P0108: Manifold absolute pressure sensor input high
Drive carefully. Get it checked within a week or two.
Can I drive with P0108?
Yes, but drive carefully and get it checked soon. The sensor reports abnormal engine vacuum, causing excessively rich fuel injection and soot.
What does P0108 mean?
P0108 stands for Manifold Absolute Pressure/Barometric Pressure Circuit High Input.
Symptoms you may notice
- Engine hesitates or jerks when stepping on the gas
- Rough, unsteady idle at stoplights
- Reduced engine power and delayed gear shifts
How much does it cost to fix?
Repair costs for code P0108 depend on the specific underlying root cause, ranging from simple DIY checks to component replacement. The table below lists the most common causes and rough price ranges in USD:
- Severed vacuum hose to the MAP sensor
- Short to 12V or 5V power in signal harness
- Internal failure of the MAP sensor
- Major intake manifold leak or cracked plenum
What to do next
- Confirm the vacuum supply hose is securely connected to the sensor nipple.
- Check for burned wiring or damaged sensor pigtail.
- Read live scanner data to verify if MAP voltage drops when engine starts.
Last updated: October 2026
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General guidance only, not a professional diagnosis. If the check-engine light is flashing, or the car is running rough, overheating or losing power, stop driving and get help.
About this code
P0108 indicates high voltage (usually over 4.5 volts), signaling no vacuum. If the vacuum hose simply popped off, the sensor reads atmospheric pressure all the time. Reconnecting the hose or swapping a failed sensor usually clears the check engine light quickly.