Cylinder 12 Deactivation/Intake Valve Control Circuit High
The P3492 code indicates that the powertrain control module (PCM) has detected a high voltage condition in the cylinder deactivation or intake valve control circuit for cylinder 12. This system uses solenoids to disable intake valves during low-load operation to improve fuel economy. A high voltage reading suggests a short to power, faulty solenoid, or wiring issue.
1. Most Common Causes
- Short to battery voltage (B+) in the wiring of the cylinder 12 intake valve control solenoid
- Internal short circuit in the cylinder 12 intake valve deactivation solenoid or actuator
- Damaged or corroded connector or pin in the solenoid harness
- Internal failure of the engine control module (ECM/PCM) driver for that circuit
- Excessive resistance in the solenoid ground circuit
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Engine misfire or rough idle
- Loss of power or hesitation
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the wiring and connector for cylinder 12 deactivation solenoid for damage or corrosion.
Step 3: Use a multimeter to check for voltage at the solenoid connector with key on; should be battery voltage. If high (e.g., >12.6V), suspect short to power.
Step 4: Test the solenoid resistance; compare to specs (typically 10-30 ohms). Replace if out of range.
Step 5: Clear codes and test drive to see if code returns.
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 fuel economy, and potential catalytic converter damage. Have it diagnosed promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for a DIY solenoid replacement, or $150 to $400 at a shop including diagnosis and labor.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.