Description of DTC code P2173

The vehicle's computer constantly monitors intake manifold pressure to calculate the air/fuel ratio. When some vacuum leaks occur, it is most likely due to manifold damage.

The OBD2 DTC P2173 indicates that the PCM (Powertrain Control Module) has detected a malfunction in the TAC (Throttle Actuator Control) system. Specifically, it refers to high air flow in the TAC system.

Symptoms of fault code P2173

  • Check Engine light ON.
  • The engine may fail to start.
  • Low throttle response.
  • The automatic transmission fails to shift.
  • Other error codes set.
  • Flaccid mode activated.

Causes of OBD2 P2173

Reasons for setting the P2173 OBDII diagnostic code:

  • The engine may be overheating.
  • Vacuum leaks are very likely.
  • Manifold absolute pressure may not be working properly.
  • Perhaps there are systems with voltages outside the allowed range.

Possible solutions of the DTC code P2173

Steps to troubleshoot the P2173 OBD2 error code:

  • As a first step, it is recommended to consult the TSB (Technical Service Bulletins).
  • Perform a PCM scan looking to identify other DTCs. Take into account that the P2173 code is informative and warns that the Throttle Actuator Control system is not working as expected.
  • Check all the cables and connectors of the TAC system for damage. Corrections should be made accordingly.

Codes related to P2173

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