Code P0463 fuel level sensor A circuit high

JORGE C

MEMBER
2005 INFINITI G35
3.5L
V6
2WD
AUTOMATIC
134,000 MILES

Starting off by saying gas gauge also stuck under E. So I Googled it and said possibly fuel pump and sending unit but they look good to me. I cleaned the pins but they weren’t dirty. Pump isn’t yellow from being old either so I feel like that isn’t the problem. All fuses are good as well. I have read threads about the problem and one problem said it could b the cluster messed up. I turn the car to on and I can hear the pump make a vibration noise. The needle moves up a little bit also but stays on or under E. So I don’t know if I should replace fuel pump and sending unit or cluster or I’m not sure.

1 Reply

JACOBANDNICKOLAS

MECHANIC
109,700 POSTS

Hi,

The code indicates there is low voltage from the level sensor circuit. Take a look at the attached pic. It indicates possible causes. Honestly, the code doesn't tie into the instrument cluster.

I don't know if you have a scan tool which can perform the test, but here is a diagnostic flow chart related to the code:

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2005 Infiniti G35 Sedan 2WD V6-3.5L (VQ35DE)
P0463
Vehicle ALL Diagnostic Trouble Codes ( DTC ) Testing and Inspection P Code Charts P0463
P0463
DTC P0463 FUEL LEVEL SENSOR

Component Description

pic 2

The fuel level sensor is mounted in the fuel level sensor unit. The sensor detects a fuel level in the fuel tank and transmits a signal to the combination meter. The combination meter sends the fuel level sensor signal to the ECM through CAN communication line.

It consists of two parts, one is mechanical float and the other is variable resistor. Fuel level sensor output voltage changes depending on the movement of the fuel mechanical float.

Pic 3

On Board Diagnosis Logic

NOTE: If DTC P0462 or P0463 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC U1000, U1001. Refer to EC-166, "DTC U1000, U1001 CAN COMMUNICATION LINE". See: A L L Diagnostic Trouble Codes ( DTC ) > U Code Charts > Engine Control System

This diagnosis indicates the former, to detect open or short circuit malfunction.

DTC Confirmation Procedure

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 V at ignition switch ON.

WITH CONSULT-II
1. Turn ignition switch ON.

Pic 4

2. Select "DATA MONITOR" mode with CONSULT-II.
3. Wait at least 5 seconds.
4. If 1st trip DTC is detected, go to "Diagnostic Procedure".

WITH GST
Follow the procedure "WITH CONSULT-II" above.

Diagnostic Procedure

pic 5

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If you have a digital multi meter, the last two pics show what resistance should be based on level location. You could use that information to check the level sensor's rheostat.

Let me know if any of this helps or if you have other questions.

Take care,
Joe

Images (Click to make bigger)

Code P0463 fuel level sensor A circuit high

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