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:
- P0068: MAP/MAF – Throttle Position Correlation
- P0069: Manifold Absolute Pressure – Barometric Pressure Correlation
- P0105: Manifold Absolute Pressure/Barometric Pressure Circuit
- P0106: Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem
- P0107: Manifold Absolute Pressure/Barometric Pressure Circuit Low Input
- P0108: Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- P0109: Manifold Absolute Pressure/Barometric Pressure Circuit Intermittent
- P2073: Manifold Absolute Pressure/Mass Air Flow - Throttle Position Correlation at Idle
- P2074: Manifold Absolute Pressure/Mass Air Flow - Throttle Position Correlation at Higher Load
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:
- Damaged or defective Manifold Absolute Pressure (MAP) sensor
- Shorted or open electrical harness to Manifold Absolute Pressure (MAP) switch solenoid valve
- Damaged, corroded, open, or shorted electrical connectors
- Damaged or defective ECM
What are the symptoms of the P1105 code?
Symptoms of a P1105 code may include:
- Check engine or warning light may illuminate
- The vehicle may idle roughly
- The engine may hesitate to start
- Decrease in fuel economy
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
Additional information related to a P1105 code
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?
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