Cylinder 10 Exhaust Valve Control Circuit/Open
Code P3477 indicates an open or malfunction in the exhaust valve control circuit for cylinder 10. This circuit is part of the variable valve timing (VVT) or cylinder deactivation system, which uses oil pressure to actuate the valve. An open circuit means the powertrain control module (PCM) detects no continuity or abnormal resistance in the solenoid or wiring, preventing proper valve operation and potentially causing misfires or reduced engine performance.
01. Most Common Causes
- Faulty exhaust valve control solenoid for cylinder 10
- Open or shorted wiring in the solenoid circuit
- Corroded or damaged connector at the solenoid
- Internal engine mechanical issue (e.g., stuck valve)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Reduced engine power and fuel economy
- Possible engine knocking or hesitation
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to verify code P3477 and check for related codes.
Step 2: Visually inspect the wiring and connector for cylinder 10 exhaust valve solenoid for damage, corrosion, or loose connections.
Step 3: Measure resistance of the solenoid; compare to manufacturer specs (typically 10-30 ohms).
Step 4: Check for voltage and ground at the solenoid connector with the engine running.
Step 5: If circuit tests OK, replace the exhaust valve control solenoid for cylinder 10.
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 the engine may misfire, causing catalytic converter damage or reduced performance. Have it diagnosed promptly.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts (solenoid $50-$150) and labor (1-2 hours).