Cylinder 11 Exhaust Valve Control Circuit Low
Code P3487 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 part of a variable valve timing or cylinder deactivation system, and a low voltage reading suggests a short to ground, open circuit, or faulty component. The issue can cause misfires, reduced power, and increased emissions.
1. Most Common Causes
- Defective cylinder 11 exhaust valve solenoid actuator with low internal resistance
- Short circuit to ground in the actuator control circuit wiring
- Corroded, loose, or damaged connector or terminal in the actuator circuit
- Excessive resistance in the wiring due to splices, pinches, or insulation deterioration
- Internal failure of the engine control module (ECM/PCM) circuit driver
- Mechanical issue in the exhaust valve mechanism causing electrical overload
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Reduced engine power and performance
- Poor fuel economy
3. 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 11 exhaust valve control circuit for damage, corrosion, or loose connections.
Step 3: Measure resistance and voltage at the solenoid connector with a multimeter; compare to manufacturer specifications.
Step 4: Test the solenoid by applying battery voltage and ground; listen for a click and measure resistance.
Step 5: If wiring and solenoid are good, check for a faulty PCM by performing a continuity test from the PCM to the solenoid.
4. 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 power, and potential damage to the catalytic converter. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on whether it's a simple wiring fix or solenoid replacement. Parts and labor vary by vehicle.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.