P0108
Manifold Absolute Pressure Sensor High Input
The MAP sensor reports a pressure above the upper threshold the ECU expects in any engine state. Typically caused by a short in the signal circuit or a sensor that has failed producing a fixed high output.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Signal wire shorted to supply voltageCommon
- MAP sensor failedPossible
- Sensor ground brokenLess likely
Parts involved
- MAP Sensor
- MAP Sensor Wiring
P0108 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.