Code P0462

[Shaun Perry]

Possible Causes:
1. Faulty Fuel Level Sensor
2. Fuel Level Sensor Harness is open or shorted
3. Fuel Level Sensor Circuit poor electrical connection

This thread is more so pointed toward any of you who have experienced getting this code, and actually had to take action on it because the code kept coming back. I'm interested to hear what steps you guys took, and in what order, to resolve the problem.

Today is Saturday, sometime around Tuesday I filled up my tank(91 octane), from a pretty low empty tank. I noticed the CEL, checked the code with my OFT, saw the P0462, erased it and went on with life. The next morning, cold start, I start the car and notice the code again. This morning, cold start, before heading into work, I notice the code again.

Starting to feel I might need to start looking at what needs to be replaced, and it's pretty annoying when I erase the code with my tablet, turn off, turn back on, and my car gets that "dead gas pedal", weak RPM, roll to a stop, go into neutral and the car turns off sensation. Those symptoms of having wiped a code and re-setting the ECU.

Any help is appreciated,

Thanks in advance.

Shaun

[chriswian]

What do you think cause this to happen?
I have a bad habit of driving when my low gas light comes on :/ I hope your issue can be resolved easily

[HapaHaole]

Here is what Toyota says for this code.

P0462
Fuel sender gauge assembly voltage is less than 0.4 V for 2.5 seconds or more.
(2 trip detection logic)

P0462, P0463
If an open or short in the fuel sender gauge signal line is detected, the ECM interprets this as a malfunction in the fuel sender gauge, and stores the DTC.

P0462
Fuel sender gauge voltage (Fuel level)
Less than 0.4 V (100.7%)

Connect the Techstream to the DLC3.
Turn the ignition switch to ON and turn the Techstream on.
Clear DTCs (even if no DTCs are stored, perform the clear DTC operation) 2014 MY FR-S [07/2013 - ]; FA20 ENGINE CONTROL: SFI SYSTEM: DTC CHECK / CLEAR .
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON and turn the Techstream on.
Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher .
With the vehicle stationary, depress the accelerator pedal and maintain an engine speed of between 2500 and 3000 rpm for 40 seconds or more [A].
Drive the vehicle at 10 km/h (6.25 mph) or more for 1 minute or more [B].
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.

Enter the following menus: Powertrain / Engine / Trouble Codes.
Read pending DTCs.
HINT:
If a pending DTC is output, the system is malfunctioning.
If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P462 or P0463.
Check the DTC judgment result.
TECHSTREAM DISPLAY
DESCRIPTION
NORMAL
DTC judgment completed
System normal
ABNORMAL
DTC judgment completed
System abnormal
INCOMPLETE
DTC judgment not completed
Perform driving pattern after confirming DTC enabling conditions
N/A
Unable to perform DTC judgment
Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
HINT:
If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
If the test result is INCOMPLETE or N/A and no DTC is output, perform a universal trip and check for permanent DTCs 2014 MY FR-S [07/2013 - ]; FA20 ENGINE CONTROL: SFI SYSTEM: DTC CHECK / CLEAR .
HINT:
If a permanent DTC is output, the system is malfunctioning.
If no permanent DTC is output, the system is normal.

[Shaun Perry]

I wish I could do all this but I don't have techstream.

Thank you though for the info

[HapaHaole]

From what it states, the issue is the signal from the cluster to the ECU is the problem. Could be an issue with either the cluster or sending unit. is it out of warranty?

[Shaun Perry]

99% sure I'm out of warranty I will call tomorrow and double check.

When you say "sending unit" can you show me a link with a picture of what it looks like or part number so I have it for reference if it ends up needing to be replaced and I can anticipate what I have to buy.

[HapaHaole]

Originally Posted by Shaun Perry

99% sure I'm out of warranty I will call tomorrow and double check.

When you say "sending unit" can you show me a link with a picture of what it looks like or part number so I have it for reference if it ends up needing to be replaced and I can anticipate what I have to buy.

Based on the code, its an issue between the gauge cluster and the ECU. But it can be the sending unit, which is in the fuel tank, you will need to test to verify.

[Shaun Perry]

Originally Posted by HapaHaole

Based on the code, its an issue between the gauge cluster and the ECU. But it can be the sending unit, which is in the fuel tank, you will need to test to verify.

Techstream will be the only 100% way to find out which it is exactly?

I work at a Lexus dealership and I guess if I need to pay the employee rate to have a tech diagnose for me I will do so.

[HapaHaole]

Originally Posted by Shaun Perry

Techstream will be the only 100% way to find out which it is exactly?

I work at a Lexus dealership and I guess if I need to pay the employee rate to have a tech diagnose for me I will do so.

What!! I would ask one of the guys to help you out. I use to do it all the time at the dealership.