AutoCodes – GMC – P0660 GMC

P0660 GMC Code - Intake Manifold Tuning Valve Solenoid Control Circuit

Quick Answer

An Intake Manifold Tuning (IMT) Valve is used to change the intake manifold plenum configuration. Common causes include Faulty Intake Manifold Tuning Valve, Intake Manifold Tuning Valve harness is open or shorted, Intake Manifold Tuning Valve circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0660 GMC indicates Intake Manifold Tuning Valve Solenoid Control Circuit.
Common causes: Common causes include Faulty Intake Manifold Tuning Valve, Intake Manifold Tuning Valve harness is open or shorted, Intake Manifold Tuning Valve circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 958

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 13, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0660 GMC Description

An Intake Manifold Tuning (IMT) Valve is used to change the intake manifold plenum configuration. When the IMT valve is open, the intake manifold is configured to one large plenum. When the IMT valve is closed, the intake manifold is configured to 2 smaller plenums. The IMT valve improves engine performance at low and high engine speeds depending on the engine load. The Diagnostic Trouble Code (DTC) will set when the control module detects that the state of the driver and the state of the circuit do not match. The control module will detect an open, short to ground on the variable tuning valve signal or an open or a short to ground on the ignition voltage circuit of the IMT valve solenoid for more than 6.25 seconds.

OBDII Code P0660 GMC - Intake Manifold Tuning Valve Solenoid Control Circuit - AutoCodes.com — P0660 GMC Code - Intake Manifold Tuning Valve Solenoid Control Circuit

What does this mean?

What are the Possible Causes of the DTC P0660 GMC?

Faulty Intake Manifold Tuning Valve
Intake Manifold Tuning Valve harness is open or shorted
Intake Manifold Tuning Valve circuit poor electrical connection

How to Fix the DTC P0660 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0660 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0660 GMC Code

1. What are the common symptoms of OBDII code P0660 GMC?

The common symptoms of OBDII code P0660 GMC include rough idling, poor engine performance, and a noticeable decrease in fuel efficiency.

2. What does the OBDII code P0660 GMC indicate?

OBDII code P0660 GMC indicates a fault in the intake manifold tuning valve solenoid control circuit.

3. What are the possible causes of OBDII code P0660 GMC?

Possible causes of OBDII code P0660 GMC include a faulty intake manifold tuning valve solenoid, damaged wiring or connectors in the control circuit, or a problem with the Engine Control Module (ECM).

4. How can I diagnose the issue related to OBDII code P0660 GMC?

Diagnosing the issue related to OBDII code P0660 GMC involves conducting a thorough inspection of the intake manifold tuning valve solenoid, checking the wiring and connectors for any damage, and using a diagnostic scanner to retrieve trouble codes and data from the ECM.

5. Can I drive my vehicle with OBDII code P0660 GMC?

It is not recommended to drive your vehicle with OBDII code P0660 GMC, as it can lead to further damage to the engine and decrease in performance.

6. How can I repair OBDII code P0660 GMC?

Repairing OBDII code P0660 GMC involves replacing the faulty intake manifold tuning valve solenoid, repairing any damaged wiring or connectors, and clearing the trouble code with a diagnostic scanner.

7. Is it necessary to reset the ECM after repairing OBDII code P0660 GMC?

Yes, it is necessary to reset the ECM after repairing OBDII code P0660 GMC to clear the fault code and ensure proper functioning of the vehicle.

8. How much does it cost to fix OBDII code P0660 GMC at a professional auto repair shop?

The cost to fix OBDII code P0660 GMC at a professional auto repair shop can vary depending on the extent of the damage and the labor rates in your area, but it typically ranges from $200 to $500.

9. Can a DIY enthusiast fix OBDII code P0660 GMC at home?

A DIY enthusiast with the necessary tools and knowledge about automotive repairs can potentially fix OBDII code P0660 GMC at home by following repair guides and tutorials, but it is recommended to seek professional help if unsure.

10. How can I prevent OBDII code P0660 GMC from occurring in the future?

To prevent OBDII code P0660 GMC from occurring in the future, it is important to perform regular maintenance on your vehicle, such as checking the intake manifold tuning valve solenoid and its control circuit for any signs of wear or damage.