What Does P0661 Mean?
The PCM has detected a low voltage condition in the intake manifold tuning valve (IMTV) control circuit for bank 1. The IMTV adjusts the effective length of the intake runners to optimize airflow and torque at different RPM ranges. When this circuit reads low, the valve may be stuck closed, reducing mid-range torque. The driver may notice reduced power, poor acceleration in certain RPM bands, or a slight decrease in fuel economy.
Common Causes
35%
Short to ground in IMTV solenoid wiring harness
30%
Failed IMTV solenoid/actuator (internal short)
20%
Corroded or damaged connector at IMTV solenoid
10%
Faulty PCM driver circuit for IMTV
5%
Damaged ground wire or poor ground connection
Diagnostic Steps
1
Using freeze frame data, note the engine RPM and load conditions when the code set to understand operating context.
2
Disconnect the IMTV solenoid connector on bank 1 and measure solenoid resistance — typical spec is 20-40 ohms depending on manufacturer. An abnormally low reading indicates an internal short.
3
With the solenoid disconnected, use a multimeter to check for continuity between the control wire and chassis ground. Any continuity indicates a short to ground in the harness.
4
Inspect the IMTV solenoid connector for corrosion, water intrusion, pushed-back pins, or green/white oxidation on terminals. Clean or replace as needed.
5
Backprobe the PCM connector at the IMTV driver pin and command the solenoid on using a scan tool bidirectional control — verify the PCM outputs battery voltage. If no voltage output, the PCM driver may be damaged.
Estimated Repair Cost
$75 - $450
Parts + labor, varies by vehicle and location
The PCM has detected a low voltage condition in the intake manifold tuning valve (IMTV) control circuit for bank 1. The IMTV adjusts the effective length of the intake runners to optimize airflow and torque at different RPM ranges. When this circuit reads low, the valve may be stuck closed, reducing...
The most common cause of P0661 (Intake Manifold Tuning Valve Control Circuit Low (Bank 1)) is: Short to ground in IMTV solenoid wiring harness
Typical repair costs for P0661 range from $75 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Generally safe to continue driving. The vehicle may experience reduced torque in certain RPM ranges and slightly lower fuel economy. No immediate safety risk, but prolonged operation could cause carbon buildup in the intake due to altered airflow patterns.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0661 to identify the root cause.
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Quick Info
Category
Powertrain
System
Intake / Air Management
Difficulty
Type
Generic (SAE)
Recommended Tools
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