P078F

2017-10-10

Description:

  • Transmission Mode Switch C Circuit

Possible Symptoms:

  • Inspect and clean the transmission mode switch contacts

  • Replace the faulty transmission mode switch

  • Check and repair any damaged wiring or connections related to the transmission mode switch

  • Inspect and repair the transmission control module (TCM) if necessary

Possible Causes:

  • Faulty transmission mode switch

  • Loose or corroded electrical connections to the transmission mode switch

  • Damaged or worn wiring harness leading to the transmission mode switch

  • Faulty transmission control module

  • Low transmission fluid levels or contaminated fluid

Related Parts:

Possible Solutions:

  • The vehicle may experience shifting difficulties or may not shift at all.

  • The transmission may stay in a single gear and not shift up or down.

  • The engine may rev high without any increase in vehicle speed or acceleration.

  • The vehicle may go into a limp mode, limiting the engine's performance or speed.

  • The check engine light may illuminate on the dashboard.

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