What Does P0660 Mean?
The intake manifold tuning valve (IMTV) control circuit for Bank 1 has an open circuit or general electrical malfunction. Unlike P065E which indicates a performance issue, this code specifically identifies an electrical fault in the solenoid or actuator control circuit. The valve will default to one position and cannot be controlled by the ECM. The driver may notice a slight reduction in power at certain RPM ranges.
Common Causes
30%
Open circuit in the IMTV solenoid control wiring (broken wire, disconnected connector)
25%
Failed IMTV solenoid (open coil winding)
20%
Corroded or backed-out pins in the IMTV solenoid connector
15%
ECM internal driver failure for the IMTV control output
10%
Blown fuse or relay feeding the IMTV circuit
Diagnostic Steps
1
Locate the IMTV solenoid on Bank 1 of the intake manifold. Inspect the connector for damage, corrosion, backed-out pins, or disconnection. Reconnect if loose and clear codes.
2
Disconnect the IMTV solenoid connector and measure coil resistance across the solenoid terminals. Typical range is 8-30 ohms (check service manual for exact specification). An open reading (OL/infinity) confirms a failed solenoid coil.
3
With the solenoid disconnected, check for 12V power supply on the feed wire with key on. Also verify the ECM is providing the ground-side control signal by back-probing with a test light or multimeter.
4
If power and ground are present at the connector but the solenoid is good, check for high resistance in the wiring. Measure resistance from the ECM connector to the solenoid connector on both the power and ground wires — each should be less than 1 ohm.
5
If the ECM is not providing the ground-side control signal, use bidirectional scan tool control to command the IMTV. If the ECM driver does not respond, the ECM output transistor has failed.
Estimated Repair Cost
$75 - $500
Parts + labor, varies by vehicle and location
The intake manifold tuning valve (IMTV) control circuit for Bank 1 has an open circuit or general electrical malfunction. Unlike P065E which indicates a performance issue, this code specifically identifies an electrical fault in the solenoid or actuator control circuit. The valve will default to one...
The most common cause of P0660 (Intake Manifold Tuning Valve Control Circuit/Open Bank 1) is: Open circuit in the IMTV solenoid control wiring (broken wire, disconnected connector)
Typical repair costs for P0660 range from $75 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive. The IMTV will default to one position, slightly reducing engine efficiency at certain RPM ranges. No danger of engine damage. Repair at your convenience to restore full performance.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0660 to identify the root cause.
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Quick Info
Category
Powertrain
System
Intake Manifold / Air Induction
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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