P0665Generic code

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

The P0665 code means the computer sees high voltage in the bank 2 variable intake valve control circuit, from an open circuit or a short to voltage. It can cause a slight loss of power at certain engine speeds. Check the connector and wiring first.

Severity
Low
Can I keep driving?
Yes, no immediate risk
Estimated cost
$40 to $600
Difficulty
Medium
System
Air and Fuel
Applies to
All OBD2 vehicles

Updated Reviewed by Renzo Chacca

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What the P0665 code means

This is the same as the bank 1 valve, but on the side opposite cylinder 1 on V engines.

The computer watches the control circuit from its own driver transistor. The P0665 code flags high voltage in that control circuit, either an open circuit or a short to voltage. Before you replace the component, check the fuse, relay, connector and wiring, which are the most common causes.

If it fails, one bank works with the valve in a fixed position, which means a slight loss of power.

To confirm the fault, measure the continuity of each wire between the component connector and the computer connector with the key off. It should be under 1 ohm, and an infinite reading means the wire is open. If the wiring is good, measure the component itself: infinite resistance confirms it is open inside.

P0665 code symptoms

  • Check engine light or another warning light on.
  • Loss of torque at certain rpm.
  • Less power in some rpm ranges.

Likely causes of the P0665 code

  1. Loose or broken connector. The most frequent cause, especially after another repair.
  2. Open coil or motor. Infinite resistance.
  3. Control wire cut between the component and the computer.
  4. Short to 12 volts. The control wire touches another wire that carries voltage.

How to diagnose the P0665 code step by step

  1. Activate the component with the scan tool and check whether it responds.
  2. Check the fuse and relay. Measure the voltage on both sides of the fuse, and swap the relay with an identical one.
  3. Measure the supply at the connector. You should see battery voltage with the key on or when the component is activated.
  4. Measure the resistance of the component and compare it with the manual. Also check the insulation to ground.
  5. Check the control wire for continuity to the computer and for shorts.

How to fix the P0665 code

  • Repair the connector, the wiring or the power supply.
  • Replace the bank 2 variable intake valve if it does not respond even with correct power and command signals.
  • Clear the codes and verify the repair.

Technical reference data

  • Electric or vacuum actuator.
  • Reference values: check the manufacturer data for your vehicle.

Brand-specific notes

This code shows up on V engines, where there is a valve for each bank.

P0665 on Ford V6 and V8 Engines

It appears on Ford V6 and V8 engines.

P0665 on Mazda V6 and V8 Engines

It appears on Mazda V6 and V8 engines.

P0665 on GM V6 and V8 Engines

It appears on GM V6 and V8 engines.

Frequently asked questions about P0665

Can I drive with a P0665 code?
Yes, with caution. The engine runs, but one bank works with the valve in a fixed position, so you may notice a slight loss of power.
What does the bank 2 variable intake valve do?
It works like the bank 1 valve, but on the side opposite cylinder 1 on V engines.
Do I always have to replace the part?
No. Check the fuses, relays, connectors and wiring first, because they are the most common cause.
How much does it cost to fix P0665?
As a rough guide, between $40 and $600. A connector or wiring repair is at the low end, and a new valve is at the high end.
What does the P0665 code mean?
It is a generic OBD2 code that means the computer sees high voltage in the bank 2 intake manifold tuning valve control circuit.
What is the most common cause of P0665?
A loose or broken connector, especially after another repair was done nearby. A P0665 code can also come from an open coil or a cut control wire.

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Questions about the P0665 code

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