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 that is lower than the expected range (typically below 0.2V). This sensor measures intake manifold pressure to calculate air density for fuel delivery. A low input can result from a faulty sensor, wiring issues (short to ground, open circuit), vacuum leaks, or a clogged MAP sensor port. This condition often leads to incorrect air-fuel mixture, causing performance issues.
1. Most Common Causes
- Faulty MAP sensor
- Open or shorted MAP sensor wiring
- Vacuum leak in intake manifold
- Clogged MAP sensor port or hose
- Faulty ECM (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine hesitation or rough idle
- Poor acceleration or stalling
- Black smoke from exhaust (rich mixture)
- Decreased fuel economy
3. Step-by-Step Diagnosis
Step 1: Connect OBD2 scanner and verify code P0107. Check freeze frame data.
Step 2: Visually inspect MAP sensor connector and wiring for damage, corrosion, or loose connections.
Step 3: Test MAP sensor voltage with a multimeter: key on engine off should read ~4.5-5V reference, signal wire should be ~4.5-5V (atmospheric pressure).
Step 4: Check for vacuum leaks using smoke machine or propane enrichment test.
Step 5: If sensor and wiring are good, replace MAP sensor and clear code.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the engine may run poorly, stall, or cause further damage. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on the vehicle and shop rates. DIY replacement of the MAP sensor costs around $20-$80 for the part.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.