P0789

2017-10-10

Description:

  • The fault code P0789 indicates that there is an intermittent issue with the shift/timing solenoid circuit, which is responsible for controlling the transmission shifting. This may cause problems while shifting gears or may cause the transmission to not shift at all.

Possible Symptoms:

  • Transmission may not shift at all

  • Issues while shifting gears

  • Rough shifting or delayed shifting

  • Illuminated check engine light

Possible Causes:

  • Faulty shift/timing solenoid

  • Faulty wiring or connections in the circuit

  • Loose or corroded electrical connections

  • Failed transmission control module (TCM)

Related Parts:

  • Transmission Shift Sensor: Gear Shift Sensor communicates the position the gear shifted to. Problems lead to difficulty in shifting gears

Possible Solutions:

  • Replace the shift/timing solenoid

  • Check and repair any damaged wiring or connections

  • Tighten or clean any loose or corroded electrical connections

  • Replace the transmission control module (TCM) if necessary

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