AutoCodes – Nissan – P1801 2012 Nissan Altima Sedan

P1801 2012 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 2012 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 4,323

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 2012 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 2012 Nissan Altima Sedan - Variable Intake Air System Control Solenoid Valve 2 - AutoCodes.com — P1801 2012 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 2012 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 2012 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 2012 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.

Need more information about the P1801 2012 Nissan Altima Sedan 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.

Frequently Asked Questions about P1801 2012 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P1801 in a 2012 Nissan Altima Sedan related to the Variable Intake Air System Control Solenoid Valve 2?

The common symptoms include rough idle, decreased engine performance, and potential stalling of the vehicle.

2. What are the possible causes of OBDII code P1801 in a 2012 Nissan Altima Sedan?

The code P1801 typically indicates a fault with the Variable Intake Air System Control Solenoid Valve 2, which can be caused by wiring issues, a faulty solenoid valve, or a problem with the intake system.

3. How can I diagnose the Variable Intake Air System Control Solenoid Valve 2 issue triggering OBDII code P1801 in my 2012 Nissan Altima Sedan?

A thorough inspection of the solenoid valve and its wiring for any visible damage, as well as conducting a continuity test to check for electrical continuity, can help diagnose the problem.

4. Can I still drive my 2012 Nissan Altima Sedan with OBDII code P1801 related to the Variable Intake Air System Control Solenoid Valve 2?

While it may be possible to drive the vehicle with this code, it is recommended to address the issue promptly to prevent further damage to the engine or other components.

5. What are some repair tips for fixing OBDII code P1801 in a 2012 Nissan Altima Sedan caused by the Variable Intake Air System Control Solenoid Valve 2?

Repair tips include checking and repairing any damaged wiring, testing and replacing the faulty solenoid valve if necessary, and ensuring proper installation for a reliable fix.

6. How much does it typically cost to repair OBDII code P1801 in a 2012 Nissan Altima Sedan related to the Variable Intake Air System Control Solenoid Valve 2?

The cost of repair can vary depending on the extent of the issue, the need for replacement parts, and labor costs, but it is advisable to consult a professional for an accurate estimate.

7. Can resetting the OBDII system clear the P1801 code in a 2012 Nissan Altima Sedan caused by the Variable Intake Air System Control Solenoid Valve 2?

While resetting the system may temporarily clear the code, it is crucial to address the underlying issue causing the fault code to prevent it from reoccurring.

8. Are there any preventive measures to avoid OBDII code P1801 related to the Variable Intake Air System Control Solenoid Valve 2 in a 2012 Nissan Altima Sedan?

Regular maintenance, such as inspecting the intake system components and addressing any issues promptly, can help prevent the occurrence of code P1801 in the future.

9. Can a DIY enthusiast with basic automotive knowledge fix OBDII code P1801 in a 2012 Nissan Altima Sedan related to the Variable Intake Air System Control Solenoid Valve 2?

While some aspects of the repair may be manageable for a DIY enthusiast, it is recommended to consult a professional mechanic for proper diagnosis and repair to ensure the issue is resolved correctly.

10. Is it necessary to replace the Variable Intake Air System Control Solenoid Valve 2 when dealing with OBDII code P1801 in a 2012 Nissan Altima Sedan?

If the solenoid valve is found to be faulty during diagnosis, it is advisable to replace it to rectify the issue triggering code P1801 and restore the proper functioning of the intake air system.