Powertrain, generic · Computer and auxiliary outputs

P0661 Intake Manifold Tuning Valve Control Circuit Low Bank 1

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

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.

Likely causes

Low-side control wire shorted to ground by chafing on engine or manifold

Actuator shorted internally to housing or ground

Open circuit (connector, coil) – included under P0661 at GM

Output driver in the engine module faulty

Symptoms

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

Repair estimate

DifficultyEasyDIY possible

Parts and labour€20–350

Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

intake manifold tuning valvevalve actuatoractuator wiring

Related codes

P0660 P0662 P0664 P065E P2071

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com.