DTC P0464: Fuel Level Sensor Circuit Intermittent: Condition

WARNING: This page is about a different car, the 2002 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.

DTC P0464 is set when fuel level sensor output signal noise levels out of specification while engine is running. MIL is illuminated when ECM (PCM) detects malfunction during 2 consecutive drive cycles. Possible causes are:

Tank pressure sensor malfunction.
Tank pressure sensor circuit malfunction.
ECM (PCM) malfunction.