Cylinder 11 Exhaust Valve Control Circuit High
Code P3488 indicates a high voltage condition detected in the exhaust valve control circuit for cylinder 11. This circuit controls the variable valve timing or lift system, often part of a VVT solenoid or camshaft actuator. A high voltage reading suggests a short to power, open circuit, or faulty component, which can disrupt valve timing and cause performance issues.
01. Most Common Causes
- Faulty exhaust valve control solenoid (VVT solenoid) on cylinder 11
- Short to battery voltage in the wiring harness
- Open or high resistance in the circuit
- Engine control module (ECM) failure
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or misfire
- Reduced engine power and fuel economy
- Possible engine knocking or hesitation
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Visually inspect wiring and connector for damage or corrosion at cylinder 11.
Step 3: Test the exhaust valve control solenoid resistance with a multimeter (compare to specs).
Step 4: Check for voltage at the solenoid connector with key on (should be battery voltage or pulsed signal).
Step 5: If wiring and solenoid are good, test ECM output or swap solenoid with another cylinder to isolate.
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 catalytic converter damage.
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 at $100-$150/hr).