P0664 Intake Manifold Tuning Valve Control Circuit Low (Bank 2)

P0664 points to a low condition in the intake manifold tuning valve control circuit on Bank 2. The Bank 2 control voltage or feedback is below expected range.

Code details

Generic OBD-II · P0

System: Computer
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace manifold hardware before isolating the Bank 2 low control circuit fault.

Symptoms of P0664

Check-engine light, sometimes with several unrelated codes at once.
Warning lights, a no-start, or intermittent electrical faults.
Communication or module-reset problems on a scan tool.

Common causes of P0664

Low battery voltage, poor grounds, corroded connectors, or blown fuses.
Wiring or network (CAN bus) faults between modules.
A module software/programming issue, or rarely a failed controller.

Useful checks before replacing parts

Check Bank 2 tuning valve command, control voltage, current draw, fuse feed, ground or driver control, freeze-frame RPM, and manifold pressure response.
Inspect for short-to-ground faults, open power feed, failed actuator or solenoid windings, connector corrosion, linkage binding, and harness damage.
Command the valve while measuring the circuit and confirming Bank 2 runner movement.

Related OBD-II codes

These nearby computer entries can help compare wording and pin down the fault area.