Code Definition

P1168 — Fuel Rail Sensor In-Range Low Failure

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

About P1168

P1168 is a manufacturer-specific powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1168 is stored, the module has detected a signal or supply voltage lower than the expected operating range; a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour; and a sensor-related fault — the reported value from the named sensor is out of spec.

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.

P1168 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 code sets when the powertrain control module (PCM) detects that the fuel rail pressure sensor (FRPS) is providing a signal that is within the expected range but lower than the normal operating parameters. This may indicate a fuel delivery issue or a failing sensor, which can cause drivability problems such as poor acceleration or engine hesitation.

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