control.

Diagnosis

It depends on location, the make and model of the vehicle, and even the engine type when it comes to auto repair's diagnosis time and labor rates. But the commons steps are:

  • Examines the freeze frame data for failures after scanning for codes and documenting the code in the ECM
  • Inspects the intake tube and air filter for obstructions
  • Ensures there are no obstructions in the throttle
  • Replacement and diagnosis of the air flow sensor are performed using the manufacturer's pinpoint tests

Common mistakes

  • Obtaining the freeze frame data first and then checking the ECM memory codes for the main failure, so that the same failure may be duplicated and repaired
  • When the ECM code has been fixed, but it has not been cleared
  • Not verifying whether the sensor is defective before replacing it

How serious is this?

A P2175 code indicates that you do not have the proper amount of air entering the engine as determined by comparing the air-flow sensor with the throttle opening. Low power and the Check Engine Light will prevent the engine from passing emission tests.

What repairs can fix the code?

  • Clean and replace the air filter.
  • Installing a new air flow sensor (after the control has been tested and cleaned)
  • Fixing air flow sensor wiring shorts or open circuits

Related codes

None listed.

Conclusion

A P2175 code indicates that you do not have the proper amount of air entering the engine as determined by comparing the air-flow sensor with the throttle opening. Low power and the Check Engine Light will prevent the engine from passing emission tests. The problem can be temporarily corrected by cleaning the air flow sensor regularly. The air flow sensor can also be cleaned and a factory paper filter installed to correct this issue.

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