Code Definition

P0108 — Manifold Absolute Pressure/Barometric Pressure Circuit High Input

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0108

P0108 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0108 is stored, the module has detected a signal or supply voltage higher than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0108 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0108 code indicates a high input condition in the circuit of the Manifold Absolute Pressure (MAP) sensor or the Barometric Pressure sensor. These sensors are crucial for measuring the pressure within the intake manifold and the ambient air pressure, respectively. The data from these sensors is used by the Engine Control Module (ECM) to optimise fuel delivery and ignition timing. A high input signal could indicate that the pressure reading is higher than normal, potentially leading to issues like poor engine performance, increased emissions, and decreased fuel efficiency.

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