P0660 — Intake Manifold Tuning Valve Control Circuit/Open #

Note: The wording for code P0660 may vary depending on the vehicle manufacturer. Below are some known variations:

• Intake Manifold Tuning Valve Control Circuit/Open (General, Ford, Mazda, GM, Hyundai, Kia)
• IMRC (Intake Manifold Runner Control) Solenoid Circuit/Open (Chrysler, Dodge, Jeep, Honda, Acura)
• Variable Intake Air System Control Circuit/Open (Nissan, Infiniti)
• Saugrohrklappensteuerung Stromkreis offen (VW, Audi, German brands)

Code P0660 overview #

The P0660 diagnostic trouble code (DTC) signals an issue with the Intake Manifold Tuning Valve (IMTV) Control Circuit. This system, sometimes called the Intake Manifold Runner Control (IMRC) or Variable Intake Air System, adjusts airflow inside the intake manifold to optimize engine performance across different RPM ranges. When the Engine Control Module (ECM)—also known as the Powertrain Control Module (PCM)—detects an open or faulty circuit in this valve’s control wiring, it triggers P0660. The result can be reduced power, rough running, or even engine warning lights. Most often, the issue is electrical, but sometimes it’s mechanical or related to connector corrosion.

Common symptoms for code P0660 #

When P0660 is active, drivers may notice a variety of symptoms. Some are subtle, while others can affect drivability. Here’s what to look for:

• Check Engine Light (MIL) illuminated on the dash
• Reduced engine power or sluggish acceleration, especially at certain RPMs
• Rough idle or hesitation during throttle input
• Decreased fuel efficiency
• Possible engine misfire codes stored alongside P0660
• Intake manifold tuning valve actuator noise (in some cases, clicking or rattling)

Probable causes for code P0660 (in order of likelihood) #

The P0660 code is typically the result of an electrical fault, but several root causes are possible. Here’s what most frequently triggers this DTC:

1. Faulty Intake Manifold Tuning Valve (IMTV) solenoid or actuator
2. Open circuit in IMTV wiring harness (damaged, frayed, or corroded wires)
3. Poor electrical connection at the IMTV connector (corrosion, loose pins)
4. Failed IMTV relay (if equipped)
5. ECM/PCM malfunction (rare, but possible)

Step-by-step diagnosis for code P0660 #

Diagnosing P0660 requires a methodical approach, combining visual inspection with electrical testing. Here’s a proven step-by-step workflow:

• Scan for codes: Record all DTCs and freeze frame data using an OBD-II/EOBD scanner.
• Visual inspection: Check the IMTV actuator, solenoid, and wiring harness for obvious damage, loose connectors, or corrosion.
• Check the connector: Disconnect the IMTV plug and inspect for bent, broken, or corroded pins.
• Test the circuit: Using a digital multimeter, measure voltage and continuity between the IMTV connector and the ECM/PCM. Look for open circuits or shorts to ground.
• Actuator test: If possible, use scan tool bi-directional controls to command the IMTV open/close. Listen for actuator movement or clicking.
• Relay and fuse check: If your vehicle uses a relay or fuse for the IMTV, verify both are functional.
• Check ECM/PCM output: If all other components test good, inspect the ECM/PCM’s control output to the IMTV (consult OEM wiring diagrams for details).

Possible repairs for code P0660 #

The right repair for P0660 depends entirely on the cause found during diagnosis. Here are the most common fixes, matched to their root causes:

• Replace faulty IMTV actuator or solenoid if it fails resistance or movement tests
• Repair or replace damaged wiring (repair open, shorted, or corroded wires in the IMTV circuit)
• Clean and secure electrical connectors (remove corrosion, tighten loose pins, apply dielectric grease)
• Replace failed IMTV relay or blown fuse (if equipped)
• Update or reprogram ECM/PCM if a known software issue exists (rare)
• Replace ECM/PCM only as a last resort, and only after all other tests confirm the module is at fault

Is it safe to drive with code P0660? #

Limited: Most vehicles can be driven with P0660 for short distances, as it rarely causes immediate engine damage. However, you may notice reduced performance, hesitation, or increased fuel consumption. If the check engine light is flashing, or if you experience severe drivability issues, it’s best to avoid driving and seek repairs promptly. Prolonged neglect of intake runner control faults can lead to further engine problems or emissions failures.

Vehicles most frequently affected by code P0660 #

While P0660 can appear in vehicles from nearly every manufacturer, it’s most often reported in models using electronically controlled intake manifolds. The following makes and models are commonly affected:

• Ford (Fusion, Focus, Escape, Explorer, F-150)
• Mazda (Mazda6, Mazda3, CX-7, Tribute)
• GM (Chevrolet Malibu, Impala, Equinox, Silverado)
• Hyundai (Sonata, Elantra, Santa Fe)
• Kia (Optima, Sorento, Forte)
• Chrysler/Dodge/Jeep (Charger, 300, Grand Cherokee)
• Honda/Acura (Accord, Odyssey, MDX)
• Nissan/Infiniti (Altima, Maxima, Murano, G35)

Common mistakes and best practices for code P0660 #

It’s easy to jump to conclusions with P0660, but hasty repairs can waste time and money. Here’s what to watch out for, and how to get it right:

• Don’t replace the intake manifold or ECM/PCM without confirming the fault: Most issues are wiring or connector related.
• Always inspect the wiring harness thoroughly: Many P0660 cases are due to simple harness damage or corrosion, especially in high-heat or moisture-prone areas.
• Use OEM wiring diagrams: These will help you trace the circuit accurately for your specific vehicle.
• Check for technical service bulletins (TSBs): Some manufacturers have known fixes for recurring P0660 issues.

Quick FAQ for code P0660 #

Q: Can a dirty intake manifold cause P0660?
A: Not directly. P0660 is triggered by an electrical fault in the control circuit, not by manifold deposits. However, excessive carbon buildup can sometimes cause actuator binding, which may contribute to the fault if it overloads the circuit.

Q: Will erasing the code fix my problem?
A: No. Clearing the code with a scanner will turn off the check engine light temporarily, but unless the underlying issue is fixed, P0660 will return as soon as the fault is detected again.

Q: Is P0660 covered under warranty?
A: If your vehicle is within the manufacturer’s powertrain warranty, and the cause is a failed OEM part, P0660 repairs may be covered. Always check with your dealer or authorized repairer for eligibility.