Diagnostic Trouble Code (DTC): P1105 - MAP/BARO Pressure Switch Solenoid Valve

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Diagnostic is a diagnostic trouble code (DTC) for "Trouble Code (DTC) P1105 - MAP/BARO Pressure Switch Solenoid Valve". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

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P1105 code definition

The P1105 code is a manufacturer specific powertrain code that means the engine control module (ECM) has detected a fault or malfunction with the Manifold Absolute Pressure (MAP)/Barometric (BARO) pressure switch solenoid valve.

Codes related to the P1105 include:

What the P1105 code means

A code P1105 will be stored when the voltage signal from the MAP/BARO pressure switch that received by the engine control module (ECM) is too high or too low.

The ECM uses the Manifold Absolute Pressure (MAP) sensor to read manifold pressure and calculate air density and air mass flow rate. This information then determines how much fuel metering is needed for combustion. The MAP/BARO switch solenoid valve is used to switch the airflow passage based on voltage signals sent by the ECM.

Some Nissan vehicles will have the MAP sensor is built into the ECM.

What causes the P1105 code?

Several problems may cause a P1105 code including:

What are the symptoms of the P1105 code?

Symptoms of a P1105 code may include:

How does a mechanic diagnose the P1105 code?

A mechanic may use several methods to diagnose a P1105 trouble code, including:

  • Utilize an OBD-II scanner to check for a stored P1105 trouble code
  • Visually inspect the electrical wiring for corrosion or signs of damage
  • Check electrical connectors, harness, and relays for signs of damage
  • Check vacuum line for tears or leaks
  • Check for damaged or defective MAP sensor
  • Use a vacuum testing device to check BARO sensor
  • Check MAP pressure switch for power and signal

Common mistakes when diagnosing the P1105 code

One common mistake when diagnosing a P1105 code is replacing the sensors without checking for any leaks or electrical connection issues first.

How serious is the P1105 code?

Because a vehicle’s safe driving operation most likely will be impacted due to faults that store a P1105 code, this code is considered a potentially serious code. When this code appears, it is recommended to immediately take your vehicle to your local service center or mechanic for repair and diagnosis.

What repairs can fix the P1105 code?

Several repairs can fix a P1105 trouble code and include:

  • Repair or replace damaged, corroded, open, or shorted electrical wiring and related connectors
  • Repair or replace leaking vacuum lines
  • Replace damaged or defective MAP sensor
  • Replace damaged or defective BARO sensor
  • Replace damaged or defective ECM
  • Clear all codes, test-drive the vehicle, and rescan to see if any codes reappear

Note, most Nissan makes and models have the MAP sensor in a different location, so it is recommended to check your vehicle service manual for specifics as to the location in your vehicle. This trouble code also applies to some Infiniti models.

Need help with a P1105 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6220.

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