Trouble codes › P0108
P0108 Manifold Absolute Pressure/Barometric Pressure Circuit High
Fuel and air
P0108 means the manifold pressure (MAP) sensor's signal is too high, usually a disconnected vacuum hose, wiring or a failed sensor.
The MAP sensor signal is higher than it should be, as if the intake had no vacuum. It's usually wiring, a disconnected vacuum line or a failed sensor.
Usually drivable, but the engine may run rich or poorly. Get it fixed soon.
Common causes
- A disconnected or cracked vacuum hose to the MAP sensor
- An open ground or signal shorted to voltage
- A failed MAP sensor
- Low engine vacuum from a mechanical problem (less common)
Symptoms
- Rough idle, poor fuel economy
- Black smoke or a fuel smell
- Hesitation
What to check first
- Check the vacuum hose to the sensor if it has one.
- Check the sensor's ground and signal wiring.
- Compare the MAP reading with the engine off (should match barometric pressure) and at idle (should drop well below it).
- Replace the sensor if the wiring and vacuum supply are good.
What does P0108 mean on your vehicle?
The likely cause depends on your engine. iRepair researches your exact year, make, model and engine (service bulletins, recalls and owner reports) and tells you what to check first. Your first 3 questions are free.
Ask iRepair about P0108No scanner? Most auto parts stores read check-engine codes for free.
Related codes
General guidance for P0108 on most vehicles. Some makers use the same code a little differently; confirm in the service information for your vehicle, put safety first, and see a professional when in doubt.