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P1105 1999 Infiniti I30 Code - Manifold Absolute Pressure/Barometric Pressure Switch Solenoid Valve

Quick Answer

The P1105 diagnostic trouble code (DTC) in a 1999 Infiniti I30 indicates a problem with the Manifold Absolute Pressure (MAP) sensor or Barometric Pressure (BARO) sensor switch solenoid valve. Common causes include Electrical Faults: Wiring issues, corroded connectors, or a faulty solenoid can disrupt the communication between the sensors and the ECU, Vacuum Leaks: Any leaks in the vacuum lines connected to the MAP/BARO switch solenoid valve can lead to inaccurate pressure readings, Mechanical Failure: The solenoid valve itself may be stuck open or closed, preventing proper operation. 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
P1105 1999 Infiniti I30 indicates Manifold Absolute Pressure/Barometric Pressure Switch Solenoid Valve.
Common causes
Common causes include Electrical Faults: Wiring issues, corroded connectors, or a faulty solenoid can disrupt the communication between the sensors and the ECU, Vacuum Leaks: Any leaks in the vacuum lines connected to the MAP/BARO switch solenoid valve can lead to inaccurate pressure readings, Mechanical Failure: The solenoid valve itself may be stuck open or closed, preventing proper operation.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code P1105 1999 Infiniti I30 Description

The P1105 diagnostic trouble code (DTC) in a 1999 Infiniti I30 indicates a problem with the Manifold Absolute Pressure (MAP) sensor or Barometric Pressure (BARO) sensor switch solenoid valve. The MAP sensor measures the intake manifold pressure, which is crucial for the engine control unit (ECU) to calculate air/fuel mixture and ignition timing. The BARO sensor provides information about the atmospheric pressure outside the engine, allowing the ECU to adjust fuel delivery and ignition timing based on altitude changes.

OBDII Code P1105 1999 Infiniti I30 - Manifold Absolute Pressure/Barometric Pressure Switch Solenoid Valve
P1105 1999 Infiniti I30 Code - Manifold Absolute Pressure/Barometric Pressure Switch Solenoid Valve

Common Causes of P1105 1999 Infiniti I30

  1. Electrical Faults: Wiring issues, corroded connectors, or a faulty solenoid can disrupt the communication between the sensors and the ECU.
  2. Vacuum Leaks: Any leaks in the vacuum lines connected to the MAP/BARO switch solenoid valve can lead to inaccurate pressure readings.
  3. Mechanical Failure: The solenoid valve itself may be stuck open or closed, preventing proper operation.
  4. Sensor Malfunction: The MAP or BARO sensor itself may be faulty, leading to incorrect pressure readings being sent to the ECU.
  5. Environmental Factors: Exposure to extreme temperatures or harsh conditions can cause the solenoid valve to degrade over time.

Symptoms of P1105 1999 Infiniti I30

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
  2. Poor Performance: The vehicle may experience reduced power, rough idling, hesitation during acceleration, and overall poor performance.
  3. Reduced Fuel Efficiency: A faulty MAP/BARO switch solenoid valve can lead to decreased fuel efficiency as the engine struggles to maintain the correct air/fuel mixture.
  4. Stalling: In severe cases, the engine may stall unexpectedly, especially at idle or low speeds.
  5. Emissions Issues: The vehicle may fail emissions tests due to improper fuel delivery and combustion caused by the malfunctioning sensor.

How to Fix P1105 1999 Infiniti I30

  1. Diagnostic Testing: Use a scan tool to retrieve the DTC and perform further testing to pinpoint the exact cause of the issue.
  2. Inspect Wiring and Connectors: Check the wiring harness and connectors for any damage, corrosion, or loose connections. Repair or replace as needed.
  3. Test Solenoid Valve: Test the MAP/BARO switch solenoid valve for proper operation. Replace if it fails to function correctly.
  4. Check Vacuum Lines: Inspect the vacuum lines connected to the solenoid valve for leaks or damage. Repair or replace any faulty lines.
  5. Clear Codes and Test Drive: Clear the DTC from the ECU memory, then test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1105 1999 Infiniti I30

The typical repair costs for addressing a P1105 code in a 1999 Infiniti I30 can range from $150 to $400, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour for labor, but rates may be higher in metropolitan areas or at dealerships, while independent shops often charge less. It's recommended to obtain quotes from local shops to get a more accurate estimate for this repair.

When is the Code Detected?

An excessively low or high voltage from the sensor is sent to Engine Control Module (ECM).

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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 P1105 1999 Infiniti I30 Code

1. What are the common symptoms of OBDII code P1105 on a 1999 Infiniti I30?

The common symptoms of code P1105 on a 1999 Infiniti I30 include rough idling, decreased engine performance, and possibly stalling.

2. What causes OBDII code P1105 on a 1999 Infiniti I30?

Code P1105 on a 1999 Infiniti I30 is typically caused by a faulty Manifold Absolute Pressure/Barometric Pressure Switch Solenoid Valve.

3. How can I diagnose OBDII code P1105 on my 1999 Infiniti I30?

To diagnose code P1105 on a 1999 Infiniti I30, you can use an OBDII scanner to read the code and then inspect the Manifold Absolute Pressure/Barometric Pressure Switch Solenoid Valve for any signs of damage or malfunction.

4. Can I drive my 1999 Infiniti I30 with OBDII code P1105?

It is not recommended to drive your 1999 Infiniti I30 with code P1105, as it can lead to further damage to the engine and affect overall performance.

5. How do I repair OBDII code P1105 on a 1999 Infiniti I30?

To repair code P1105 on a 1999 Infiniti I30, you may need to replace the Manifold Absolute Pressure/Barometric Pressure Switch Solenoid Valve with a new, functioning part.

6. Is it possible to reset OBDII code P1105 on a 1999 Infiniti I30 without fixing the issue?

Resetting the code without fixing the underlying issue will only temporarily clear the check engine light. The problem causing code P1105 will persist until properly addressed.

7. Can a clogged air filter cause OBDII code P1105 on a 1999 Infiniti I30?

While a clogged air filter can impact engine performance, it is not typically a direct cause of code P1105. It is best to focus on inspecting and repairing the Manifold Absolute Pressure/Barometric Pressure Switch Solenoid Valve.

8. How much does it cost to fix OBDII code P1105 on a 1999 Infiniti I30?

The cost of fixing code P1105 on a 1999 Infiniti I30 can vary depending on the labor rates and the price of the replacement part. It is advisable to consult with a mechanic for an accurate estimate.

9. Can a DIY enthusiast replace the Manifold Absolute Pressure/Barometric Pressure Switch Solenoid Valve to fix code P1105 on a 1999 Infiniti I30?

While it is possible for a skilled DIY enthusiast to replace the solenoid valve, it is recommended to have the repair done by a professional mechanic to ensure proper installation and functioning.

10. Will fixing OBDII code P1105 improve fuel efficiency on a 1999 Infiniti I30?

Fixing code P1105 on a 1999 Infiniti I30 can help improve fuel efficiency by restoring the proper functioning of the Manifold Absolute Pressure/Barometric Pressure Switch Solenoid Valve and optimizing engine performance.

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