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Engine-Codes – Infiniti – P1111 Infiniti

P1111 Infiniti Code - Intake Valve Timing Control Solenoid Valve Circuit Bank 1

Quick Answer

The P1111 Infiniti code refers to a fault with the Intake Valve Timing Control Solenoid Valve Circuit in Bank 1. Common causes include Faulty intake valve timing control solenoid valve: The solenoid valve may be defective or worn out, causing it to malfunction, Wiring issues: Poor electrical connections or damaged wiring in the solenoid valve circuit can trigger this code, Clogged oil passages: Accumulated debris or sludge in the oil passages can restrict oil flow to the solenoid valve. 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
P1111 Infiniti indicates Intake Valve Timing Control Solenoid Valve Circuit Bank 1.
Common causes
Common causes include Faulty intake valve timing control solenoid valve: The solenoid valve may be defective or worn out, causing it to malfunction, Wiring issues: Poor electrical connections or damaged wiring in the solenoid valve circuit can trigger this code, Clogged oil passages: Accumulated debris or sludge in the oil passages can restrict oil flow to the solenoid valve.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code P1111 Infiniti Description

The P1111 Infiniti code refers to a fault with the Intake Valve Timing Control Solenoid Valve Circuit in Bank 1. This code indicates that there is an issue with the solenoid valve that controls the intake valve timing in the engine. The intake valve timing control system is crucial for optimizing engine performance, fuel efficiency, and emissions. When the solenoid valve fails or malfunctions, it can lead to various problems with the engine's operation.

OBDII Code P1111 Infiniti - Intake Valve Timing Control Solenoid Valve Circuit Bank 1
P1111 Infiniti Code - Intake Valve Timing Control Solenoid Valve Circuit Bank 1

Common Causes of P1111 Infiniti

  1. Faulty intake valve timing control solenoid valve: The solenoid valve may be defective or worn out, causing it to malfunction.
  2. Wiring issues: Poor electrical connections or damaged wiring in the solenoid valve circuit can trigger this code.
  3. Clogged oil passages: Accumulated debris or sludge in the oil passages can restrict oil flow to the solenoid valve.
  4. Engine oil issues: Low oil level or poor quality oil can affect the solenoid valve's operation.

Symptoms of P1111 Infiniti

  1. Rough idling: The engine may idle roughly or inconsistently due to improper intake valve timing control.
  2. Decreased acceleration: The vehicle may experience a loss of power or sluggish acceleration when driving.
  3. Poor fuel economy: A malfunctioning intake valve timing control solenoid can lead to decreased fuel efficiency.
  4. Engine misfires: The engine may misfire or run unevenly, causing vibrations and performance issues.

How to Fix P1111 Infiniti

  1. Diagnose the issue: Use a scan tool to retrieve the P1111 code and perform a thorough inspection of the intake valve timing control solenoid valve circuit.
  2. Replace the solenoid valve: If the solenoid valve is faulty, replace it with a new unit to restore proper operation.
  3. Check wiring and connections: Inspect the wiring harness and connectors for any damage or corrosion, repairing or replacing as necessary.
  4. Clean oil passages: Flush the oil passages to remove any debris or sludge that may be obstructing oil flow to the solenoid valve.
  5. Test and reset: After completing the repairs, test the system to ensure proper operation and reset the fault code using a scan tool.

Cost to Fix P1111 Infiniti

The cost of repairing a P1111 code related to the intake valve timing control solenoid valve circuit can vary depending on the extent of the issue and the labor rates at the auto repair shop. Typically, the cost of a new intake valve timing control solenoid valve ranges from $100 to $300, depending on the vehicle make and model. Labor costs for this repair can range from $100 to $300, with total repair costs averaging between $200 and $600.

What does this mean?

Tech Notes for P1111 Infiniti

Since the Intake valve timing control solenoid valve uses oil flow to control timing, dirty oil can cause the valve to stuck open or close. Before replacing the valve, change the engine oil and filter and reset the engine code. If the code comes back you can remove the Intake valve timing control solenoid and clean it with brake cleaner.

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Information for Specific Infiniti Models

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.

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