Cylinder 12 Deactivation/Intake Valve Control Circuit/Open
Code P3489 indicates an open or malfunction in the intake valve control circuit for cylinder 12's deactivation system. This circuit controls oil flow to the valve lifters to disable the cylinder under light load. An open circuit prevents proper solenoid operation, causing the cylinder to remain active or deactivated incorrectly, leading to performance issues and potential engine damage.
01. Most Common Causes
- Faulty cylinder deactivation solenoid for cylinder 12
- Open or shorted wiring in the solenoid circuit
- Corroded or damaged connector at the solenoid
- Engine control module (ECM) failure
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or misfire
- Reduced fuel economy
- Engine vibration or hesitation
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect wiring and connector for cylinder 12 deactivation solenoid for damage or corrosion.
Step 3: Test solenoid resistance with a multimeter; compare to specs (typically 10-30 ohms).
Step 4: Check for voltage and ground at solenoid connector with ignition on; repair open/short as needed.
Step 5: If wiring and solenoid are good, test ECM output or replace ECM.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with this code can cause misfires, reduced fuel economy, and potential catalytic converter damage. Have it diagnosed promptly.
How much does it cost to fix?▼
Repair costs range from $200 to $600, depending on the cause. A solenoid replacement is typically $150-$300, while wiring repairs or ECM replacement can be higher.