P3493

Cylinder 12 Exhaust Valve Control Circuit/Open

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–89 (est.)

Symptoms

Unstable engine operation
Reduced engine power
Increased fuel consumption
Check Engine Light Is On
Possible misfire in cylinder 12

Causes

Broken wire in the control circuit
Control solenoid valve malfunction
Wiring harness damage
Poor contact in the connector
Malfunction of the engine control unit (rare)

How to Fix

Check the continuity of the exhaust valve control circuit.
Inspect the connectors and contacts
Check the resistance of the solenoid valve
Replace faulty control valve or wiring
Reset the error and check the system operation

Related codes

P3490 P3491 P3492