AutoCodes – Infiniti – P1111 Infiniti

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

Quick Answer

The intake valve timing control solenoid valve is activated by ON/OFF pulse duty (ratio) signals from the Engine Control Module (ECM). Common causes include Faulty Intake Valve Timing Control Solenoid Valve Bank 1, Intake Valve Timing Control Solenoid Valve Bank 1 harness is open or shorted, Intake Valve Timing Control Solenoid Valve Bank 1 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: P1111 Infiniti indicates Intake Valve Timing Control Solenoid Valve Circuit Bank 1.
Common causes: Common causes include Faulty Intake Valve Timing Control Solenoid Valve Bank 1, Intake Valve Timing Control Solenoid Valve Bank 1 harness is open or shorted, Intake Valve Timing Control Solenoid Valve Bank 1 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 21,768

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 29, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
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Code P1111 Infiniti Description

The intake valve timing control solenoid valve is activated by ON/OFF pulse duty (ratio) signals from the Engine Control Module (ECM). The intake valve timing control solenoid valve changes the oil amount and direction of flow through the intake valve timing control unit or stops oil flow.
The longer pulse width advances the valve angle. The shorter pulse width retards the valve angle.
When ON and OFF pulse widths become equal, the solenoid valve stops oil pressure flow to fix the intake valve angle at the control position.
The Diagnostic Trouble Code (DTC) when an improper voltage is sent to the ECM through the intake valve timing control solenoid valve.

OBDII Code P1111 Infiniti - Intake Valve Timing Control Solenoid Valve Circuit Bank 1 - AutoCodes.com — P1111 Infiniti Code - Intake Valve Timing Control Solenoid Valve Circuit Bank 1

What does this mean?

What are the Possible Causes of the DTC P1111 Infiniti?

Faulty Intake Valve Timing Control Solenoid Valve Bank 1
Intake Valve Timing Control Solenoid Valve Bank 1 harness is open or shorted
Intake Valve Timing Control Solenoid Valve Bank 1 circuit poor electrical connection

How to Fix the DTC P1111 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 does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1111 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.

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Information for Specific Infiniti Models

P1111 2003 Infiniti G35 — Intake Valve Timing Control Solenoid Valve Circuit Bank 1
P1111 2004 Infiniti G35 — Intake Valve Timing Control Solenoid Valve Circuit Bank 1

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.