Cylinder 9 Deactivation/Intake Valve Control Circuit High
The P3468 code indicates that the powertrain control module (PCM) has detected a high voltage condition in the cylinder 9 deactivation/intake valve control circuit. This circuit is responsible for controlling the valve that deactivates the intake valve on cylinder 9 to improve fuel economy under light load conditions. A high voltage reading suggests a short to power, a faulty actuator, or an open circuit in the wiring or connector.
01. Most Common Causes
- Short to voltage in the wiring or connector of the cylinder 9 deactivation/intake valve control circuit
- Faulty cylinder 9 deactivation/intake valve actuator
- Open circuit or high resistance in the control circuit
- Corroded or damaged connector pins
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Engine misfire or rough idle
- Loss of power or hesitation during acceleration
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all stored codes and freeze frame data. Clear codes and test drive to see if P3468 returns.
Step 2: Visually inspect the wiring and connector for cylinder 9 deactivation/intake valve actuator for damage, corrosion, or loose connections.
Step 3: Use a multimeter to check for voltage at the actuator connector with the engine running. Compare to manufacturer specifications.
Step 4: Test the actuator resistance and operation using a scan tool bidirectional control or a lab scope.
Step 5: If circuit and actuator are good, suspect a PCM issue; perform PCM tests or reprogramming as needed.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause reduced fuel economy, engine misfire, and potential damage to the catalytic converter. Have the issue diagnosed and repaired promptly.
How much does it cost to fix?▼
The cost to fix P3468 typically ranges from $50 to $150 for diagnosis and simple repairs like cleaning connectors or replacing wiring. If the actuator or PCM needs replacement, costs can be higher.