OBD-II Code
P0661
Severity
Not yet reviewed
Nobody on our side has assessed this code yet, so we are not going to guess at how serious it is.
Can you drive it
We cannot say
Treat it as unknown until a shop reads it with live data. If the check-engine light is FLASHING, stop driving as soon as it is safe to — that means an active misfire, whatever the code.
Indicative cost (USD)
$30–$750
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
$30 (lubricant + linkage clip on a Ford 3.0) to $750 (full intake manifold + actuator on a GM 3.6).
P0661 sets when the PCM commands the Intake Manifold Tuning Valve (IMRC, also called IMT or IMC depending on the OEM) actuator on bank 1 and the driver circuit reads a voltage lower than expected — typically below 1V on a circuit that should be pulling toward 12V when commanded off, indicating a short to ground or an open in the high side of the driver.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then follow the diagnostic notes further down this page, in the order they are written.
They are written in the order a shop works this code, cheapest checks first. Where they name a component, inspect its wiring and connector before replacing it.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
Read the full diagnostic procedureP0661 sets when the PCM commands the Intake Manifold Tuning Valve (IMRC, also called IMT or IMC depending on the OEM) actuator on bank 1 and the driv…
P0661 sets when the PCM commands the Intake Manifold Tuning Valve (IMRC, also called IMT or IMC depending on the OEM) actuator on bank 1 and the driver circuit reads a voltage lower than expected — typically below 1V on a circuit that should be pulling toward 12V when commanded off, indicating a short to ground or an open in the high side of the driver. The IMRC is the linkage/butterfly arrangement that switches the intake runners between long-runner (low-RPM torque) and short-runner (high-RPM breathing) configurations.
Cheapest-first ladder
- Visual the IMRC actuator linkage and the runner butterflies — carbon buildup or a broken plastic linkage arm physically jamming the system is the #1 cause and a $30 lubricant or $80 linkage clip handles it.
- Backprobe the IMRC actuator connector with engine off, key on, scan tool commanding the actuator — should see 0V command (driver pulled low) cycling to 12V with each command pulse, and actuator current should sit between 0.3-1.5A during a sweep; a stuck linkage shows current spiking above 2A.
- Resistance-check the actuator solenoid coil (typically 8-16 ohms cold) and check for short to ground at the connector. Target thresholds: 0-100% commanded position should track within 5% of actual position feedback (on platforms with a position sensor), actuator current 0.3-1.5A in normal sweep. Expensive-misdiagnosis caveat: a seized IMRC linkage from carbon buildup looks identical to a failed actuator on the scan tool, but lubricating the pivots and walnut-blasting the runners is a $200 service vs. a $400-700 intake-manifold replacement on platforms where the IMRC is integrated.
Vehicle-specific patterns2003-2007 Ford Escape/Mazda Tribute/Mariner with the 3.0L Duratec V6 is the canonical P0661 vehicle — the IMRC linkage clip breaks and the butterfly…
- 2003-2007Ford Escape/Mazda Tribute/Mariner with the 3.0L Duratec V6 is the canonical P0661 vehicle — the IMRC linkage clip breaks and the butterfly hangs in mid-travel, $15 clip fix that Ford TSB'd.
- 2004-2013Mazda 3/5/6 with the MZR 2.3L/2.5L throws P0661 from carbon buildup on the IMRC shaft causing it to stick, especially in high-mileage stop-and-go vehicles.
- 2010-2017GM 3.6L LFX/LLT V6 (Camaro, CTS, Equinox, Traverse) throws P0661 from a failed IMRC solenoid on the front of the intake manifold or from a torn diaphragm in the vacuum-actuated runner controller depending on year.
- 2011-2018Hyundai Sonata/Tucson/Santa Fe with the Theta II 2.4L GDI throws P0661 from carbon-coked IMRC runners — the GDI carbon problem accumulates on the IMRC butterflies and binds them.
Estimated repair$30 (lubricant + linkage clip on a Ford 3.0) to $750 (full intake manifold + actuator on a GM 3.6).
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