AutoCodes.com | All About OBDII Engine Codes
AutoCodes - Nissan - P1801 2009 Nissan Altima Sedan

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

- Code Popularity: 4,603 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
Table of contents
Share on Facebook   Share on Twitter   Share on Linkedin

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

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty VIAS control solenoid valve 2
  • VIAS control solenoid valve circuit harness is open or shorted
  • VIAS control solenoid valve circuit poor electrical connection
⚠ Does your Nissan have Safety Recalls? → Check here

How to Fix the DTC P1801 2009 Nissan Altima Sedan?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Search for P1801 2009 Nissan Altima Sedan Questions and Answers: Search here →

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. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

When is the Code Detected?

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. An excessively low or high voltage signal is sent to ECM through the valve

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

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

Need More Information on the Code?

Need more information on how to fix the P1801 2009 Nissan Altima Sedan code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1801 2009 Nissan Altima Sedan code diagnosed by a professional: Find a repair shop in your area

Code P1801 2009 Nissan Altima Sedan comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the P1801 2009 Nissan Altima Sedan code? Have you replaced any parts?
Any information is appreciated. Thanks