What Does P3405 Mean?
The PCM has detected an open circuit in the cylinder 1 exhaust valve control system. This indicates a complete loss of electrical continuity in the wiring or solenoid circuit for the variable valve timing/lift mechanism on cylinder 1's exhaust valve.
Common Causes
35%
Broken or disconnected wiring harness to exhaust valve solenoid
30%
Failed exhaust valve control solenoid (internal open circuit)
20%
Corroded or damaged connector pins at solenoid or PCM
10%
Failed PCM driver circuit
5%
Blown fuse in valve control circuit
Diagnostic Steps
1
Step 1: Visually inspect wiring harness and connectors to cylinder 1 exhaust valve solenoid for damage, corrosion, or disconnection
2
Step 2: Check continuity of wiring from solenoid connector to PCM using wiring diagram
3
Step 3: Measure resistance of exhaust valve control solenoid (typically 6-12 ohms) and compare to specifications
4
Step 4: Check for power and ground at solenoid connector with key on, engine off
5
Step 5: If all wiring and solenoid test good, suspect PCM failure and verify with known-good component or PCM replacement
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The PCM has detected an open circuit in the cylinder 1 exhaust valve control system. This indicates a complete loss of electrical continuity in the wiring or solenoid circuit for the variable valve timing/lift mechanism on cylinder 1's exhaust valve.
The most common cause of P3405 (Cylinder 1 Exhaust Valve Control Circuit/Open) is: Broken or disconnected wiring harness to exhaust valve solenoid
Typical repair costs for P3405 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle remains drivable but may experience reduced performance and fuel economy. Extended operation may cause additional engine stress or catalytic converter damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3405 to identify the root cause.
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Quick Info
Category
Powertrain
System
Variable Valve Timing/Lift System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
