Cylinder 6 Exhaust Valve Control Circuit Low
The P3447 code indicates that the powertrain control module (PCM) has detected a low voltage condition in the exhaust valve control circuit for cylinder 6. This circuit is part of a variable valve timing or cylinder deactivation system, which uses solenoids or actuators to control exhaust valve operation. A low circuit condition typically means the voltage is below the expected threshold, often due to a short to ground, faulty actuator, or wiring issue. This can cause the valve to remain closed or operate improperly, leading to reduced engine performance, misfires, or increased emissions.
01. Most Common Causes
- Faulty exhaust valve control solenoid/actuator on cylinder 6
- Short to ground in the control circuit wiring
- Corroded or damaged connector at the solenoid
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Reduced engine power and fuel economy
- Possible catalytic converter damage if ignored
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all codes and freeze frame data.
Step 2: Visually inspect the wiring and connector for cylinder 6 exhaust valve control circuit for damage, corrosion, or shorts.
Step 3: Measure resistance of the exhaust valve control solenoid; compare to manufacturer specs.
Step 4: Check for voltage at the solenoid connector with the engine running; should be within specified range.
Step 5: If wiring and solenoid are okay, test PCM output; replace PCM if necessary.
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.
How much does it cost to fix?▼
Typical repair costs range from $50 to $150 for diagnostic and simple wiring repairs, but replacing a solenoid or PCM can cost more.