Hi Scotty,
Please, I need your help. (2010 Hyundai Sonata 4 cyl - Auto, Mileage 240,569)
My fuel pump went out and I had it replace with a new one. I purchased a fuel pump assembly and had it installed, basically to remove the old one and replace with the new one. The new one included a fuel level sensor. My fuel pump sensor already went out and I assumed with the new one which included a new fuel sensor would make my fuel gauge work properly again.
However, I still have P0462 Code - Fuel Level Sensor "A" Circuit Low Input - Still not working after Replaced Fuel Pump Assembly
What else can it be causing this issue?
I am thinking maybe a fuse (how many fuse(s) related to the fuel pump?
My engine light is one whereas before it was not. I replaced my fuel cap.
Is it required to fix it?
Will it create any issues if I don't?
Please advise.
I dare you have some type of a wiring problem if you got a good fuel pump assembly if you bought a cheap aftermarket one made in China that's a big mistake as they will often not work correctly
It's not required to fix it as long as you don't have vehicle inspection which require that the CEL isn't illuminated.
Also, it's not a fuse.
You have to look at this from where the computer is looking at this.
Here's the circuit
The computer is monitoring the voltage where that Blue dot is between its internal fixed resistor and the fuel senders resistor.
The resistance of the fuel level sender changes as the float in the fuel tank moves.
Full Tank = Less Resistance
Empty tank = More Resistance
Computers like to use 5 volts so let's say the computer is providing 5 volts on that Fuel Level Signal wire.
From its monitoring point in the circuit (blue dot), and taking it to the extremes it should never read 5 volts and it should never read 0 volts.
An easy way to remember how it's monitoring the voltage on this circuit is:
Lower Resistance = Lower Voltage
Higher Resistance = Higher Voltage
You don't have to concern yourself with the reasons for high voltage because that would be a P0463 Fuel Level Sensor “A” Circuit High.
You have a P0462 Fuel Level Sensor “A” Circuit Low.
A good starting point may be to hook up a scanner and observe the Fuel Level voltage.
If the voltage is 0, it's likely that the Fuel Level Signal wire is shorted to Ground somewhere or the sensor is.
Remember, from the position in this circuit where the computer is monitoring the voltage (blue dot), Lower Resistance = Lower Voltage and a short to ground would be 0 Resistance which would equal 0 Voltage.
So where is the short to ground? Is it the wiring or that new fuel level sensor on that new fuel pump module?
Since you have no way of knowing how much fuel is in the gas tank and the fact that the resistance is lowest at Full, maybe go fill up the fuel tank and check the resistance.
Disconnect the wiring connector at the fuel pump. The connector on the fuel pump will be one of these.
It will look like this as you probe the terminals
Then compare your reading at Tank Full to the specification chart.
If that looks good then it's the Fuel Level Signal wire shorting to ground somewhere.
So I know I just took 5 minutes to explain what Scotty just told you in 5 seconds.
I'm retired. I have more time on my hands.
