The engine control module has detected an intermittent signal from the Fuel Temperature Sensor B. This typically indicates that the voltage from the sensor is fluctuating outside of the expected range or the circuit is momentarily losing connection.
Internal failure or an intermittent open circuit within the sensor element itself.
Frayed, pinched, or chafed wires causing a momentary short to ground or open circuit.
Moisture or debris in the connector pins leading to poor electrical contact.
The sensor or the harness connector is not fully seated or locked into place.
An internal fault in the engine control module's processing circuit for the sensor.
Generally, no. The vehicle may operate normally, though fuel density calculations may be slightly inaccurate.
No. P0189 is almost always caused by the sensor or the wiring; PCM failure is extremely rare for this specific circuit.
No, a fuel filter affects fuel pressure and flow, not the electrical signal of the temperature sensor.