P0106: Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance
The MAP sensor, which reads vacuum inside the intake manifold, is giving readings that do not match what the engine is doing.
What P0106 means
The manifold absolute pressure sensor measures the pressure inside the intake manifold. At idle there is strong vacuum; at wide open throttle it is close to outside air pressure. The engine computer uses that reading to calculate engine load, fuel and spark timing. P0106 sets when the reading is erratic or does not agree with throttle position and RPM. RepairPal names a defective sensor, intake vacuum leaks and corroded wiring as the usual causes, and warns that MAP sensors are often replaced when the real problem was a vacuum leak, a stuck open EGR valve or a bad idle air control motor. Shops watch MAP voltage on a scan tool while driving; it should swing from about 1 volt on deceleration to 4 volts or more under hard acceleration. They also check for a steady 5 volt reference and a good ground at the connector. Fix it soon, since bad load data affects fuel mixture and emissions.
Common symptoms
- Check engine light on
- Hard starting
- Poor fuel economy
- Rough idle or hesitation
- Noticeably weak performance in some cases
Most common causes
- Faulty MAP sensor
- Vacuum leak at the intake manifold
- Cracked or plugged MAP sensor vacuum hose
- Corroded or loose sensor wiring
- EGR valve stuck open
- Idle air control problem causing a very low idle
What to check yourself first
Find the MAP sensor on the intake manifold and check its vacuum hose, if it has one, for cracks or softness. Make sure the connector is tight. With a scan tool, key on and engine off, the MAP and barometric readings should match the outside air pressure.
Typical fixes and what they cost
| Fix | Typical cost | Note |
|---|---|---|
| Replace MAP sensor | $201-$242 | When the sensor fails a vacuum and voltage test. |
| Smoke test for intake leaks | $61-$90 | RepairPal lists an intake leak as the most common reason a good MAP sensor gets replaced. |
| Replace EGR valve | $489-$632 | If the EGR valve is stuck open and upsetting manifold pressure. |
| Electrical diagnosis to find a wiring or connector fault | $122-$179 | For loose or corroded MAP sensor connections. |
Typical US price ranges for parts and labor, not quotes. Your shop should confirm the cause with a diagnostic before replacing parts.
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