P0664Intake Manifold Tuning Valve Control Circuit Low Bank 2
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- Check engine light (depending on the maker)
- Loss of power in part of the rev range
- Actuator does not click when switching
- Likely causes
- LikelyBank 2 control wire shorted to ground
- PossibleBank 2 actuator shorted internally to ground
- PossibleOpen circuit (included with GM-style logic)
- RareOutput driver in the engine module faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €20 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.