P0107 — Manifold Absolute Pressure/Barometric Pressure Circuit Low Input

OBD2 code P0107 flags a problem with the throttle and intake air metering (manifold absolute pressure/barometric pressure circuit low input). Short, gentle driving to a shop is usually possible. Common culprits: failed electronic throttle motor, dirty throttle body or stuck throttle plate, intake air leaks after the MAF sensor.

powertrain (engine/transmission)

Is it safe to drive?

Caution: drive only if the engine is stable P0107 can cause inaccurate fuel and load control. If the engine runs smoothly, avoid heavy acceleration and arrange prompt diagnosis; do not continue driving if it stalls, surges, or loses substantial power.

Typical symptoms

The check-engine light illuminates and the scanner stores P0107.
The engine idles roughly, hesitates, or may stall momentarily.
Power delivery can feel reduced or the engine may enter a protective limp mode.
Fuel consumption may increase because the controller is compensating for an incorrect pressure reading.
A live MAP value may remain implausibly low instead of responding normally to engine vacuum.

Common causes

The MAP/barometric pressure signal wire is shorted to ground or intermittently contacts a grounded component.
The MAP or barometric pressure sensor has an internal failure that produces an implausibly low output.
A corroded, damaged, or poorly seated sensor connector is pulling the low-input circuit down.
The sensor reference-voltage or ground circuit has excessive resistance, damage, or an incorrect connection.
On vehicles with a separate barometric pressure sensor, that sensor or its low-signal circuit has failed.
An incorrect, improperly calibrated, or incompatible pressure sensor is installed.

How to diagnose with an OBD scanner

Confirm P0107 with an OBD2 scanner Connect an ELM327 adapter to AIScanAuto or another OBD2 scanner. Confirm whether P0107 is current or pending, inspect freeze-frame data, and record the live MAP/barometric pressure value if the tool supports that PID.
Inspect the sensor and wiring Locate the MAP sensor on the intake or charge-air system. Examine its connector and harness for corrosion, bent pins, oil contamination, chafing, or contact with hot and moving components.
Measure reference, ground, and signal Using the vehicle wiring diagram, back-probe the sensor connector with the ignition on. Verify reference voltage, ground integrity, and signal voltage against specifications. P0107 is set when the controller sees a signal below its calibrated low-input threshold.
Separate a wiring short from sensor failure With power off, test the signal circuit for an unintended short to ground or other pins. Repair damaged wiring or terminals if continuity is abnormal. If the circuits pass but the sensor still produces an implausibly low signal, replace or properly calibrate the sensor.
Repair and validate the correction After replacing the sensor or repairing the circuit, clear P0107 with the scanner. Start the engine and confirm the live pressure value changes appropriately between barometric pressure and manifold vacuum, then rescan for the code.

Approximate repair cost

A typical independent-shop repair for P0107 is approximately USD 150-500, depending on whether the fault is a pressure sensor, connector, or wiring repair. These figures are estimates and vary by region, vehicle configuration, and parts availability.

Common questions

What does P0107 mean on this engine?

P0107 means the controller is receiving a voltage below the expected range from the manifold or barometric pressure circuit. Common faults include a grounded signal wire, damaged connector, failed sensor, or defective reference or ground circuit.

Is P0107 usually caused by a vacuum leak?

Usually not as a direct low-input cause. On many MAP-equipped engines, a large vacuum leak drives the reading toward barometric pressure, while P0107 more often indicates a shorted circuit or failed sensor. Electrical testing should confirm the cause.

Can I safely drive with P0107 stored?

Driving may be possible if the engine runs smoothly and the transmission shifts normally, but the code can cause stalling, rough operation, or incorrect fueling. Avoid demanding driving and seek diagnosis promptly if the engine becomes unstable.

Does P0107 always require a MAP sensor replacement?

No. The sensor may be faulty, but P0107 can also result from a shorted signal wire, corrosion, poor terminal contact, or problems in the reference and ground circuits. Confirm the voltage conditions before ordering a sensor.

When your vehicle's engine control unit logs trouble code P0107, it's telling you that the manifold absolute pressure and barometric pressure sensor circuit is showing a voltage reading that drops below its acceptable minimum threshold. In plain terms, the signal wire is reporting a value too close to ground — like a short pulling the circuit down to zero. This reading matters because the ECU relies on accurate pressure data from the intake manifold to calculate how much air is entering the engine and to adjust fuel delivery, ignition timing, and throttle response accordingly.

The manifold absolute pressure sensor (sometimes grouped with barometric pressure in a single unit) lives somewhere on or near the intake manifold. It works by measuring the vacuum inside the intake tract and comparing it against atmospheric pressure. Modern engines use this data constantly to maintain the proper air-fuel mixture under varying loads and altitudes. When P0107 appears, the ECU detects that the sensor's electrical signal has collapsed to an abnormally low level, suggesting either a wiring fault, a power supply problem, or a failed sensor itself dragging the circuit toward ground.

To set P0107, the control module monitors the sensor voltage across multiple drive cycles and compares live readings against factory-calibrated thresholds. The moment the signal stays consistently low — rather than flickering — the ECU locks in the code and often captures a freeze frame snapshot. That snapshot records engine speed, load percentage, coolant temperature, and vehicle speed at the exact moment the fault triggered, which becomes your starting point for diagnosis.

Symptoms

The Check Engine light illuminates and remains on
Engine stalls when decelerating to a stop
Vehicle enters limp-home mode with noticeably reduced power output
Throttle response feels sluggish or unresponsive
Idle speed fluctuates or runs higher than normal
Reduced acceleration under medium to heavy throttle input
Occasional misfires or rough running during low-speed maneuvers

Causes

Failed MAP or barometric pressure sensor pulling the signal circuit low
Signal wire shorted to ground due to damaged insulation or chafing
Loss of reference voltage or ground connection at the sensor connector
Faulty throttle position sensor feeding incorrect data to the ECU
Dirty or carbon-fouled throttle body restricting plate movement
Loose, corroded, or damaged wiring harness connectors in the intake circuit
Contaminated or aging MAF sensor upstream affecting pressure readings
Electronic throttle motor failure causing erratic plate positioning

How to Diagnose

Plug in an OBD2 scanner, retrieve P0107 and any related trouble codes, then record the freeze frame data — this tells you what conditions were present when the fault occurred.
Research whether your vehicle has any manufacturer-specific technical service bulletins addressing P0107, as some applications have documented software corrections or updated sensor specifications.
Perform a thorough visual inspection of the wiring harness and connectors tied to the MAP or barometric sensor — look for broken insulation, melted wires, corrosion buildup, or pins that are bent or pushed out of position.
Test for power and ground at the sensor harness while the connector is unplugged, then use a multimeter to check resistance from the signal wire to chassis ground — a reading near zero ohms confirms a short-to-ground condition in the wiring.
Remove and inspect the throttle body for carbon deposits and verify that the throttle plate opens and closes freely without binding; clean it if necessary.
Monitor live data for throttle position and MAP sensor voltage while commanding the throttle open — both values should respond smoothly and proportionately to pedal input.
Clear P0107 after repairs, then drive the vehicle through the conditions stored in the freeze frame to verify the code does not return.

Repair Options

Throttle body replacement addresses the most severe cases where the assembly itself is faulty, with parts typically running between $250 and $700 depending on make and model. If the MAP or barometric pressure sensor has failed internally, swapping it out costs roughly $150 to $400 for the component alone. Cleaning the throttle body and associated linkage resolves many low-input codes caused by carbon buildup and sticky plates, generally falling between $80 and $200 when performed at a shop.

How Much Does It Cost to Fix P0107?

The total invoice depends entirely on which part caused the fault. Independent shop labor rates typically add $60 to $120 per hour on top of parts costs. Based on typical scenarios:

Throttle body assembly replacement: $250–$700
MAP or barometric pressure sensor replacement: $150–$400
Throttle body cleaning service: $80–$200

For most vehicles, fixing P0107 lands somewhere between $80 and $700 total. The smart move is to diagnose before you buy — replacing the most expensive part first almost never saves money, and wiring faults often mimic sensor failures.

Can You Drive with P0107?

Drive with caution. Many vehicles with this fault will derate power and enter a reduced-performance mode to protect the engine — enough to reach a repair facility, but not advisable for sustained highway travel. If the throttle becomes unresponsive or the engine stalls repeatedly, stop driving and have the vehicle towed. Continued operation under these conditions risks safety and can worsen damage to related components.