P3429

Cylinder 4 Exhaust Valve Control Circuit/Open

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–111 (est.)

Symptoms

Check Engine light comes on
Decreased fuel economy
Unstable engine operation
The engine runs intermittently
Possible loss of power

Causes

Malfunction of the solenoid valve control of the exhaust valve of cylinder No. 4
Open or short circuit in control circuit wiring
Poor connection in solenoid valve connector
Engine control module (ECU) malfunction
Wiring harness damage

How to Fix

Check the #4 cylinder solenoid valve wiring and connectors for damage or corrosion.
Check the solenoid valve for resistance and functionality.
Check the continuity of the control circuit from the ECU to the solenoid valve.
Replace the faulty solenoid valve.
Replace or reprogram the ECU if necessary.

Related codes

P3400 P3425 P3427