P0978

2017-10-10

Description:

  • The fault code P0978 indicates a range or performance issue in the control circuit of shift solenoid 'C' in the transmission. The shift solenoids are responsible for controlling the engagement and disengagement of specific gears in the transmission. A range or performance issue in the control circuit can result in improper gear shifting, erratic shifting behavior, or transmission performance issues.

Possible Symptoms:

  • Improper or erratic gear shifting.

  • Delayed or prolonged shifting between gears.

  • Slipping or inability to engage certain gears.

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

  • Limited or no communication with the TCM through diagnostic tools.

  • Other associated transmission

  • related fault codes may be present.

  • No noticeable drivability issues are typically associated with this fault code.

Possible Causes:

  • Faulty shift solenoid 'C'

  • Wiring or electrical connection issues in the control circuit of shift solenoid 'C'

  • Malfunctioning transmission control module (TCM)

  • Low battery voltage

  • Internal transmission mechanical problems

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 electrical connections in the control circuit of shift solenoid 'C' for any damage, loose connections, or corrosion. Repair or replace as necessary.

  • Test and replace the faulty shift solenoid 'C', if necessary.

  • Verify the functionality of the transmission control module (TCM). Replace if it is defective.

  • Ensure the battery voltage is at the proper level. Charge or replace the battery if necessary.

  • If other transmission

  • related issues are present, further diagnostic procedures or repairs may be required.

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