P078C
Shift Timing Solenoid B Low
P078C is an OBD-II diagnostic trouble code meaning: Shift Timing Solenoid B Low. Common causes: open or short circuit in solenoid circuit, shift solenoid malfunction. Estimated repair cost: $17–56.
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
Error P078C by Vehicle Brand
FAQ
What does the P078C code mean?
P078C is an OBD-II diagnostic trouble code that indicates: Shift Timing Solenoid B Low
What causes a P078C error code?
The most common causes of P078C include: Open or short circuit in solenoid circuit; Shift solenoid malfunction; Connector problems or contact corrosion; Transmission control module (TCM) malfunction.
How do I fix a P078C diagnostic trouble code?
To fix P078C: Check continuity of solenoid B. Check solenoid resistance. Inspect connectors and contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P078C?
Limited driving only, diagnose soon
How much does it cost to fix P078C?
The estimated repair cost for P078C is $17–56. Actual cost depends on your vehicle, location, and labor rates.
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