P1801 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 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.
Code P1801 Description
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.
What are the Possible Causes of the DTC P1801?
- 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?
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 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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Information for Specific Makes
- P1801 Buick — Performance Selector Switch Failure
- P1801 Cadillac — Performance Selector Switch Failure
- P1801 Chevrolet — Performance Selector Switch Failure
- P1801 GMC — Performance Selector Switch Failure
- P1801 Hyundai — Immobilizer Transponder Error
- P1801 Infiniti — Variable Intake Air System Control Solenoid Valve 2
- P1801 KIA — Immobilizer Transponder Error
- P1801 Nissan — Variable Intake Air System Control Solenoid Valve 2
Frequently Asked Questions about P1801 Code
1. What are the common symptoms of OBDII code P1801 (Variable Intake Air System Control Solenoid Valve 2)?
- Common symptoms include engine stalling, rough idling, poor acceleration, and decreased fuel efficiency.
2. What can cause OBDII code P1801 to occur?
- The code can be triggered by a faulty Variable Intake Air System Control Solenoid Valve 2, wiring issues, or a vacuum leak in the intake system.
3. How serious is OBDII code P1801?
- While the severity can vary, it is recommended to address this code promptly to prevent further damage to the engine and ensure optimal performance.
4. How can I diagnose OBDII code P1801?
- Diagnosing this code typically involves using a scan tool to retrieve the code, performing a visual inspection of the solenoid valve and its wiring, and conducting tests to check for proper functionality.
5. Can I drive my vehicle with OBDII code P1801?
- It is not recommended to drive with this code present, as it can lead to performance issues and potential damage to the engine components.
6. How can I repair OBDII code P1801?
- Repair options may include replacing the Variable Intake Air System Control Solenoid Valve 2, repairing any damaged wiring, and addressing any vacuum leaks in the intake system.
7. What is the function of the Variable Intake Air System Control Solenoid Valve 2?
- The valve controls the intake of air into the engine, helping to optimize performance and fuel efficiency based on driving conditions.
8. Are there any common triggers for OBDII code P1801?
- Common triggers for this code include a malfunctioning solenoid valve, electrical issues, or problems with the vacuum system in the intake.
9. How much does it typically cost to repair OBDII code P1801?
- The cost of repair can vary depending on the cause of the issue, but it may range from around $100 to $300 for parts and labor.
10. Can OBDII code P1801 be a recurring issue?
- If the underlying cause of the code is not properly addressed, it can recur, leading to ongoing performance issues and potential damage to the engine.
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