P0999

2017-10-10

Description:

  • The fault code P0999 indicates an issue with the control circuit of shift solenoid 'F'. The shift solenoid is responsible for controlling the hydraulic pressure to engage or disengage specific gears in the transmission. This code is triggered when the control circuit of shift solenoid 'F' is detected to have a high voltage reading, indicating a potential electrical problem.

Possible Symptoms:

  • Malfunction Indicator Lamp (MIL) or Check Engine Light illuminated.

  • Harsh or delayed shifting.

  • Erratic or unpredictable shifting behavior.

  • Transmission slipping or failure to engage gears.

  • Decreased fuel efficiency.

  • Reduced engine performance or power.

  • Transmission overheating.

Possible Causes:

  • Faulty shift solenoid 'F'

  • Wiring or connector problem in the control circuit

  • Short circuit or high resistance in the circuit

  • Malfunctioning transmission control module (TCM)

  • Electrical power supply issues

Related Parts:

  • Shift Solenoid: It helps to change gears in automatic transmission cars. A bad solenoid causes difficulty in shifting gears

Possible Solutions:

  • Inspect the wiring and connectors in the control circuit for any damage, loose connections, or corrosion. Repair or replace as necessary.

  • Test the shift solenoid 'F' for proper operation. Replace if it is found to be faulty.

  • Check for any short circuits or high resistance in the control circuit. Repair the circuit as needed.

  • Verify the operation of the transmission control module (TCM). Update or replace if necessary.

  • Ensure the electrical power supply to the shift solenoid 'F' and TCM is stable and within the required specifications.

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