AutoCodes – Infiniti – P1800 2002 Infiniti I35

P1800 2002 Infiniti I35 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 2002 Infiniti I35 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.

Save to My Repairs Step-by-Step Diagnostic Guide My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 23,752

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
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1800 2002 Infiniti I35 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 2002 Infiniti I35 - Variable Intake Air System Control Solenoid Valve Circuit - AutoCodes.com — P1800 2002 Infiniti I35 Code - Variable Intake Air System Control Solenoid Valve Circuit

What does this mean?

What are the Possible Causes of the DTC P1800 2002 Infiniti I35?

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 2002 Infiniti I35?

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 2002 Infiniti I35 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 P1800 2002 Infiniti I35 code?

Need more information on how to fix the P1800 2002 Infiniti I35 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1800 2002 Infiniti I35 code diagnosed by a professional: Find a repair shop in your area

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 2002 Infiniti I35 Code

1. What are the common symptoms of OBDII code P1800 on a 2002 Infiniti I35?

The common symptoms include rough idling, engine stalling, decreased fuel efficiency, and difficulty starting the vehicle.

2. What causes the OBDII code P1800 on a 2002 Infiniti I35?

The code P1800 is typically triggered by a malfunction in the Variable Intake Air System Control Solenoid Valve circuit, which can be caused by a faulty solenoid valve, wiring issues, or a defective PCM.

3. How can I diagnose the Variable Intake Air System Control Solenoid Valve circuit issue on my 2002 Infiniti I35?

Diagnosing the issue involves checking the solenoid valve for proper operation, inspecting the wiring for any damage or loose connections, and testing the PCM for functionality using a diagnostic scanner.

4. Can I still drive my 2002 Infiniti I35 with the OBDII code P1800?

It is not recommended to drive the vehicle with the P1800 code as it can lead to further damage to the engine and other components. It is best to address the issue promptly to prevent any potential safety hazards.

5. How can I repair the Variable Intake Air System Control Solenoid Valve circuit on my 2002 Infiniti I35?

Repairing the issue may involve replacing the faulty solenoid valve, repairing or replacing damaged wiring, or reprogramming the PCM if necessary. It is recommended to consult a professional mechanic for proper diagnosis and repair.

6. Will resetting the OBDII code P1800 on my 2002 Infiniti I35 make it go away permanently?

Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing the P1800 code is not addressed, the code is likely to reappear once the vehicle is driven again.

7. How much does it typically cost to repair the Variable Intake Air System Control Solenoid Valve circuit issue on a 2002 Infiniti I35?

The cost of repair can vary depending on the extent of the issue and the specific repairs needed. It is recommended to get a diagnostic inspection from a qualified mechanic to get an accurate estimate.

8. Can a DIY enthusiast with basic automotive knowledge fix the Variable Intake Air System Control Solenoid Valve circuit issue on a 2002 Infiniti I35?

While some DIY enthusiasts may be able to replace the solenoid valve or address simple wiring issues, diagnosing and repairing the P1800 code may require specialized tools and expertise. It is advisable to seek professional help for complex repairs.

9. Are there any preventative maintenance tips to avoid the OBDII code P1800 on a 2002 Infiniti I35?

Regularly inspecting the intake air system components, ensuring proper maintenance of the solenoid valve, and addressing any engine performance issues promptly can help prevent the occurrence of the P1800 code.

10. How long does it typically take to repair the Variable Intake Air System Control Solenoid Valve circuit issue on a 2002 Infiniti I35?

The repair time can vary depending on the specific issue and the availability of parts. In general, it may take a few hours to a full day to diagnose and repair the Variable Intake Air System Control Solenoid Valve circuit on a 2002 Infiniti I35.