Cylinder 10 Exhaust Valve Control Circuit Low
The P3479 code indicates that the powertrain control module (PCM) has detected a low voltage condition in the exhaust valve control circuit for cylinder 10. This circuit is responsible for controlling the exhaust valve timing or lift, often via an electromechanical actuator or solenoid. A low voltage reading suggests a short to ground, open circuit, or faulty component, which can disrupt valve operation and cause performance issues.
01. Most Common Causes
- Faulty exhaust valve control solenoid/actuator on cylinder 10
- Short to ground in the control circuit wiring
- Open circuit or high resistance in the wiring or connector
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Reduced engine power and fuel economy
- Possible engine hesitation or stalling
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P3479 and check for related codes.
Step 2: Visually inspect the wiring and connector for cylinder 10 exhaust valve control circuit for damage, corrosion, or loose pins.
Step 3: Measure voltage at the control circuit with a multimeter; compare to manufacturer specifications (typically 12V or 5V reference).
Step 4: Test the exhaust valve control solenoid/actuator resistance and operation per service manual.
Step 5: If wiring and component test OK, check PCM for faults or perform a PCM reset.
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 issue can cause engine misfire, reduced performance, and potential catalytic converter damage. Have it diagnosed promptly.
How much does it cost to fix?▼
Repair costs typically range from $200 to $600, depending on whether the solenoid, wiring, or PCM needs replacement, and labor rates.