Code Definition

P1186 — FTS Low - Fuel Pump Temperature Sensor Low

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

About P1186

P1186 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 P1186 is stored, the module has detected a signal or supply voltage lower than the expected operating range; 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.

P1186 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

The Engine Control Module (ECM) monitors the fuel pump temperature sensor (FTS) to assess fuel pump operating temperature for system protection. DTC P1186 is set when the ECM detects a voltage signal from the fuel pump temperature sensor that is below the calibrated minimum threshold, indicating an implausibly low temperature reading. This condition is typically caused by a short to ground, an open signal circuit, or a sensor fault resulting in a low or missing temperature input.

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