P0108
Manifold Absolute Pressure/Barometric Pressure Sensor Circuit High
Fuel & air metering
Generic OBD-II
High
What it means
P0108 means the manifold absolute pressure (MAP) sensor circuit is reading a higher-than-expected voltage, so the ECM sees an implausible pressure value. Since it uses that reading to calculate load, fuel, and timing, a bad signal causes hesitation, rough running, and poor economy. It's typically a failed sensor or a wiring fault rather than a mechanical engine problem.
High
Can I keep driving? Drivable but degraded — the ECM uses the MAP signal to set fuel and timing, so expect hesitation, poor economy, and rough running until it's fixed.
Common symptoms
What you'll notice
- Check-engine light on
- Hesitation or stumbling under acceleration
- Rough running and reduced power
- Poor fuel economy
Common causes
Most likely first
- Failed MAP/BARO sensor reading highLikely
- Short to voltage or open in the sensor signal wiringCommon
- Corroded or loose sensor connectorCommon
- Failed engine control module (rare)Less often
How to diagnose & fix
Work through it in order
- Read the live MAP value and compare it against barometric pressure at key-on, engine-off — a stuck-high reading confirms the fault.
- Inspect the sensor connector and wiring for damage, corrosion, or a short to a voltage source.
- Check the sensor's vacuum port/hose (where fitted) for blockage or disconnection.
- Replace the MAP sensor if the circuit checks good. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0108?+
The car will usually still drive, but a wrong MAP reading skews the fuel mixture, causing hesitation and poor economy — and in severe cases rough idle — so fix it before long trips.
Can I just clear P0108?+
It will return once the ECM re-reads the out-of-range signal unless the sensor or wiring is repaired.
Related codes
Often seen with P0108
Read & clear P0108 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX