Cylinder 12 Deactivation/Intake Valve Control Circuit High
The P3492 code indicates a high voltage condition in the cylinder deactivation or intake valve control circuit for cylinder 12. This system, often found in engines with Active Fuel Management (AFM) or Variable Valve Timing (VVT), uses solenoids or actuators to disable intake valves during light load to improve fuel economy. A high circuit voltage suggests a short to power, faulty solenoid, or wiring issue, which can prevent proper valve operation and trigger the check engine light.
01. Most Common Causes
- Faulty cylinder deactivation solenoid on cylinder 12
- Short to voltage in the wiring harness
- Corroded or damaged connector at the solenoid
- Engine control module (ECM) internal failure
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Engine misfire or rough idle
- Possible loss of power
03. 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: Measure voltage at the solenoid connector with key on; should be battery voltage. If high, check for short to power.
Step 4: Test solenoid resistance; compare to specs (typically 10-30 ohms). Replace if out of range.
Step 5: If wiring and solenoid are good, suspect ECM fault; perform ECM test or reprogram.
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 damage to the catalytic converter. Have it diagnosed 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 alone can be $30-$80.