robbclark1

Hello all. I was wondering if any of you knew anything about these problems. I've done some searching on this site as well as other sites.

Car: 2003 GXE auto

Problem: Threw some codes
U1001 - CAN communications
P0462 - Fuel Level Sensor Circuit Low Input
P0463 - Fuel Level Sensor Circuit High Input

The car is having some difficulties starting and sometimes when it does start, it stutters and feels like it is going to stall. This problem is intermittent, but has been a problem for a few months now (it just threw the code). I had the code erased, but the car is still having problems starting. It probably isn't IAC because the car runs fine once it starts.

I did some searching and I came across a few answers to this problem. Can anyone help?

1) I need a ECU update
2) Fuel sensor is bad or there is a short circuit
3) Fuel sensor is stuck in an open position

http://www.b15sentra.net/forums/show...ighlight=p0462
http://www.b15sentra.net/forums/show...ighlight=p0462
http://www.b15sentra.net/forums/show...ighlight=p0462

Which one should I attack first? I'd rather not take it to the dealer because they will rape me on $$ and probably not believe me that I know WTF I am talking about.

Thanks

robbclark1

anyone?? Please help.

guyinmaryland

I have the same error code that I got from Autozone. I took the car to the dealer today who told me they don't take other peoples codes that I'd have to pay for theirs. Fine. I figured it was worth the chance.


They came back and said that I had a blown head gasket.

I have the same exact problem that you are having. I doubt very seriously it's a blown head gasket but also don't know for sure.

I know this doesn't help your particular situation but I too am wondering what is the best course of action to fix this without using the dealership?

robbclark1

those codes have nothing to do with the headgasket. They are for the fuel system. I erased the code and it hasn't come back. Still have minor problems starting though.

guyinmaryland

Yeah, I realize that now. Since my first post about 4 hours ago or so, the light is back off again.

I don't know how to take care of the rough start problem though.

metro273

The fuel pump assembly needs replacing! That's why you are getting the 2 fuel codes. There is a ball-bearing in the fuel pump that isn't holding fuel pressure, so when you try to start the car, it has to fill up with gas before it starts, thus the long crank time! Replacing the entire assembly will remedy your problem.
Btw, don't forget to buy the fuel pump o-ring!

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