P0106 Code: Manifold Absolute Pressure/BARO Sensor Range/Performance
Quick Answer
The manifold absolute pressure sensor is sending readings that don't match what the ECU expects for current engine conditions.
At a Glance
What this code means
The MAP (manifold absolute pressure) sensor measures the pressure inside the intake manifold, which tells the ECU how much air load is on the engine. P0106 means the signal is within electrical range but implausible — it doesn't match what the ECU expects given throttle position, RPM, and other data. This is a plausibility fault, not a simple out-of-range voltage issue.
Common causes
- Faulty MAP sensor
- Cracked, disconnected, or blocked vacuum line to the MAP sensor
- Intake manifold vacuum leak causing unusual pressure readings
- Carbon buildup in the MAP sensor port restricting pressure sensing
- Damaged MAP sensor wiring or connector
Symptoms you might notice
- Rough idle or surging
- Hesitation or stumbling under acceleration
- Poor fuel economy
- Check engine light on
- Possible fuel trim codes alongside P0106
Can you still drive?
With caution. The engine can run but fuel delivery and ignition timing may be off, causing rough running and potentially engine stress.
How serious is this code?
Moderate. An inaccurate MAP sensor causes the ECU to miscalculate fuel and timing. Address it within a week.
Before you replace parts
Parts replacement is often not the first step. Before buying anything, it's worth checking these basics:
- Inspect and flex the vacuum hose to the MAP sensor — cracks near the fittings are often only visible when the hose is bent
- Check the MAP sensor port for carbon blockage with a small pick or carburetor cleaner before replacing the sensor
How to troubleshoot it
- Locate the vacuum hose connecting to the MAP sensor and check it for cracks, disconnection, or blockage
- Inspect the MAP sensor port on the intake manifold for carbon buildup — clean with carburetor cleaner if needed
- Check the MAP sensor wiring connector for corrosion or damaged pins
- Use a scan tool to watch live MAP sensor readings at idle and under different loads
- Test the MAP sensor output voltage with a multimeter and compare to spec
- Replace the MAP sensor if confirmed faulty
Tools that may help
These are the types of tools commonly used when diagnosing this code. Having the right tool can save time and help confirm a diagnosis before spending money on parts.
- OBD-II scanner with live data
- Multimeter
- Vacuum pump tester
Estimated repair cost range
MAP sensor replacement: $50–$200 depending on vehicle. Vacuum hose repair: under $20.
Costs vary significantly by vehicle, location, and whether you use OEM or aftermarket parts. These are general ranges for reference only.
When to call a mechanic
If you've completed the basic troubleshooting steps and the code keeps returning, or if you don't have access to the proper diagnostic tools, it's worth consulting a professional. A qualified technician can perform a full diagnosis and confirm the root cause before any parts are purchased. When in doubt, get a professional opinion — it can save you from an expensive misdiagnosis.
Real-world note
Before replacing the MAP sensor, check the vacuum hose — it's a 5-minute inspection and resolves many P0106 codes. The hose cracks near the fittings and can be difficult to see without flexing it.
Informational purposes only. This guide is for educational reference and is not a substitute for diagnosis by a qualified technician. Repair costs, causes, and symptoms may vary by vehicle make, model, year, and condition. Always consult a licensed mechanic before performing major repairs.