Thread: P0463 Fuel Level Sensor Circuit High Voltage = ECM, PCM code

So...the float is bad?

I'd yank the pump out and see what's up there...other than that...I'm not really sure...never ran into this problem and I've had everything ELSE go wrong with my car since I've owned it.

its not really a float.

Circuit Description

The fuel level sensor changes resistance based on fuel level. The PCM monitors the signal circuit of the fuel level sensor in order to determine fuel level. When the fuel tank is full, the sensor resistance is high and the PCM senses a high signal voltage. When the fuel tank is empty, the sensor resistance is low and the PCM senses a low signal voltage. The PCM uses the signal circuit of the fuel level sensor in order to calculate the total remaining fuel percent in the tank. The PCM sends the fuel level percent via the class 2 serial data circuit to the IPC in order to control the fuel gage. The fuel level information is also used for misfire and EVAP diagnostics.

its hard to say weather or not you should change the hole fuel pump or just the sending unit.