P078C

Shift Timing Solenoid B Low

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–56 (est.)

Symptoms

Incorrect gear shifting
The gearbox goes into emergency mode
Delays when shifting gears
Jerking when switching
Check Engine light comes on

Causes

Open or short circuit in solenoid circuit
Shift solenoid malfunction
Connector problems or contact corrosion
Transmission control module (TCM) malfunction
Circuit power problems

How to Fix

Check continuity of solenoid B
Check solenoid resistance
Inspect connectors and contacts for corrosion
Check power supply to solenoid circuit
Replace solenoid B if necessary

Related codes

P078B P078D P075B