P2174 - Throttle Actuator Control System - Sudden Low Air Flow Detected

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3   
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Possible causes

  • Faulty Throttle Actuator Control (TAC) module
  • Throttle Actuator Control (TAC) module harness is open or shorted
  • Throttle Actuator Control (TAC) module circuit poor electrical connection
  • Throttle plate sticking due to carbon build-up
  • Engine Control Module (ECM)

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P2174 Description

The Engine Control Module (ECM) is the control center for the Throttle Actuator Control (TAC) system. The ECM determines the drivers intent and then calculates the appropriate throttle response. The ECM achieves throttle positioning by providing a pulse width modulated voltage to the TAC motor. The TAC system uses the following circuits for Motor control 1 and Motor control 2.

Two processors are also used to monitor the TAC system data. Both processors are located within the ECM. Both processors monitor each other's data to verify that the indicated throttle position is correct.

OBDII Code P2174 - Throttle Actuator Control System - Sudden Low Air Flow Detected - AutoCodes.com

P2174 Information for specific makes

  • P2174 CHRYSLER Low Airflow/Restriction Detected Instantaneous Accumulation
  • P2174 DODGE Low Airflow/Restriction Detected Instantaneous Accumulation
  • P2174 JEEP Low Airflow/Restriction Detected Instantaneous Accumulation
  • P2174 MITSUBISHI Low Airflow/Restriction Detected Instantaneous Accumulation

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P2174 Comments

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