P078F
Generic code
Free on OBD DashX
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What P078F means
- 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
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.
Free on OBD DashX
P078F on OBD DashX
Real-world causes, how often this code shows up, and the fix — step by step.
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