Cylinder 6 Deactivation/Intake Valve Control Circuit Low
The P3443 code indicates a low voltage condition in the circuit that controls the cylinder deactivation or intake valve control for cylinder 6. This system is typically found in engines with Active Fuel Management (AFM) or Variable Valve Timing (VVT). The low circuit condition can be caused by a faulty solenoid, wiring issues, or a poor electrical connection. When this code sets, the engine control module (ECM) disables cylinder deactivation and may trigger the check engine light.
01. Most Common Causes
- Faulty cylinder 6 deactivation/intake valve control solenoid
- Open or shorted wiring in the solenoid circuit
- Poor electrical connection at the solenoid or ECM
- Corroded or damaged connector pins
- Failed ECM (rare)
02. Symptoms You Will Notice
- Check engine light illuminated
- Reduced fuel economy
- Engine misfire or rough idle
- Loss of power or hesitation
- Cylinder deactivation system disabled
03. Step-by-Step Diagnosis
Step 1: Scan the vehicle for codes and record freeze frame data.
Step 2: Visually inspect the wiring and connector for cylinder 6 deactivation solenoid for damage, corrosion, or loose connections.
Step 3: Test the solenoid resistance with a multimeter; compare to manufacturer specifications (typically 20-30 ohms).
Step 4: Check for voltage and ground at the solenoid connector with the engine running; should see battery voltage and a good ground.
Step 5: If wiring and solenoid check out, test the ECM output circuit for continuity and proper voltage.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe to drive short distances, but the vehicle may experience reduced fuel economy and performance. Prolonged driving could lead to catalytic converter damage if misfiring occurs.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on the cause. Replacing a solenoid can cost $100-$200 including labor.