Cylinder 6 Deactivation/Intake Valve Control Circuit High
The P3444 code indicates that the powertrain control module (PCM) has detected a high voltage condition in the intake valve control circuit for cylinder 6. This circuit is part of the cylinder deactivation system (also known as Active Fuel Management or Displacement on Demand) that shuts down cylinders to improve fuel economy. A high voltage reading typically points to a short to power, a faulty actuator, or a wiring issue. This can prevent the cylinder from deactivating properly, leading to performance problems and potential engine damage if ignored.
01. Most Common Causes
- Short to voltage in the intake valve control solenoid circuit for cylinder 6
- Faulty cylinder deactivation solenoid (intake valve actuator)
- Damaged wiring or connector at the solenoid or PCM
- Internal PCM failure (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 P3444 returns.
Step 2: Visually inspect the wiring and connector at the cylinder 6 deactivation solenoid for damage, corrosion, or loose pins.
Step 3: Measure voltage at the solenoid connector with the ignition on. Compare to manufacturer specifications (typically 12V or 5V reference).
Step 4: Test the solenoid resistance with a multimeter. Compare to specs (usually 20-30 ohms). Replace if out of range.
Step 5: If wiring and solenoid check out, suspect a PCM issue. Perform a PCM relay and ground check, or consult a professional for further diagnosis.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code. The high voltage condition can cause further damage to the PCM or solenoid, and the cylinder may not deactivate properly, leading to reduced fuel economy and potential engine misfire.
How much does it cost to fix?▼
The cost to fix P3444 typically ranges from $50 to $150 for diagnosis and repair. If the solenoid needs replacement, parts cost around $30-$80, and labor adds $50-$100. PCM replacement is more expensive ($500-$1000) but rarely needed.