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.

Real-world scan data

Seen in

4,341

scans in the past year

Found in

0.7%

of scans

1.2%

of scans that found faults

Appears alongside · share of P0108 scans

P0113in 28.9% of scans

P0123in 21.1% of scans

P0118in 12.0% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

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.

Read & clear P0108 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX