P3478
Cylinder 10 Exhaust Valve Control Circuit Performance
P3478 is an OBD-II diagnostic trouble code meaning: Cylinder 10 Exhaust Valve Control Circuit Performance. Common causes: faulty exhaust valve control solenoid valve, open or short circuit in control circuit. Estimated repair cost: $17–89.
Symptoms
- Unstable engine operation
- Reduced engine power
- Increased fuel consumption
- Check Engine Light Is On
- Dips during acceleration
Causes
- Faulty exhaust valve control solenoid valve
- Open or short circuit in control circuit
- Poor contact in control circuit connectors
- Engine control unit malfunction
- Mechanical problems with exhaust valve
How to Fix
- Check the condition of the exhaust valve control solenoid valve
- Check the integrity of the wiring and connectors in the control circuit
- Test control circuit resistance
- Check control signals from the engine control unit
- If necessary, replace faulty components
Related codes
Error P3478 by Vehicle Brand
FAQ
What does the P3478 code mean?
P3478 is an OBD-II diagnostic trouble code that indicates: Cylinder 10 Exhaust Valve Control Circuit Performance
What causes a P3478 error code?
The most common causes of P3478 include: Faulty exhaust valve control solenoid valve; Open or short circuit in control circuit; Poor contact in control circuit connectors; Engine control unit malfunction.
How do I fix a P3478 diagnostic trouble code?
To fix P3478: Check the condition of the exhaust valve control solenoid valve. Check the integrity of the wiring and connectors in the control circuit. Test control circuit resistance. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P3478?
Yes, but get it checked soon
How much does it cost to fix P3478?
The estimated repair cost for P3478 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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