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I've got a '03 cadillac dts 4.6L northstar in here and i…

Second opinion] Hey man, I've...
Second opinion] Hey man, I've got a '03 cadillac dts 4.6L northstar in here and i have a fuel level sensor code. Voltage too high. i know via wiring diagram that the purple wire is the signal wire from the sending unit to the pcm. However, i have 5 volts on said signal wire. i went straight to the pcm and cut the signal wire just before the pcm C2 connector and i still have 5 volts {reference voltage} coming out of the pcm. with the exception of the pcm being internally shorted im out of ideas.
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Answered in 1 hour by:
10/18/2017
KALAMYKID
KALAMYKID, Shop Owner/ Tech
Category: Cadillac
Satisfied Customers: 5,493
Experience: I HAVE OWNED MY OWN SHOP FOR OVER THREE YEARS. I HAVE THE TOOLS AND SOFTWARE TO ANSWERE ALMOST ANY Q
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If you have this code, most often the code is set due to the sending unit is faulty. The pcm sees the voltage is still 5 volts, and not dropping due to the sending unit not applying a ground to it. This control is only 5 volt system, so the pcm is sending the correct voltage, it just is not getting a ground from the sending unit itself.

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Customer reply replied 9 months ago
i ohmed out the variable resistor and found the problem. thanks anyway though.

You can replace just the sending unit and not the whole fuel pump.

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Customer reply replied 9 months ago
i don't think so, the sending unit is wired in with the pump so they will not sell it seperate.

Gm sells just the sending unit.

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Customer reply replied 9 months ago
yea, but is the cost of the sending unit from the dealer cheaper than the cost of the whole module in the aftermarket?

The last one I got was $40.00. That is much better then $300 for a whole pump.

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Customer reply replied 9 months ago
35$ from the local boneyard

That is not bad, compared to a new pump.

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Customer reply replied 9 months ago
i wish i had more options but my resources are a little limited. i would much rather put a new module from the dealer in...

Some times you have to do what you have to do. Money is tight for every one so I understand.

KALAMYKID
KALAMYKID, Shop Owner/ Tech
Category: Cadillac
Satisfied Customers: 5,493
Experience: I HAVE OWNED MY OWN SHOP FOR OVER THREE YEARS. I HAVE THE TOOLS AND SOFTWARE TO ANSWERE ALMOST ANY Q
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