Cylinder 11 Exhaust Valve Control Circuit Low
The P3487 code indicates that the powertrain control module (PCM) has detected a low voltage condition in the exhaust valve control circuit for cylinder 11. This circuit is responsible for controlling the exhaust valve timing or lift, often via a solenoid or actuator. 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 11
- 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
- Rough idle or misfire on cylinder 11
- Reduced engine power or performance
- Poor fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data. Clear codes and test drive to see if P3487 returns.
Step 2: Visually inspect the exhaust valve control solenoid/actuator and its wiring for damage, corrosion, or loose connections.
Step 3: Use a multimeter to check the control circuit voltage at the solenoid connector. Compare to manufacturer specifications (typically 12V or 5V reference).
Step 4: Test the solenoid resistance and actuation with a scan tool or direct power/ground. Replace if out of spec.
Step 5: If circuit and solenoid are good, check for PCM issues or perform a continuity test from PCM to solenoid.
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 misfire, reduced power, and potential catalytic converter damage. Seek repair promptly.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. Replacing a solenoid or actuator can range from $100-$300, plus labor. Total repair may be $150-$500 depending on the cause.