AutoCodes – Cadillac – P0660 Cadillac

P0660 Cadillac 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 Cadillac 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 1,185

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

What does this mean?

What are the Possible Causes of the DTC P0660 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

1. What does the P0660 OBDII code for Cadillac indicate?

The P0660 code specifically points to a problem with the intake manifold tuning valve solenoid control circuit in a Cadillac vehicle.

2. What are some common symptoms of a P0660 fault in a Cadillac?

Common symptoms of a P0660 code include rough idling, reduced engine performance, poor fuel economy, and potential stalling of the vehicle.

3. What are the possible causes of the P0660 code in a Cadillac?

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

4. How can I diagnose the issue causing the P0660 code in my Cadillac?

Diagnosing the P0660 code typically involves performing a thorough visual inspection of the solenoid, checking the wiring and connectors for any damage, and using a multimeter to test the solenoid's resistance and continuity.

5. Can I still drive my Cadillac with a P0660 code present?

While it may be possible to drive the vehicle with a P0660 code, it is not recommended as it can lead to further damage and poor engine performance. It is best to address the issue promptly.

6. How can I repair the intake manifold tuning valve solenoid control circuit in my Cadillac?

Repairing the intake manifold tuning valve solenoid control circuit may involve replacing the solenoid, repairing or replacing damaged wiring and connectors, or reprogramming the ECM to address the issue.

7. Is it possible to reset the P0660 code in a Cadillac without fixing the underlying issue?

While clearing the code temporarily using an OBDII scanner is possible, the code is likely to reappear until the root cause of the problem is fixed.

8. Are there any preventive measures to avoid encountering the P0660 code in a Cadillac?

Regular maintenance, such as checking and cleaning the intake manifold components, inspecting wiring for damage, and addressing any engine performance issues promptly, can help prevent the occurrence of the P0660 code.

9. Can a DIY enthusiast tackle the repair of a P0660 code in a Cadillac?

Depending on the individual's skill level and access to tools, a DIY enthusiast may be able to diagnose and repair a P0660 code. However, it is recommended to consult a professional mechanic for accurate diagnosis and repair.

10. How much can I expect to pay for fixing a P0660 code in a Cadillac at a repair shop?

The cost of fixing a P0660 code in a Cadillac can vary depending on the extent of the issue, the labor rates of the repair shop, and the cost of parts needed. It is advisable to get a few quotes from reputable repair shops for an accurate estimate.