AutoCodes – Nissan – P1801 2009 Nissan Altima Sedan

P1801 2009 Nissan Altima Sedan Code - Variable Intake Air System Control Solenoid Valve 2

Quick Answer

When the engine is running at low or medium speed, the power valve is fully closed. Common causes include Faulty VIAS control solenoid valve 2, 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: P1801 2009 Nissan Altima Sedan indicates Variable Intake Air System Control Solenoid Valve 2.
Common causes: Common causes include Faulty VIAS control solenoid valve 2, 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 5,097

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 20, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1801 2009 Nissan Altima Sedan 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.

OBDII Code P1801 2009 Nissan Altima Sedan - Variable Intake Air System Control Solenoid Valve 2 - AutoCodes.com — P1801 2009 Nissan Altima Sedan Code - Variable Intake Air System Control Solenoid Valve 2

What does this mean?

What are the Possible Causes of the DTC P1801 2009 Nissan Altima Sedan?

Faulty VIAS control solenoid valve 2
VIAS control solenoid valve circuit harness is open or shorted
VIAS control solenoid valve circuit poor electrical connection

How to Fix the DTC P1801 2009 Nissan Altima Sedan?

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 P1801 2009 Nissan Altima Sedan 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 P1801 2009 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P1801 in a 2009 Nissan Altima Sedan related to the Variable Intake Air System Control Solenoid Valve 2?

The common symptoms include rough idling, engine hesitation, decreased fuel efficiency, and potential stalling.

2. What could be the possible causes of OBDII code P1801 in a 2009 Nissan Altima Sedan related to the Variable Intake Air System Control Solenoid Valve 2?

Possible causes may include a faulty solenoid valve, wiring issues, vacuum leaks, or a malfunctioning engine control module (ECM).

3. How can I diagnose the Variable Intake Air System Control Solenoid Valve 2 issue triggering OBDII code P1801 on my 2009 Nissan Altima Sedan?

Diagnosing the issue involves checking the solenoid valve for proper operation, inspecting the wiring for any damage, testing vacuum lines for leaks, and scanning the ECM for related error codes.

4. Is it safe to continue driving my 2009 Nissan Altima Sedan with OBDII code P1801 related to the Variable Intake Air System Control Solenoid Valve 2?

It is not recommended to drive your vehicle with this code as it can lead to further engine problems and potential breakdowns. It's best to address the issue promptly.

5. Can I repair the Variable Intake Air System Control Solenoid Valve 2 issue triggering OBDII code P1801 on my 2009 Nissan Altima Sedan myself?

Depending on your mechanical skills, you may be able to repair the issue yourself by replacing the solenoid valve, fixing wiring problems, or addressing vacuum leaks. However, professional help is recommended for accurate diagnosis and repair.

6. How much does it typically cost to repair OBDII code P1801 related to the Variable Intake Air System Control Solenoid Valve 2 on a 2009 Nissan Altima Sedan?

The cost of repair can vary based on the underlying issue and labor rates in your area. On average, expect to pay anywhere from $150 to $500 for parts and labor.

7. Are there any preventative maintenance tips to avoid OBDII code P1801 related to the Variable Intake Air System Control Solenoid Valve 2 in my 2009 Nissan Altima Sedan?

Regularly checking and maintaining the intake system components, such as the solenoid valve and associated wiring, can help prevent issues that trigger this code. Additionally, following the manufacturer's recommended service schedule is crucial.

8. Will resetting the OBDII code P1801 related to the Variable Intake Air System Control Solenoid Valve 2 on my 2009 Nissan Altima Sedan make it go away permanently?

Simply resetting the code will not fix the underlying problem causing the code to appear. It's important to diagnose and address the root cause to prevent the code from reoccurring.

9. Can a faulty Variable Intake Air System Control Solenoid Valve 2 impact the overall performance of my 2009 Nissan Altima Sedan?

Yes, a faulty solenoid valve can affect the engine's performance by causing issues such as rough idling, poor acceleration, and decreased fuel efficiency.

10. How long does it typically take to repair OBDII code P1801 related to the Variable Intake Air System Control Solenoid Valve 2 on a 2009 Nissan Altima Sedan?

The repair time can vary depending on the exact issue and the technician's experience. In general, it may take anywhere from 1 to 3 hours to diagnose and repair the problem.