P0107: Manifold Absolute Pressure/Barometric Pressure Circuit Low

What does P0107 mean?

The MAP sensor reports intake manifold pressure as a voltage signal. The engine computer supplies it with a 5 volt reference and uses the returned signal to estimate engine load and set fuel delivery. P0107 is a circuit code: the signal is lower than the sensor should ever produce.

Because it is a low voltage circuit fault, the references point first at the sensor and at the wiring between the sensor and the computer, including the reference and ground circuits.

Common symptoms

• Check engine light on
• Hard starting or long cranking
• Rough running or hesitation
• Poor fuel economy
• In some cases black smoke from the exhaust

Common causes

The causes below are the ones commonly seen with P0107. The actual cause can vary by vehicle, engine and mileage, so treat this list as a starting point, not a diagnosis.

• A faulty MAP or barometric pressure sensor
• An open or short in the sensor signal circuit
• A problem in the 5 volt reference or ground circuit of the sensor
• Damaged or corroded connectors at the sensor

What to check with a scanner

• With the key on and engine off, look at the MAP reading in Live data. It should be close to local barometric pressure, not near zero.
• Read freeze frame data to see engine load and rpm when the code set.
• Inspect the sensor connector and harness for damage, corrosion or a loose fit.
• Note other sensor codes that share a 5 volt reference, as one shorted sensor can pull the reference down.

How to read and clear P0107 with OBD Master Pro

1. Plug in your adapter. Connect a generic ELM327 (or ELM329) OBD2 adapter to the diagnostic port, usually under the dashboard on the driver's side. Bluetooth Classic, Bluetooth LE, Wi-Fi and USB OTG adapters are supported.
2. Switch the ignition on. Turn the key to ON or start the engine, depending on your car.
3. Connect in OBD Master Pro. Open the app, go to Connection and pick your adapter. Classic Bluetooth adapters connect from the Bluetooth tab, Bluetooth LE adapters from the BLE tab with no pairing needed. Use the generic OBD2 / EOBD profile or your car's brand profile.
4. Read the codes. Open the fault codes screen to see stored, pending and permanent codes. Confirm P0107 is listed and note any other codes, since they often explain the cause.
5. Check the details. Look at freeze frame data, Live data and, where your car supports it, Mode 06 test results (see the checks above).
6. Fix, then clear. After the repair, clear the codes to turn off the check engine light. Clearing also resets the emissions readiness monitors, so drive normally and check the readiness screen before any inspection. Permanent codes cannot be erased with a scan tool; they clear on their own once the car's self test passes.

Tip: you can also look up P0107 and other codes in the app's DTC search without connecting to a car. If your adapter will not connect, use Connection > Share connection log and email it to support. Many cheap ELM327 clones only handle basic engine OBD2, which is all you need for P0107.

When to see a mechanic

Get professional help if any of these apply:

• The engine is hard to start or stalls
• Wiring needs to be tested with a meter
• The code returns after the connector has been checked

If you are unsure, a qualified technician can confirm the cause with tests such as smoke testing, pressure testing or scope readings. Clearing a code does not repair the fault.

Related trouble codes

See all OBD2 trouble code guides

Related guides

Check engine light on: what to do · How to read an OBD2 code (P, B, C, U) · Stored, pending and permanent codes and freeze frame · OBD2 readiness monitors explained · OBD2 glossary · OBD2 by car brand