P0106: MAP/BARO Sensor Range/Performance Problem
The P0106 code indicates that the Engine Control Module (ECM) has detected a signal from the Manifold Absolute Pressure (MAP) or Barometric Pressure (BARO) sensor that is outside the expected range or not performing correctly. This can be due to a faulty sensor, vacuum leaks, wiring issues, or a clogged MAP sensor port. The ECM uses this sensor to monitor engine load and adjust fuel delivery and ignition timing, so an inaccurate reading can cause drivability problems.
1. Most Common Causes
- Faulty MAP or BARO sensor
- Vacuum leak in intake manifold or hoses
- Wiring or connector issues (corrosion, damage)
- Clogged MAP sensor port or hose
- ECM software or hardware failure (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Poor engine performance (hesitation, stalling)
- Rough idle or misfire
- Decreased fuel economy
- Failed emissions test
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect MAP sensor, wiring, and vacuum hoses for damage or disconnection.
Step 3: Test MAP sensor signal with a scan tool or multimeter; compare to expected values (e.g., ~1.5V at idle, ~4.5V at WOT).
Step 4: Check for vacuum leaks using a smoke machine or propane enrichment.
Step 5: If sensor and wiring are OK, replace the MAP sensor and clear codes.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally not recommended to drive long distances with P0106, as it can cause poor 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 diagnose and repair P0106 typically ranges from $50 to $150 for parts and labor, depending on the cause. A MAP sensor replacement costs around $30-$100 for the part plus labor.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.