What causes fault code P0107?

• Most likely: Faulty MAP sensor (internal short) • Likely: Wiring open circuit or short to ground on the signal wire • Possible: Loss of 5V reference voltage from the ECU • Rare: Faulty Engine Control Unit (ECU)

Powertrain (Engine & Gearbox)Standard EOBD

P0107 - Manifold Absolute Pressure (MAP) Barometric Pressure Circuit Low Input

Q: What are the symptoms of fault code P0107?

• Check Engine Light (MIL) illuminated • Engine difficult to start or stalls at idle • Noticeable loss of power and hesitation during acceleration • Poor fuel economy and black exhaust smoke • Rough or surging idle

Q: How do you fix fault code P0107?

STEP 1: Inspect the MAP sensor connector for oxidation, loose pins, or moisture. Check vacuum hoses for leaks or blockages. STEP 2: Measure the 5V reference voltage at the sensor connector with ignition on. Verify ground continuity (should be near 0 Ohms back to chassis). STEP 3: Check signal voltage with ignition on, engine off. At sea level/atmospheric pressure, it should read between 4.0V and 4.8V. If reading 0V despite having 5V reference, the sensor is faulty. STEP 4: Use an oscilloscope or OBD scanner to monitor MAP values in real-time while wiggling the harness. If values fluctuate wildly or stay at zero, replace the MAP sensor and clear codes.

Last updated:1 February 2026

Related:MAP Sensor, Kablage / Ledningsnett, Engine Control Unit (ECU), Vakuumslangar, TPS (Throttle Position Sensor)

System

Powertrain (Engine & Gearbox)

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Technical Description

P0107 is set when the Engine Control Unit (ECU) detects a voltage signal from the Manifold Absolute Pressure (MAP) sensor that is lower than the calibrated minimum threshold (typically below 0.2V to 0.5V). The MAP sensor provides input to the ECU for calculating air density and fuel delivery requirements. A low input usually signifies an open circuit, a short to ground in the signal wire, or a complete sensor failure. The ECU will substitute MAP values with throttle position (TPS) sensor data to maintain engine operation, often triggering a limp-home mode.

Possible Causes

Faulty MAP sensor (internal short)

Wiring open circuit or short to ground on the signal wire

Loss of 5V reference voltage from the ECU

Faulty Engine Control Unit (ECU)

Symptoms

Check Engine Light (MIL) illuminated

Engine difficult to start or stalls at idle

Noticeable loss of power and hesitation during acceleration

Poor fuel economy and black exhaust smoke

Rough or surging idle

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P0107 - Manifold Absolute Pressure (MAP) Barometric Pressure Circuit Low Input

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P0107 - Manifold Absolute Pressure (MAP) Barometric Pressure Circuit Low Input

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