AutoCodes – Infiniti – C1166 Infiniti

C1166 Infiniti Code - Suction Valve 1

Quick Answer

The Suction Valve supplies the brake fluid from the master cylinder to the pump, when VDC/TCS is activated. Common causes include Faulty Anti-Lock Brake System (ABS) Actuator and Electric Unit (Control Unit), ABS Actuator and Electric Unit harness is open or shorted, ABS Actuator and Electric Unit 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: C1166 Infiniti indicates Suction Valve 1.
Common causes: Common causes include Faulty Anti-Lock Brake System (ABS) Actuator and Electric Unit (Control Unit), ABS Actuator and Electric Unit harness is open or shorted, ABS Actuator and Electric Unit 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 3,185

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 Aug 19, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1166 Infiniti Description

The Suction Valve supplies the brake fluid from the master cylinder to the pump, when VDC/TCS is activated. The Anti-Lock Brake System (ABS) Actuator and Electric Unit (Control Unit) monitors the Suction Valve. ABS Actuator and Electric Unit sets the OBDII code when the Suction Valve is not to factory specifications.

OBDII Code C1166 Infiniti - Suction Valve 1 - AutoCodes.com — C1166 Infiniti Code - Suction Valve 1

What does this mean?

What are the Possible Causes of the DTC C1166 Infiniti?

Faulty Anti-Lock Brake System (ABS) Actuator and Electric Unit (Control Unit)
ABS Actuator and Electric Unit harness is open or shorted
ABS Actuator and Electric Unit circuit poor electrical connection

How to Fix the DTC C1166 Infiniti?

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 C1166 Infiniti 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.

Need more information about the C1166 Infiniti code?

Need more information on how to fix the C1166 Infiniti code? Get Access to Factory Service Manuals

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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 C1166 Infiniti Code

1. What does OBDII code C1166 for Infiniti indicate?

The C1166 code specifically refers to an issue with Suction Valve 1 in the vehicle's braking system.

2. What are the common symptoms of a C1166 Infiniti code?

Common symptoms include the ABS warning light illuminating on the dashboard, potential loss of ABS functionality, and unusual brake pedal behaviors.

3. What are the possible causes of OBDII code C1166 in an Infiniti?

Potential causes include a malfunctioning suction valve, wiring or electrical problems, a faulty ABS control module, or issues with the brake fluid pressure sensor.

4. How can I diagnose the C1166 code in my Infiniti?

Diagnosing the C1166 code typically involves using a professional OBDII scanner to retrieve the specific fault codes, inspecting the ABS system components, and conducting a thorough visual inspection for any visible damage.

5. Can I still drive my Infiniti with a C1166 fault code?

It is not recommended to drive your vehicle with an active C1166 fault code, as it may compromise the effectiveness of the ABS system and potentially impact braking performance.

6. How can I repair OBDII code C1166 related to Suction Valve 1 in my Infiniti?

Repairing the C1166 code often involves replacing the faulty suction valve, addressing any wiring issues, resetting the fault codes, and conducting a thorough test drive to ensure proper functionality.

7. Are there any DIY tips for fixing a C1166 Infiniti code?

While some aspects of diagnosing and repairing the C1166 code can be done by DIY enthusiasts, it is recommended to consult with a professional mechanic or automotive technician for accurate diagnosis and proper repairs.

8. How much does it typically cost to fix the C1166 OBDII code in an Infiniti?

The cost of repairing a C1166 code can vary depending on the specific cause of the issue, the parts needed for replacement, and the labor rates of the repair shop. It is advisable to obtain multiple quotes from different mechanics.

9. Can a C1166 code in an Infiniti reset on its own?

In some cases, the C1166 code may reset on its own after a certain number of drive cycles if the underlying issue has been resolved. However, it is recommended to diagnose and repair the problem to prevent potential safety risks.

10. How important is it to address the C1166 Infiniti code promptly?

It is crucial to address the C1166 code promptly to ensure the proper functioning of the ABS system and maintain the overall safety and performance of your Infiniti vehicle. Delaying repairs may lead to further complications and safety hazards.