P3478

Cylinder 10 Exhaust Valve Control Circuit Performance

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–89 (est.)

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

P3477 P3479 P3480