P0661Intake Manifold Tuning Valve Control Circuit Low Bank 1
- 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). P0661 means the bank 1 control circuit voltage is too low with the driver off – a short to ground (0.5 Ω or less), which bypasses the driver and keeps the valve energised; GM also includes an open circuit (200 kΩ or more) here, so P0660 may set alongside. GM's engines with this valve (low-side driver) check with ignition voltage of at least 11 V and the engine above 400 rpm and set the code after 40 of 50 samples (about 0.6 s), with the check engine light after two trips. Ford does not use P0661.
- What you may notice
- Check engine light after two trips (GM)
- Torque or power gap in one rev band
- Possibly blown fuse, further codes of the same supply circuit
- Likely causes
- LikelyLow-side control wire shorted to ground by chafing on engine or manifold
- PossibleActuator shorted internally to housing or ground
- PossibleOpen circuit (connector, coil) – included under P0661 at GM
- 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.