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P1140 Infiniti Code - Intake Valve Timing Control Performance Bank 1

Quick Answer

The P1140 code for Infiniti vehicles refers to an issue with the Intake Valve Timing Control for Bank 1. Common causes include Faulty intake valve timing control solenoid, Malfunctioning camshaft position sensor, Timing chain issues. 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
P1140 Infiniti indicates Intake Valve Timing Control Performance Bank 1.
Common causes
Common causes include Faulty intake valve timing control solenoid, Malfunctioning camshaft position sensor, Timing chain issues.
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 Aug 19, 2024
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Code P1140 Infiniti Description

The P1140 code for Infiniti vehicles refers to an issue with the Intake Valve Timing Control for Bank 1. This means that there is a performance problem with the intake valve timing control system on the first bank of cylinders in the engine. The intake valve timing control system is responsible for adjusting the timing of the intake valves to optimize engine performance, fuel efficiency, and emissions.

OBDII Code P1140 Infiniti - Intake Valve Timing Control Performance Bank 1
P1140 Infiniti Code - Intake Valve Timing Control Performance Bank 1

Common Causes of P1140 Infiniti

  1. Faulty intake valve timing control solenoid
  2. Malfunctioning camshaft position sensor
  3. Timing chain issues
  4. Wiring or electrical problems
  5. Engine oil contamination or sludge buildup

Symptoms of P1140 Infiniti

  1. Reduced engine power
  2. Rough idling or misfires
  3. Poor fuel efficiency
  4. Engine stalling
  5. Illumination of the check engine light

How to Fix P1140 Infiniti

  1. Diagnose the specific cause of the issue using a scan tool to pinpoint the exact component that is malfunctioning.
  2. Replace the faulty intake valve timing control solenoid or camshaft position sensor.
  3. Inspect and potentially replace the timing chain if it is worn or damaged.
  4. Check and repair any wiring or electrical connections related to the intake valve timing control system.
  5. Perform a thorough inspection of the engine for any oil contamination or sludge buildup, and clean or flush the system as needed.

Cost to Fix P1140 Infiniti

The typical repair costs for addressing the P1140 code on an Infiniti vehicle can range from $200 to $600, including parts and labor. However, it's important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's recommended to check with local shops for a more accurate estimate.

What does this mean?

Tech Notes for P1140 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 engine oil and filter and reset engine code.

When is the Code Detected?

When there is a gap between angle of target and phase-control angle degree, the valve will stop working and the ECM will trigger the P1140 code.

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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.

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