Code Definition

P1107 — MAP Circuit Intermittent Voltage Low

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

About P1107

P1107 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 P1107 is stored, the module has detected a signal or supply voltage lower 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.

P1107 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 Manifold Absolute Pressure (MAP) sensor is intermittently reporting a voltage lower than the expected range. The MAP sensor measures intake manifold pressure and outputs a voltage that falls as vacuum increases, and the Engine Control Module (ECM) relies on this signal to calculate engine load, fuelling, and spark timing. This code sets when the ECM detects sporadic low voltage readings, which typically point to a brief short to ground, an intermittent loss of the 5V reference, an open signal wire, or an internally faulty sensor. The resulting incorrect load calcu...

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