P2173 Fault Code

Throttle Actuator Control System High Airflow Detected

• What does that mean?
• Symptoms
• Causes
• Solutions

• The P2173 fault code indicates that the engine control module (ECM) has detected an issue with the throttle actuator control system. Specifically, this code signifies that high airflow has been detected when the throttle is in a closed position.
• This situation can lead to engine performance issues and may affect the vehicle's drivability as the throttle position does not align with the actual airflow being reported by the ECM.

What are the symptoms of the P2173 code?

• Symptoms associated with the P2173 code may include:
  • Unstable engine idle or stalling when the throttle is closed.
  • Decreased engine performance, particularly during acceleration.
  • Check Engine Light (CEL) illuminated on the dashboard.
  • Poor fuel economy due to improper throttle control.
  • Increased emissions as a result of unregulated airflow.

What causes the P2173 code?

• Common causes of the P2173 fault code include:
  • Faulty throttle actuator or motor.
  • Issues with the throttle position sensor (TPS).
  • Vacuums leaks in the intake system that increase airflow unexpectedly.
  • Electrical issues such as wiring faults or poor connections related to the throttle control system.
  • Dirty or malfunctioning idle air control (IAC) valve.

How to fix P2173?

• To resolve the P2173 code, follow these recommended steps:
  • Inspect the throttle actuator for any signs of damage or malfunction.
  • Check the throttle position sensor for proper operation; replace if necessary.
  • Examine intake hoses and gaskets for vacuum leaks and repair any found issues.
  • Clean or replace the idle air control valve if it is dirty or malfunctioning.
  • Ensure all wiring connections related to the throttle actuator are secure and free of corrosion.
  • After repairs, clear the fault codes and perform a test drive to ensure the issue is resolved.