WOMS
P code powertrain Medium severity

P1654 Recirculation Override Circuit Malfunction

The OBD2 code P1654 indicates a malfunction in the recirculation override circuit, which typically affects the operation of the vehicle's heating, ventilation, and air conditioning (HVAC) system

Definition

The OBD2 code P1654 indicates a malfunction in the recirculation override circuit, which typically affects the operation of the vehicle's heating, ventilation, and air conditioning (HVAC) system

Common causes

  • Faulty recirculation control actuator
  • Damaged wiring or connectors
  • Short circuit in the recirculation circuit
  • Open circuit in the recirculation circuit
  • Malfunctioning HVAC control module
  • Software issues in the vehicle's control module
  • Vacuum leaks in the HVAC system
  • Failed or stuck recirculation door

Common misdiagnoses

  • Faulty EGR valve
  • Bad wiring or connectors
  • Malfunctioning PCM (Powertrain Control Module)
  • Incorrectly diagnosed vacuum leaks
  • Faulty intake manifold pressure sensor
  • Issues with the throttle position sensor
  • Problems with the fuel pressure regulator

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Addressing any related codes can help narrow down the issue

  2. 2. Inspect the Recirculation Actuator

    The recirculation actuator controls the airflow direction. Check for any physical damage, binding, or malfunctioning of the actuator. Ensure it is properly connected and functioning

  3. 3. Examine Wiring and Connectors

    Inspect the wiring and connectors associated with the recirculation actuator and the HVAC control module. Look for signs of corrosion, fraying, or loose connections that could cause a malfunction

  4. 4. Test the Actuator

    If possible, manually test the recirculation actuator to see if it responds correctly to commands from the HVAC control module. You may need a multimeter to check for proper voltage and ground

  5. 5. Check the HVAC Control Module

    The issue may lie within the HVAC control module itself. Ensure that it is functioning correctly and that there are no internal faults

  6. 6. Inspect Fuses and Relays

    Check the fuses and relays associated with the HVAC system. A blown fuse or faulty relay can cause the recirculation circuit to malfunction

  7. 7. Look for Vacuum Leaks

    Some vehicles use vacuum-operated actuators for the HVAC system. Check for any vacuum leaks in the system that could affect the operation of the recirculation feature

  8. 8. Clear the Code and Test Drive

    After performing the above checks and repairs, clear the trouble code using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  9. 9. Seek Professional Help

    If you are unable to diagnose or fix the issue, consider taking the vehicle to a qualified mechanic or dealership for further diagnosis and repair. By following these steps, you should be able to identify and resolve the issue causing the P1654 code