P0182 indicates the Powertrain Control Module (PCM) detected a fuel temperature sensor circuit voltage reading lower than the expected range. The fuel temperature sensor, typically a thermistor located in the fuel tank or fuel line, changes resistance with temperature. When the circuit reads abnormally low (often indicating a short to ground or the sensor reading an unrealistically high temperature), this code sets and may affect fuel delivery calculations.
The sensor internally shorts or its resistance drops below normal operating range, causing the circuit to read continuously low.
The sensor wiring harness, often routed near the fuel tank, becomes damaged and shorts to chassis ground, pulling the signal low.
Moisture intrusion and corrosion at the fuel temperature sensor connector or PCM connection creates a short or high-resistance connection.
On some vehicles, very low fuel levels leave the sensor exposed to air rather than fuel, causing abnormal temperature readings.
On rare occasions, a faulty ECT sensor sharing the same ground circuit can pull the fuel temp sensor circuit low.
The PCM itself may have an internal circuit fault affecting the fuel temperature sensor input, but this is the least likely cause and should be diagnosed last.
No. While some may suggest replacing the PCM, this is rarely the cause of P0182. The fuel temperature sensor, its wiring, or connectors are the root cause in the vast majority of cases. PCM failure for this specific code is extremely uncommon.
You can typically drive short distances, but the code indicates the fuel temperature signal is inaccurate, which can affect fuel delivery calculations. It should be diagnosed and repaired promptly to avoid drivability issues.
In most vehicles, it is integrated into the fuel pump module inside the fuel tank. Some older or specific vehicles may have it mounted in the fuel rail or fuel line.
Yes, in most regions a lit Check Engine Light (including P0182) will cause a vehicle to fail an emissions test. The code should be cleared after proper repair before testing.