P0105 - Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction
The P0105 code indicates a malfunction in the Manifold Absolute Pressure (MAP) or Barometric Pressure (BARO) sensor circuit. The Engine Control Module (ECM) detects that the voltage signal from the MAP/BARO sensor is outside the expected range or missing. This sensor measures intake manifold pressure to calculate air density and fuel delivery. A faulty sensor, wiring issues, or vacuum leaks can trigger this code.
01. Most Common Causes
- Faulty MAP/BARO sensor
- Open or shorted wiring in sensor circuit
- Poor electrical connection at sensor
- Vacuum leak in intake manifold
- ECM failure (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine running rough or misfiring
- Poor acceleration or hesitation
- Increased fuel consumption
- Black smoke from exhaust (rich mixture)
03. Step-by-Step Diagnosis
Step 1: Use OBD2 scanner to confirm P0105 and check freeze frame data.
Step 2: Visually inspect MAP sensor connector and wiring for damage or corrosion.
Step 3: Test MAP sensor voltage with a multimeter (key on, engine off: ~4.5-5V reference, signal varies with vacuum).
Step 4: Check for vacuum leaks using smoke machine or propane enrichment.
Step 5: If sensor and wiring are okay, replace MAP sensor and clear 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 as the engine may run poorly, causing stalling or reduced power. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for a MAP sensor replacement, including parts and labor. Diagnostic fees may add $50-$100.