P0107: Manifold Absolute Pressure/Barometric Pressure Circuit Low Input
Updated November 15, 2026
The manifold absolute pressure (MAP) sensor measures pressure (vacuum) inside the intake so the engine computer can work out engine load. P0107 means the sensor's signal voltage has dropped below the range a working sensor should ever produce. That is an electrical problem in the sensor or its wiring, not a vacuum leak.
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🔧 Want to check this yourself? An OBD2 scanner reads the code; models with live data also show the sensor readings used in the checks below. See code readers and scanners from $24.99 ↓ · Which scanner do I need?
Common causes
- A failed MAP sensor
- An unplugged sensor, or a loose or corroded connector
- A broken signal or 5-volt reference wire, or a signal wire shorted to ground
- A short on the shared 5-volt reference circuit from another sensor, which often sets low-voltage codes for several sensors at once (such as P0122)
Code meanings can vary slightly by manufacturer. Use these as a starting point and confirm with your vehicle's service information or a mechanic before replacing parts.
Symptoms
- Check engine light
- Rough running, hesitation or poor power
- Poor fuel economy
- Hard starting or stalling on some vehicles
Is it safe to drive?
If the engine stalls, hesitates badly or loses power, don't keep driving it; have it towed or checked. If it runs normally with a steady light, drive gently and get it fixed soon, since the engine computer is using a backup value instead of a real load reading.
How to check it with a scanner
- Plug an OBD2 scanner into the port under the dashboard and read all stored codes and the freeze-frame data (the conditions when the code set).
- Scan for other codes. Several sensor 'circuit low' codes at the same time point to the shared 5-volt reference or a ground, not to each sensor.
- With the key on and engine off, compare the MAP reading in live data with the local barometric pressure from a weather app. A reading near zero, or a sensor voltage near 0 volts, confirms a circuit or sensor fault.
- With the key off, check that the connector is fully seated and look for corrosion, bent pins and chafed wires.
- With a multimeter, back-probe the connector with the key on: the reference wire should show about 5 volts and the ground wire close to 0 volts. If both are good and the signal stays low, the sensor is the likely fault.
- After a repair, clear the code and drive normally for a few days to confirm it doesn't come back.
A basic code reader shows the code; scanners with live data let you watch sensor readings, which is what you need for most of the checks above. See OBD2 scanners under $100.
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Questions
What does P0107 mean?
P0107 is the generic OBD2 code for "Manifold Absolute Pressure/Barometric Pressure Circuit Low Input." The manifold absolute pressure (MAP) sensor measures pressure (vacuum) inside the intake so the engine computer can work out engine load. P0107 means the sensor's signal voltage has dropped below the range a working sensor should ever produce. That is an electrical problem in the sensor or its wiring, not a vacuum leak.
Is it safe to drive with P0107?
If the engine stalls, hesitates badly or loses power, don't keep driving it; have it towed or checked. If it runs normally with a steady light, drive gently and get it fixed soon, since the engine computer is using a backup value instead of a real load reading.
How do I check P0107 myself?
Read the code and freeze-frame data with an OBD2 scanner, then: Scan for other codes. Several sensor 'circuit low' codes at the same time point to the shared 5-volt reference or a ground, not to each sensor. With the key on and engine off, compare the MAP reading in live data with the local barometric pressure from a weather app. A reading near zero, or a sensor voltage near 0 volts, confirms a circuit or sensor fault. With the key off, check that the connector is fully seated and look for corrosion, bent pins and chafed wires. With a multimeter, back-probe the connector with the key on: the reference wire should show about 5 volts and the ground wire close to 0 volts. If both are good and the signal stays low, the sensor is the likely fault.
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