Code Definition

P1186 — Fuel Pump Temperature Sensor low

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

About P1186

P1186 is a manufacturer-specific powertrain diagnostic trouble code recorded for Ford vehicles. 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

This code applies to Ford diesel engines with the Lucas EPIC injection pump, which carries a fuel temperature sensor so the control module can compensate fuel delivery for fuel density as temperature changes. DTC P1186 sets when the fuel pump temperature sensor signal is low, meaning the voltage is at the lower end of its range and the reported value is outside the expected window. On a thermistor circuit a low signal usually corresponds to a short to ground in the wiring or sensor, though a genuinely high fuel temperature can also drive the signal low depending on the sensor characteristic. W...

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