P0107: MAP/Barometric Pressure Circuit Low Input
The P0107 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the Manifold Absolute Pressure (MAP) sensor or Barometric Pressure (BARO) sensor that is lower than the expected range (typically below 0.2 volts). This can be caused by a faulty sensor, wiring issues, vacuum leaks, or a problem with the ECM. The MAP sensor measures intake manifold pressure to help the ECM calculate fuel delivery and ignition timing. A low input can lead to poor engine performance, increased emissions, and potential drivability issues.
01. Most Common Causes
- Faulty MAP sensor
- Open or short circuit in MAP sensor wiring or connector
- Vacuum leak in intake manifold or hoses
- Faulty ECM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine running rich or lean, rough idle, hesitation, or stalling
- Poor fuel economy
- Hard starting or no start condition
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to verify the code and check freeze frame data.
Step 2: Inspect the MAP sensor connector and wiring for damage, corrosion, or loose connections.
Step 3: Test the MAP sensor voltage with a multimeter: key on engine off should read around 4.5-5V reference, signal wire should be 4.5-5V at sea level; with engine running, signal should drop to 1-2V at idle.
Step 4: Check for vacuum leaks using a smoke machine or propane enrichment method.
Step 5: If sensor and wiring are okay, replace the MAP sensor and clear the code.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with P0107 as it can cause poor engine performance, stalling, and potential damage to the catalytic converter due to incorrect air-fuel mixture.
How much does it cost to fix?▼
The cost to fix P0107 typically ranges from $50 to $150, including parts (MAP sensor $30-$80) and labor ($20-$70).