P078F

Transmission Mode Switch C Circuit

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–56 (est.)

Symptoms

Delayed gear shifting
The transmission goes into emergency mode
Inability to switch between modes
Check Engine Light Is On
Loss of engine power

Causes

Transmission mode switch malfunction
Open or short circuit in the circuit
Poor contact in connectors
Wiring harness damage
Problems with the transmission control unit

How to Fix

Check the continuity of the switch circuit
Inspect connectors and contacts for corrosion
Test the mode switch with a multimeter
Check circuit resistance
If necessary, replace the mode switch

Related codes

P078D P078E P0790