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P0664 – Intake Manifold Tuning Valve Control Circuit Low (Bank 2) (OBD2)

P0664 means "Intake Manifold Tuning Valve Control Circuit Low (Bank 2)". The voltage the control unit measures in the intake manifold tuning valve circuit is below the permitted minimum. For a sensor this usually means the signal wire is shorted to ground or the reference voltage is missing; for an actuator, that its control wire is shorted to ground.

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P0664 quick summary

Fault codeP0664
MeaningIntake Manifold Tuning Valve Control Circuit Low (Bank 2)
SystemPowertrain (Engine & Transmission)
VehiclesGeneric OBD2
SeverityLow
Can I drive?Yes. You may notice slightly less power at certain engine speeds.
Repair cost€20 – €600

How the intake manifold tuning valve works

The intake manifold tuning valve changes the length or path of the intake runners to improve torque at low rpm and power at high rpm; these codes cover its control circuit.

Many petrol engines have a variable intake manifold: a flap or valve switches between long runners (more torque at low rpm) and short runners (more power at high rpm). It is operated by a vacuum actuator controlled by a solenoid, or by an electric motor with a position sensor.

Codes P0660–P0665 report open, low or high faults in the tuning valve control circuit for bank 1 and bank 2. If the valve does not switch, the engine loses some torque or top-end power, but usually runs normally otherwise.

Typical causes are a failed solenoid, cracked vacuum hoses, a sticking flap or broken linkage, and wiring problems.

Bank 2 is the cylinder row that does NOT contain cylinder 1, so this code only appears on V6, V8, V10, V12 and boxer engines.

On VAG vehicles (VW, Audi, Škoda, Seat, Cupra), VCDS and older VAG testers can show this code as the five-digit VAG code 17048 (P0664). Both numbers mean the same fault.

Symptoms of P0664

  • Check Engine light on
  • Reduced power at low or high rpm
  • Rattle from the intake (broken linkage)
  • Slightly higher fuel consumption
  • Often no noticeable symptoms

Most common causes of P0664 (most likely first)

Mechanic's Pro Tip

On many engines the plastic linkage of the intake flaps breaks long before the actuator fails – look at the linkage before buying a new actuator.

  1. 1.Signal or control wire shorted to ground

    Most likely

    Look for chafed insulation where the harness touches the engine, exhaust brackets or body edges.

  2. 2.Missing 5 V reference or supply voltage

    An open reference wire or a shorted sensor elsewhere on the same reference circuit can pull it down.

  3. 3.Internal short in the intake manifold tuning valve

  4. 4.Failed tuning valve solenoid or actuator

  5. 5.Cracked vacuum hose

  6. 6.Sticking flap or broken linkage

  7. 7.Wiring or connector fault

Step-by-step diagnostic guide

  1. 1

    Read codes

    Read all codes and note which bank is affected.

  2. 2

    Measure the signal voltage

    With the ignition on and the intake manifold tuning valve plugged in, back-probe the signal wire. Then unplug it and check the reference/supply and ground wires separately.

    Multimeter: Signal near 0 V = short to ground or no reference. Reference wire: about 5 V with ignition on. Signal wire to ground with connector unplugged: no continuity.

  3. 3

    Command the valve

    Use the scan tool to switch the valve and watch or listen for movement.

  4. 4

    Check vacuum and solenoid

    Check the vacuum supply and hoses; measure the solenoid resistance.

    Multimeter: Many tuning valve solenoids read about 20–40 Ω; check the specification.

  5. 5

    Check the linkage

    Check that the flap moves freely and the linkage is intact.

  6. 6

    Repair and verify

    Replace the faulty part and clear the codes.

Frequently asked questions

Can I keep driving with P0664?

Yes. You may notice slightly less power at certain engine speeds.

How much does it cost to fix P0664?

Typical repair costs are 20 € – 600 €, depending on the cause and the vehicle. The most common fixes are: signal or control wire shorted to ground; missing 5 V reference or supply voltage; internal short in the intake manifold tuning valve. Always confirm the cause with the tests above before buying parts.

Is an intake manifold tuning valve code serious?

Usually not; the engine loses some performance but runs normally.

Is it the same as swirl flaps?

Similar but not the same: tuning valves change the runner length, swirl flaps change the air flow pattern in the cylinder. Some engines have both.

What is the difference between P0664 and similar codes?

P0664 belongs to a group of codes for the same component that differ in the type or location of the fault: P0661 – Intake Manifold Tuning Valve Control Circuit Low (Bank 1); P0662 – Intake Manifold Tuning Valve Control Circuit High (Bank 1); P0663 – Intake Manifold Tuning Valve Control Circuit (Bank 2); P0665 – Intake Manifold Tuning Valve Control Circuit High (Bank 2); P2004 – Intake Manifold Runner Control Stuck Open Bank 1; P2005 – Intake Manifold Runner Control Stuck Open Bank 2. The tests on this page apply to the whole group; the type of fault tells you where to start.

Related fault codes

This guide is for information only. Working on vehicles can be dangerous — if you are unsure, have the car checked by a qualified mechanic. Values can differ between model years; always check the manufacturer's repair information.