P0463 Fault Code

Long Description

Fault code P0463 is logged when the powertrain control module (PCM) has detected an issue with the fuel level sensor circuit. This code specifically relates to the PCM reading a voltage that is higher than the actual maximum fuel level in the gas tank.

The fuel level sensor is a system used to determine how much fuel there is in the fuel tank. It has predetermined maximum and minimum voltages, which correspond to a completely full or completely empty tank respectively.

Without this information, it is impossible to accurately determine how much fuel is present in the fuel tank. This can lead to the vehicle running out of fuel unexpectedly.

Fault code P0463 represents a low voltage condition for the fuel level sensor circuit.

This code is possible in any vehicle, but manufacturers like Jeep, Dodge, and Chevrolet are among the most commonly reported.

Other Signs of This Problem

There are relatively few additional signs for this type of fault code. The presence of the Check Engine light and subsequent fault codes are some of the easiest ways to determine if there is an issue.

It is possible that the fuel gauge on the dashboard will fluctuate randomly as the signal is constantly changing. Additionally, it could read full or empty despite the fuel tank being only somewhat filled.

Similarly, the fuel light may illuminate itself somewhat randomly and lead to this P0463 fault code appearing.

Be sure to look out for other fuel tank level sensor fault codes like P0460, P0461, and P0464.

What Could Be The Problem?

There are various potential causes for a high input signal from the fuel level sensor. These can be both mechanical and electrical in nature. However, the majority of these potential situations are electrical faults.

A faulty fuel level sensor is a likely cause as it can be sending an erroneous signal to the PCM without there being an actual issue with the fuel system.

There also may be an issue with the grounding in the fuel level sensor circuit.

Other electrical components like the gauge cluster or fuel sensor harness can also cause this P0463 issue.

Mechanical faults like a damaged or faulty fuel tank, fuel pump, or fuel level sensor float can also be the cause of this fault code.

Fixes

It is important to replace any damaged or faulty parts within the fuel system that could cause this fault code.

One of the first parts to check is the fuel level sensor. If this is faulty in any way, it should be replaced. However, this sensor is integral to the fuel pump module in some vehicles. This means both these parts will need to be replaced if necessary.

Any damage to the fuel tank or fuel lines should also be fixed accordingly.

The wiring and connections between the fuel sensor harness and gauge cluster should be repaired if there is any damage or fraying.

Seriousness

Fault code P0463 can be considered low to moderate in terms of seriousness. There is no risk of damage to the vehicle or its occupants in the case of a petrol engine.

In the case of a diesel engine, it is more serious as running out of fuel can cause damage to the fuel pump and injectors.

This means a diesel vehicle exhibiting this fault code should be fixed as soon as possible. A petrol engine can typically afford to wait a few days.