The 2020 Ford Explorer uses MAP sensor data to calculate engine load and fuel requirements. When P0107 appears, the ECU is receiving lower voltage than expected from the MAP sensor—indicating either a genuine low-pressure condition, sensor failure, or electrical fault.
What P0107 Means
P0107 indicates the MAP sensor circuit voltage is below the minimum threshold. At idle, some low reading (vacuum) is normal, but the signal should still be within a specific voltage range. If it drops below minimum, P0107 sets. This could indicate high vacuum (unlikely), sensor failure, or circuit problems.
Explorer Engine Options
The 2020 Explorer offers a 2.3L EcoBoost four-cylinder, 3.0L EcoBoost V6, or 3.3L hybrid. All turbocharged models are particularly sensitive to MAP sensor accuracy for boost calculations. Low MAP readings cause the ECU to assume higher vacuum/lower load than actually exists.
Common Causes of P0107
Wiring issues causing voltage drop are common. Corroded connections, damaged wires, or poor grounds reduce signal voltage reaching the ECU. The sensor may output correct voltage, but it's lost in transmission.
A failed MAP sensor stuck outputting low voltage causes P0107. Internal component failure can lock the sensor in a low-reading state regardless of actual manifold pressure.
Reference voltage problems can cause low output. The MAP sensor needs a stable 5V reference from the ECU. If this reference is low, sensor output will be proportionally low.
Diagnostic Process
Check MAP sensor voltage with key on, engine off—should be near 5V (atmospheric pressure). At idle, voltage drops to reflect manifold vacuum (typically 1-2V). If readings are abnormally low in either condition, check wiring and reference voltage. Verify the 5V reference from ECU is present at the sensor connector.