Code Definition

P1108 — Barometric Pressure Circuit Input High

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Isuzu

About P1108

P1108 is a manufacturer-specific powertrain diagnostic trouble code recorded for Isuzu vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1108 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.

P1108 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

This Isuzu code indicates the Barometric Pressure (BARO) sensor is reporting a voltage higher than the expected range. The BARO sensor measures atmospheric pressure, allowing the Engine Control Module (ECM) to compensate fuel delivery and ignition timing for altitude, and on many engines this value is derived from the same pressure sensor used to read manifold pressure. This code sets when the ECM sees a BARO signal above the normal range, typically caused by a short to power or reference, or a lost sensor ground. The incorrect altitude reference can lead to a rich or lean mixture, reduced per...

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