OBD-II trouble code
P0107: Manifold Absolute Pressure/Barometric Pressure Circuit Low Input
The MAP/BARO sensor signal voltage has dropped below the normal operating range. The ECM sees a signal that's too low to be valid, usually pointing at a wiring short, a disconnected sensor, or a failed sensor.
Quick facts
- System
- Powertrain
- Category
- Fuel & Air Metering
- Severity
- Medium severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $40 – $350
- DIY difficulty
- Intermediate DIY
What does P0107 mean?
The manifold absolute pressure (MAP) sensor tells the engine control module (ECM) how much pressure — or vacuum — is present in the intake manifold so it can calculate load and meter fuel and spark. On many vehicles the sensor also reads barometric pressure for altitude compensation. P0107 is a circuit-low code: the signal voltage the ECM receives has fallen below the expected range and stays there long enough to be judged a fault. Unlike the range/performance code P0106, which involves an in-range but implausible value, P0107 points at a more clearly electrical problem — the ECM is effectively seeing 'no pressure' or a shorted-low signal.
The usual causes are a signal wire shorted to ground, an open or disconnected sensor, loss of the 5V reference feed, a corroded connector, or an internally failed sensor. A disconnected or leaking vacuum supply can also drag the reading low on some designs. Because the ECM loses a trustworthy load signal, the engine may run poorly, lack power, or default to a backup fueling strategy. Diagnosis centers on confirming the sensor has power, ground, and reference voltage, then checking the signal wire for a short to ground before condemning the sensor.
Common causes
- Signal wire shorted to ground
- Open circuit or disconnected MAP sensor connector
- Loss of the 5V reference or ground feed to the sensor
- Corroded, damaged, or water-intruded connector
- Internally failed MAP sensor
- Disconnected or leaking sensor vacuum supply on ported designs
Symptoms
- Check engine light on
- Reduced power or hesitation
- Rough idle or stalling
- Poor fuel economy or rich/lean running
- Hard starting in some cases
Diagnostic steps
- 1.Scan and record all codes; note companion sensor or reference-voltage codes.
- 2.Inspect the MAP sensor connector for damage, corrosion, and full seating.
- 3.With the key on, check for the 5V reference and a good ground at the sensor connector.
- 4.Check the signal wire for a short to ground and for continuity back to the ECM.
- 5.Compare live MAP voltage/pressure against a known-good spec at key-on and idle.
- 6.If power, ground, reference, and wiring are good but the signal stays low, replace the MAP sensor and re-verify.
Repair cost
$40 – $350
The MAP sensor itself is inexpensive (parts often $15-$120) with minimal labor, so a sensor replacement is commonly $60-$180. A wiring or connector repair depends on access and the extent of the damage. Verify the wiring and reference voltage before replacing the sensor.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with map sensor replacement preselected. Adjust labor rate and vehicle category to fit your situation.
Related repairs
DIY vs shop
This is an intermediate DIY job. It usually involves diagnostic steps, specialty parts, and some careful work in tight spaces. If you have the tools and a service manual or trustworthy video for your specific vehicle, it is achievable in a weekend. Otherwise, a competent independent shop will be faster.