P3494

Cylinder 12 Exhaust Valve Control Circuit Performance

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–89 (est.)

Symptoms

Engine power drop
Unstable engine operation
Increased fuel consumption
Check Engine Light Illuminates
Possible misfires

Causes

Open or short circuit in control circuit
VVT solenoid valve malfunction
Poor electrical contact in the connector
Mechanical stuck exhaust valve
Engine control unit malfunction

How to Fix

Check valve control circuit integrity
Check the resistance and operation of the solenoid valve
Inspect and clean electrical contacts
Check voltage on control circuit
If necessary, replace the faulty valve or wiring harness.

Related codes

P3490 P3491 P3493