Cylinder 1 Exhaust Valve Control Circuit Low
The P3407 code indicates that the engine control module (ECM) has detected a low voltage condition in the exhaust valve control circuit for cylinder 1. This circuit is part of the variable valve timing (VVT) or cylinder deactivation system, which controls the exhaust valve lift or timing. A low voltage signal suggests a short to ground, open circuit, or faulty component, potentially causing improper valve operation, reduced engine performance, and increased emissions.
01. Most Common Causes
- Faulty exhaust valve control solenoid on cylinder 1
- Short to ground in the wiring or connector of the exhaust valve control circuit
- Open circuit in the exhaust valve control circuit
- Failed engine control module (ECM)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or misfire on cylinder 1
- Reduced engine power and fuel economy
- Possible engine stalling or hesitation
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Visually inspect the wiring and connector for cylinder 1 exhaust valve control solenoid for damage, corrosion, or loose connections.
Step 3: Using a multimeter, check the resistance of the exhaust valve control solenoid; compare to manufacturer specs.
Step 4: Test the circuit voltage at the solenoid connector with the ignition on; should be near battery voltage. If low, check for shorts or opens.
Step 5: If circuit and solenoid are good, suspect a faulty ECM and perform further diagnostics.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause engine misfire, reduced performance, and potential damage to the catalytic converter. Immediate diagnosis is advised.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and simple repairs like wiring fixes, but can be higher if the solenoid or ECM needs replacement.