P1186 Fuel Pump Temperature Sensor Low (Diesel)

Category: Powertrain - Fuel/Air Metering
Severity: Check Engine Light
Applies to: F-250/F-350 Super Duty diesel models

What does P1186 mean on a Ford?

P1186 — Fuel Pump Temperature Sensor Low (Diesel). This Ford-enhanced code applies to F-250/F-350 Super Duty diesel models.

Common causes of P1186

Open pump temperature circuit
Failed sensor reading low
Damaged wiring
Connector corrosion
Module reference fault

How to fix P1186

Test circuit continuity
Measure sensor resistance
Inspect the connector
Repair wiring faults
Replace the sensor if the circuit is intact