Cylinder 5 Exhaust Valve Control Circuit High
The P3440 code indicates a high voltage condition in the exhaust valve control circuit for cylinder 5. This circuit is part of the variable valve timing (VVT) system, which adjusts exhaust valve timing for optimal performance and emissions. A high voltage reading suggests a short to power, faulty actuator, or wiring issue, potentially causing poor engine performance and increased emissions.
01. Most Common Causes
- Short to power in the exhaust valve control circuit
- Faulty exhaust valve actuator (VVT solenoid) on cylinder 5
- Damaged wiring or connector in the circuit
- Engine control module (ECM) failure
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or misfire on cylinder 5
- Reduced engine power and fuel economy
- Failed emissions test
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect wiring and connector for cylinder 5 exhaust valve actuator for damage or corrosion.
Step 3: Test the actuator resistance and compare to specifications (typically 6-12 ohms).
Step 4: Check for voltage at the actuator connector with key on; should be battery voltage on one pin and ground on the other. If voltage is high or erratic, repair short to power.
Step 5: If wiring and actuator are good, suspect ECM fault 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 performance issues and potential damage to the catalytic converter.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on the cause (e.g., wiring repair vs. actuator replacement).