P0664: Intake Manifold Tuning Valve Control Circuit Low Bank 2

The intake manifold tuning valve switches the manifold length or plenum connection with engine speed (more torque low, more power high); it is not the runner or swirl flap (IMRC, P2004 ff). P0664 means the bank 2 control circuit voltage is too low with the driver off – typically a short to ground; with GM-style logic an open circuit is included. Bank 2 codes require a V-engine manifold with two separately switched valves; many V engines use a single central valve between the plenums, and no manufacturer document available to us uses this code, so the description follows bank 1. At GM the bank 1 equivalent (P0661) flags 0.5 Ω or less to ground in 40 of 50 samples, with the lamp after two trips.

Bank 2 is the side without cylinder 1, so it only exists on V or boxer engines.

Symptoms

• Check engine light (depending on the maker)
• Loss of power in part of the rev range
• Actuator does not click when switching

Most likely causes

• Bank 2 control wire shorted to ground
• Bank 2 actuator shorted internally to ground
• Open circuit (included with GM-style logic)
• Output driver in the engine module faulty

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the vacuum hoses and the connector
2. With the connector unplugged, check whether the signal wire is making contact with ground.
3. Watch the actuator's movement with the scanner
4. Inspect the manifold for carbon buildup
5. Replace the actuator if it does not follow the command

Good to know

• Repair difficulty: easy
• It affects emissions.

What each character of P0664 means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• 6: Control modules and outputs
• 64: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0664?

You can drive in moderation. Get it repaired soon, because a loose flap can cause major damage on some engines.

What causes code P0664?

The most common causes are: bank 2 control wire shorted to ground; bank 2 actuator shorted internally to ground; open circuit (included with GM-style logic).

Related codes

• P0661Intake Manifold Tuning Valve Control Circuit Low Bank 1
• P0663Intake Manifold Tuning Valve Control Circuit/Open Bank 2
• P0665Intake Manifold Tuning Valve Control Circuit High Bank 2
• P065FIntake Manifold Tuning Valve Performance Bank 2

Sources

• law.cornell.edu: 13 CCR 1968.2
• gsi.ext.gm.com: 18OBDG03A Engine Diagnostics

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.