HomeTrouble CodesP3443

P3443 — Cylinder 6 Deactivationintake Valve Control Circuit Low

Manufacturer-specificPowertrain (engine & transmission)

This code indicates the engine control module has detected a voltage reading below the expected range in the control circuit for the cylinder 6 intake valve deactivation solenoid. This system typically uses oil pressure to disable specific cylinders for fuel economy, and a circuit low condition prevents proper operation. The fault suggests an electrical short or component failure within that specific cylinder's valve control system.

Symptoms

What causes it — most likely first

1. Faulty Deactivation Solenoid

The solenoid coil internal resistance is too low or shorted, triggering the circuit low condition.

2. Damaged Wiring Harness

Wires leading to the solenoid are chafed, broken, or shorted to ground.

3. Poor Electrical Connection

Corrosion or loose pins at the solenoid connector disrupt voltage signals.

4. Excessive Engine Sludge

Contaminated oil can cause the solenoid to stick or fail electrically over time.

5. Failed Engine Control Module (PCM)

Internal driver failure within the computer is possible but statistically rare compared to component failure.

How it's diagnosed

  1. Inspect the cylinder 6 deactivation solenoid connector for corrosion, damage, or loose pins.
  2. Measure solenoid coil resistance with a multimeter and compare against manufacturer specifications.
  3. Check wiring continuity between the solenoid connector and the PCM harness for shorts or opens.
  4. Verify engine oil level and condition, as low pressure can affect variable valve timing systems.
  5. Clear codes and perform a test drive to see if the code returns immediately.
  6. Swap the solenoid with another cylinder if applicable to see if the code follows the component.

Code facts & related codes

SystemPowertrain (engine & transmission)
StandardizationManufacturer-specific (P1/B1/C1/U1)

Frequently asked

Will this code go away on its own?

No, this indicates a hard electrical fault that requires repair to clear.

Do I need to replace the engine computer for this code?

Rarely. Most cases are caused by the solenoid or wiring, and PCM replacement is usually unnecessary.

Can I drive with this code?

Short-term driving is possible, but fuel economy will suffer and long-term engine wear may increase.

Does an oil change fix this?

Only if the issue is solely due to sludge blocking the solenoid, but electrical faults require component repair.