P0665 Intake Manifold Tuning Valve Control Circuit High (Bank 2)

P0665 indicates a high condition in the intake manifold tuning valve control circuit on Bank 2. The controller sees Bank 2 control voltage or feedback above the 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 condemn the controller before checking Bank 2 tuning valve wiring, ground path, and actuator movement.

Symptoms of P0665

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 P0665

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

Review Bank 2 tuning valve command, control voltage, driver status, manifold pressure response, freeze-frame load, and related high-input codes.
Inspect for short-to-voltage faults, open grounds, stuck relays or solenoids, connector corrosion, linkage binding, and harness damage near heat.
Command the valve and verify whether voltage, current, and physical Bank 2 runner movement change correctly.

Related OBD-II codes

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