AutoCodes – Nissan – P1800 2009 Nissan Pathfinder

P1800 2009 Nissan Pathfinder Code - Variable Intake Air System Control Solenoid Valve Circuit

Quick Answer

When the engine is running at low or medium speed, the power valve is fully closed. Common causes include Faulty Variable Intake Air System (VIAS) Control Solenoid Valve, VIAS Control Solenoid Valve circuit harness is open or shorted, VIAS Control Solenoid 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: P1800 2009 Nissan Pathfinder indicates Variable Intake Air System Control Solenoid Valve Circuit.
Common causes: Common causes include Faulty Variable Intake Air System (VIAS) Control Solenoid Valve, VIAS Control Solenoid Valve circuit harness is open or shorted, VIAS Control Solenoid 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 3,924

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, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
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Code P1800 2009 Nissan Pathfinder Description

When the engine is running at low or medium speed, the power valve is fully closed. Under this condition, the effective suction port length is equivalent to the total length of the intake manifold collector's suction port including the intake valve. This long suction port provides increased air intake which results in improved suction efficiency and higher torque generation.
The surge tank and one-way valve are provided. When the engine is running at high speed, the Engine Control Module (ECM) sends the signal to the Variable Intake Air System (VIAS) control solenoid valve. This signal introduces the intake manifold vacuum into the power valve actuator and therefore opens the power valve to two suction passages together in the collector.
Under this condition, the effective port length is equivalent to the length of the suction port provided independently for each cylinder. This shortened port length results in enhanced engine output with reduced suction resistance under high speeds.
The VIAS control solenoid valve cuts the intake manifold vacuum signal for power valve control. It responds to ON/OFF signals from the ECM. When the solenoid is off, the vacuum signal from the intake manifold is cut. When the ECM sends an ON signal the coil pulls the plunger downward and feeds the vacuum signal to the power valve actuator. The Diagnostic Trouble Code (DTC) will be set when an excessively low or high voltage signal is sent to ECM through the valve

OBDII Code P1800 2009 Nissan Pathfinder - Variable Intake Air System Control Solenoid Valve Circuit - AutoCodes.com — P1800 2009 Nissan Pathfinder Code - Variable Intake Air System Control Solenoid Valve Circuit

What does this mean?

What are the Possible Causes of the DTC P1800 2009 Nissan Pathfinder?

Faulty Variable Intake Air System (VIAS) Control Solenoid Valve
VIAS Control Solenoid Valve circuit harness is open or shorted
VIAS Control Solenoid Valve circuit poor electrical connection

How to Fix the DTC P1800 2009 Nissan Pathfinder?

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 P1800 2009 Nissan Pathfinder 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 P1800 2009 Nissan Pathfinder Code

1. What are the common symptoms of OBDII code P1800 in a 2009 Nissan Pathfinder?

The common symptoms of OBDII code P1800 include rough idling, decreased engine performance, and potential stalling of the vehicle.

2. What does the OBDII code P1800 indicate in a 2009 Nissan Pathfinder?

OBDII code P1800 in a 2009 Nissan Pathfinder relates to a fault in the Variable Intake Air System Control Solenoid Valve Circuit.

3. What are the possible causes of OBDII code P1800 in a 2009 Nissan Pathfinder?

The possible causes of OBDII code P1800 in a 2009 Nissan Pathfinder include a faulty Variable Intake Air System Control Solenoid Valve, wiring issues, or a malfunctioning Engine Control Module (ECM).

4. How can I diagnose the Variable Intake Air System Control Solenoid Valve Circuit in a 2009 Nissan Pathfinder?

To diagnose the Variable Intake Air System Control Solenoid Valve Circuit, you can perform a visual inspection of the valve and its wiring, check for any loose connections, and use a multimeter to test for continuity and proper voltage.

5. Can I still drive my 2009 Nissan Pathfinder with OBDII code P1800?

It is not recommended to drive your 2009 Nissan Pathfinder with OBDII code P1800, as it can lead to further engine damage and potential safety hazards. It is best to address the issue promptly.

6. How do I repair OBDII code P1800 in my 2009 Nissan Pathfinder?

Repairing OBDII code P1800 in a 2009 Nissan Pathfinder may involve replacing the Variable Intake Air System Control Solenoid Valve, repairing any damaged wiring, or reprogramming the Engine Control Module (ECM).

7. Can I reset OBDII code P1800 in my 2009 Nissan Pathfinder with a simple reset tool?

While you can reset the OBDII code P1800 with an OBDII scanner, it is important to address the underlying issue causing the fault code to prevent it from reoccurring.

8. How much does it cost to repair OBDII code P1800 in a 2009 Nissan Pathfinder?

The cost of repairing OBDII code P1800 in a 2009 Nissan Pathfinder can vary depending on the exact cause of the issue, the parts needed, and labor costs. It is advisable to consult a professional mechanic for an accurate estimate.

9. Are there any preventative measures to avoid OBDII code P1800 in my 2009 Nissan Pathfinder?

Regular maintenance, such as checking and cleaning the Variable Intake Air System components, can help prevent issues that may trigger OBDII code P1800 in a 2009 Nissan Pathfinder.

10. Is OBDII code P1800 a common issue in 2009 Nissan Pathfinders?

While OBDII code P1800 is not as common as some other codes, it can still occur in 2009 Nissan Pathfinders due to various factors like wear and tear, electrical issues, or component failures.